【光学】光子晶体波导的二维FDTD附matlab代码

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光子晶体 (Photonic Crystal, PhC) 作为一种新型光学材料,因其能够通过周期性结构调控光波传播特性而备受关注。其独特的能带结构使得光子晶体波导能够实现光波的局域、引导和操控,在集成光学、光子器件等领域展现出巨大的应用潜力。然而,光子晶体的结构复杂性使得对其光学性质的精确分析成为一项挑战。有限差分时域法 (Finite-Difference Time-Domain, FDTD) 作为一种高效的电磁场数值模拟方法,在光子晶体波导特性的研究中得到了广泛应用。本文将重点探讨二维 FDTD 方法在光子晶体波导模拟中的应用,包括其基本原理、数值精度、边界条件处理以及在实际应用中的优势和局限性。

一、二维 FDTD 方法的基本原理

FDTD 方法的基本思想是将麦克斯韦方程组在时域和空域上进行离散化,利用差分方程迭代求解电磁场的时域分布。在二维情况下,我们考虑横电 (TE) 模式或横磁 (TM) 模式,只需求解两个分量即可。对于 TE 模式,我们求解 Ey 和 Hx, Hz 分量;对于 TM 模式,我们求解 Ex, Hz 分量。通过对麦克斯韦旋度方程进行中心差分近似,可以得到如下差分方程:

对于 TE 模式:

  • ∂Ey/∂t = (1/μ)(∂Hz/∂x - ∂Hx/∂z)

  • ∂Hx/∂t = (1/ε)(∂Ey/∂z)

  • ∂Hz/∂t = -(1/ε)(∂Ey/∂x)

对于 TM 模式:

  • ∂Ex/∂t = -(1/ε)(∂Hz/∂y)

  • ∂Hz/∂t = (1/μ)(∂Ex/∂y)

其中,ε 和 μ 分别表示介质的介电常数和磁导率。这些差分方程在空间网格上进行迭代计算,从而得到电磁场在不同时刻的分布。时间步长和空间步长需要满足稳定性条件,以保证数值计算的稳定性和精度。

二、光子晶体波导的二维 FDTD 模拟

在模拟光子晶体波导时,需要首先构建光子晶体的二维结构。这通常涉及到对光子晶体材料的介电常数进行空间离散化,将其表示为一个二维介电常数矩阵。然后,根据波导的几何形状,在该矩阵中定义波导区域和周围的周期性结构。在边界条件处理方面,常用的方法包括周期性边界条件 (PBC) 和完美匹配层 (Perfectly Matched Layer, PML) 边界条件。PBC 用于模拟无限大的周期性结构,而 PML 则用于吸收边界上的反射波,避免边界反射对模拟结果的影响。

三、数值精度和计算效率

二维 FDTD 方法的数值精度取决于空间步长、时间步长以及所采用的差分格式。为了提高精度,可以采用高阶差分格式,或者使用更细密的网格。然而,更高的精度通常意味着更高的计算成本。因此,需要在精度和计算效率之间进行权衡。 光子晶体波导的几何结构复杂,通常需要较细密的网格才能准确模拟其光学特性,这会导致较大的计算量。为了提高计算效率,可以采用一些优化技术,例如局部网格加密、并行计算等。

四、应用实例和局限性

二维 FDTD 方法已成功应用于各种光子晶体波导的模拟,例如光子晶体波导的传输特性、弯曲波导的损耗、光子晶体谐振腔的设计等。 通过模拟,可以得到波导的有效折射率、模式场分布、传输损耗等重要参数,为光子晶体器件的设计和优化提供重要的理论指导。

然而,二维 FDTD 方法也存在一些局限性。首先,它只能模拟二维结构,无法直接模拟三维光子晶体波导。其次,对于具有复杂结构的光子晶体波导,需要非常细密的网格才能保证精度,这会导致计算量急剧增加,甚至超出计算能力的限制。此外,FDTD 方法在处理具有强色散和非线性效应的光子晶体波导时,也可能出现精度下降的问题。

五、总结与展望

二维 FDTD 方法是模拟光子晶体波导的一种有效工具,它能够提供准确的光学特性信息,为光子晶体器件的设计和优化提供重要的理论支撑。 然而,其在处理三维结构和复杂效应方面存在一定的局限性。 未来,结合三维 FDTD 方法、改进的数值算法以及高性能计算技术,将进一步提升光子晶体波导模拟的精度和效率,推动光子晶体技术在更多领域的应用。 同时,结合其他数值方法,例如平面波展开法 (Plane Wave Expansion, PWE) 和有限元法 (Finite Element Method, FEM),可以构建更完善的光子晶体波导研究体系。 这将为未来发展更加高效、高性能的光子器件奠定坚实的基础

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FDTD软件英文使用说明 Initial Properties dialog box ................................................................................... 33 Mask Export............................................................................................................. 41 Profile Designer....................................................................................................... 42 Wafer Properties ..................................................................................................... 42 Profiles In Use ......................................................................................................... 44 Properties ................................................................................................................ 45 Toolbars ................................................................................................................... 45 Status bar................................................................................................................. 45 Color Spectrum ....................................................................................................... 46 Workbook Mode ...................................................................................................... 49 3D Graph Items........................................................................................................ 50 Show slice selector................................................................................................. 54 Refractive Index (X, Y, and Z directions) .............................................................. 54 Zoom tool................................................................................................................. 54 Edit Parameters....................................................................................................... 56 2D Simulation Parameters...................................................................................... 62 3D Simulation Parameters...................................................................................... 66 3D Simulation Parameters for 64-bit simulator .................................................... 68 2D Band Solver Parameters ................................................................................... 73 PWE Band Solver .................................................................................................... 78 Test Script................................................................................................................ 86 Run Script (2D or 3D).............................................................................................. 86 Generate Template Script....................................................................................... 86 Generate Layout Script........................................................................................... 86 Generate Scanning Script ...................................................................................... 86 Preferences menu ................................................................................................... 87 Edit Menu ................................................................................................................. 89 3D Objects ...................................................................................................... 93 Common elements of 3D object waveguides ....................................................... 94 Clipping Planes ..................................................................................................... 103 Profile Designer ........................................................................................... 107 Main parts of the GUI ............................................................................................ 108 Main menu bar....................................................................................................... 112 Toolbars ................................................................................................................. 112 Library Browser toolbar ....................................................................................... 113 Profile toolbar........................................................................................................ 114Table of Contents Installing OptiFDTD ......................................................................................... 1 Hardware and software requirements..................................................................... 1 Protection key ........................................................................................................... 2 Installation ................................................................................................................. 2 Technical support ..................................................................................................... 3 Overview........................................................................................................... 5 What is OptiFDTD? ................................................................................................... 5 OptiFDTD applications and how they relate to one another................................. 6 OptiFDTD_Designer .................................................................................................. 6 Main elements of a layout design............................................................................ 8 What’s new in OptiFDTD 8.0 ......................................................................... 11 64-bit 2D Simulator ................................................................................................. 11 Heating Absorption................................................................................................. 13 Total Field Scattering Field 2D simulations and analysis ................................... 13 OptiFDTD_Designer....................................................................................... 17 Main parts of the GUI .............................................................................................. 18 Main menu bar......................................................................................................... 22 Toolbars ................................................................................................................... 22 OptiFDTD_Designer menus and buttons..................................................... 23 File menu ................................................................................................................. 23 Edit menu................................................................................................................. 24 View menu ............................................................................................................... 25 Tools menu .............................................................................................................. 27 Draw menu............................................................................................................... 27 Simulation menu ..................................................................................................... 31 Preferences menu ................................................................................................... 31 Window menu.......................................................................................................... 32 Help menu................................................................................................................ 32 OptiFDTD_Designer functions...................................................................... 33OptiBPM Specific Materials ........................................................................ 169 Material Class ........................................................................................................ 169 Create and edit materials ..................................................................................... 169 Dielectric material (Ordinary)............................................................................... 170 Diffused material ................................................................................................... 173 OptiFDTD Specific Materials....................................................................... 177 Material Class ........................................................................................................ 177 Create and edit materials ..................................................................................... 177 Dielectric ................................................................................................................ 178 Dispersion.............................................................................................................. 183 Converting the ‘Sellmeier equation’ to ‘Lorentz Model’ .................................... 184 Nonlinear................................................................................................................ 192 Perfect Conductor................................................................................................. 196 2D Band Solver ............................................................................................ 199 2D Band Solver Parameters ................................................................................. 199 File menu ............................................................................................................... 201 Simulation menu ................................................................................................... 201 View menu ............................................................................................................. 201 Help menu.............................................................................................................. 202 Waveguides.................................................................................................. 205 Waveguide properties........................................................................................... 205 Waveguide profiles ............................................................................................... 205 Wafer ...................................................................................................................... 208 Waveguide vs. wafer............................................................................................. 209 Initial data .............................................................................................................. 211 Local Coordinate System ..................................................................................... 211 User Interface of a Parameterized position of a Layout Shape ........................ 212 Waveguides ........................................................................................................... 214 Linear ..................................................................................................................... 216 Arc .......................................................................................................................... 222 Elliptic .................................................................................................................... 228 Ring ........................................................................................................................ 233 S-Bend Sines ......................................................................................................... 239 S-Bend Arc............................................................................................................. 239 S-Bend Sine ........................................................................................................... 244S-Bend Cosine....................................................................................................... 250 Linear Taper........................................................................................................... 256 Parabolic Taper ..................................................................................................... 262 Exponential Taper ................................................................................................. 267 S-Bend Arc Taper.................................................................................................. 273 S-Bend Sine Taper ................................................................................................ 278 S-Bend Cosine Taper............................................................................................ 285 Circular Lens ......................................................................................................... 291 Elliptic Lens ........................................................................................................... 296 Parabolic Lens....................................................................................................... 303 Hyperbolic Lens .................................................................................................... 309 Polynomial ............................................................................................................. 315 Photonic Band Gap (PBG) Crystal Structure ..................................................... 321 Basic 3D Linear Tapering and Proportional Interpretation of Fiber Profile..... 330 Input Field..................................................................................................... 339 Input Field vs. Input Plane.................................................................................... 339 Insert an input plane ............................................................................................. 340 Input Field dialog box ........................................................................................... 343 Mode—Global Data: ADI Method ......................................................................... 359 Mode Solver 2D ..................................................................................................... 379 Mode Solver 2D—menus ...................................................................................... 380 Mode Solver 2D—tabs .......................................................................................... 396 TFSF Region Properties ....................................................................................... 401 3D Mode Solver............................................................................................ 407 Main parts of the GUI ............................................................................................ 410 Main menu bar....................................................................................................... 414 Toolbars ................................................................................................................. 414 3D Mode Solver menus and buttons.......................................................... 417 File menu ............................................................................................................... 417 View menu ............................................................................................................. 417 Simulation menu ................................................................................................... 419 Data menu.............................................................................................................. 419 Preferences menu ................................................................................................. 420 Help menu.............................................................................................................. 420 3D Mode Solver functions........................................................................... 421Profile Designer menus............................................................................... 117 File menu ............................................................................................................... 117 View menu ............................................................................................................. 117 Tools menu ............................................................................................................ 117 Help menu.............................................................................................................. 117 Profile Designer context menu ............................................................................ 118 Profile Designer functions .......................................................................... 119 Library Browser..................................................................................................... 119 Compare Libraries ................................................................................................ 119 Edit Variables and Functions............................................................................... 122 Mode—Global Data: ADI Method ......................................................................... 123 Mode Settings........................................................................................................ 124 Options................................................................................................................... 125 Profiles.......................................................................................................... 127 Fiber ....................................................................................................................... 127 Channel .................................................................................................................. 131 OptiBPM Specific Diffused Materials ......................................................... 137 Custom Diffusion Processes and Arbitrary Index Profiles ............................... 137 Diffusion Process Library .................................................................................... 137 Ti:LiNb03 profile - Titanium diffusion in lithium niobate................................... 138 Ti:LiNbO 3 Pro toolbar ........................................................................................... 139 Mg:LiNb03 profile - Magnesium diffusion in lithium niobate............................ 143 Mg:LiNb0 3 Pro toolbar .......................................................................................... 144 Proton Exchange profile - H+:LiNb03.................................................................. 148 Proton Exchange toolbar ..................................................................................... 149 Annealing Process................................................................................................ 151 OptiBPM Specific User Function Profile.................................................... 153 OptiBPM Specific User DLL Profile............................................................ 159 Center point ........................................................................................................... 162 Materials ....................................................................................................... 167Mode Found........................................................................................................... 421 Status Bar .............................................................................................................. 422 3D Graph Items...................................................................................................... 422 Show slice selector............................................................................................... 426 Customize .............................................................................................................. 426 Data menu.............................................................................................................. 429 3D Graph Settings................................................................................................. 432 Layout Options...................................................................................................... 441 Observation Points, Areas, and Lines ....................................................... 445 Observation Point ................................................................................................. 445 Observation Area .................................................................................................. 445 Observation Line................................................................................................... 446 Simulation toolbar................................................................................................. 446 Observation Points...................................................................................... 447 Observation properties—Point dialog box ......................................................... 448 Observation Area......................................................................................... 451 Observation properties -- X-Z Area dialog box .................................................. 452 Observation properties -- Y-Z Area dialog box .................................................. 455 Observation properties -- X-Y Area dialog box .................................................. 457 Observation Area Analysis dialog box ............................................................... 459 Observation Line.......................................................................................... 474 Observation properties -- Vertical Line dialog box............................................ 475 OptiFDTD_Simulator (2D)............................................................................ 479 Main parts of the GUI ............................................................................................ 480 Main menu bar....................................................................................................... 483 Toolbars ................................................................................................................. 483 OptiFDTD_Simulator (2D) menus and buttons ......................................... 485 File menu ............................................................................................................... 485 View menu ............................................................................................................. 485 Simulation menu ................................................................................................... 487 Preferences menu ................................................................................................. 489Export..................................................................................................................... 597 3D Graph Items...................................................................................................... 598 Simulation menu ................................................................................................... 598 Components menu................................................................................................ 601 Preferences menu ................................................................................................. 601 OptiFDTD Tools............................................................................................ 605 Overlap Integral............................................................................................ 607 Gaussian Overlap Scanner ......................................................................... 615 Overlap Integral Scanner ............................................................................ 619 Multiple Fields .............................................................................................. 623 Notes ...................................................................................................................... 628 Multiple Gaussians ...................................................................................... 629 Notes ...................................................................................................................... 632 Confinement Factor ..................................................................................... 633 Notes ...................................................................................................................... 638 Far Field........................................................................................................ 639 Fraunhofer approximation ................................................................................... 639 Fresnel-Kirchhoff Diffraction Formula ................................................................ 640 2D Far Field............................................................................................................ 641 3D Far Field............................................................................................................ 643 References............................................................................................................. 645 Mode 2D........................................................................................................ 647 Modes of Planar Waveguides .............................................................................. 649 File menu ............................................................................................................... 650 Edit menu............................................................................................................... 650 View menu ............................................................................................................. 651 Simulation menu ................................................................................................... 651 Window menu........................................................................................................ 651Help menu.............................................................................................................. 489 Simulation Parameters ......................................................................................... 490 Boundary Conditions............................................................................................ 491 Observation Point ................................................................................................. 492 Finalization ............................................................................................................ 494 OptiFDTD_Simulator (2D) functions .......................................................... 495 View list.................................................................................................................. 495 Status bar............................................................................................................... 496 3D Graph settings ................................................................................................. 501 OptiFDTD_Simulator (3D)............................................................................ 513 Main parts of the GUI ............................................................................................ 514 Main menu bar....................................................................................................... 517 Toolbars ................................................................................................................. 517 OptiFDTD_Simulator (3D) menus and buttons ......................................... 519 File menu ............................................................................................................... 519 View menu ............................................................................................................. 519 Simulation menu ................................................................................................... 522 Preferences menu ................................................................................................. 523 Help menu.............................................................................................................. 523 Simulation Parameters ......................................................................................... 524 Boundary Conditions............................................................................................ 525 Finalization ............................................................................................................ 527 OptiFDTD_Simulator (3D) functions .......................................................... 529 View list.................................................................................................................. 529 Status bar............................................................................................................... 530 3D Graph settings ................................................................................................. 535 PWE Band Solver......................................................................................... 545 OptiFDTD_Analyzer (2D Simulations)........................................................ 553 Main parts of the GUI ............................................................................................ 554 Components .......................................................................................................... 556 Main menu bar....................................................................................................... 559Toolbars ................................................................................................................. 559 OptiFDTD_Analyzer menus and buttons (2D Simulations)...................... 561 File menu ............................................................................................................... 561 View menu ............................................................................................................. 562 Components menu................................................................................................ 563 Simulation menu ................................................................................................... 564 Preferences menu ................................................................................................. 564 Tools menu ............................................................................................................ 564 Window menu........................................................................................................ 565 Help menu.............................................................................................................. 565 OptiFDTD_Analyzer functions (2D Simulations)....................................... 567 Export..................................................................................................................... 567 3D Graph Items...................................................................................................... 568 Components menu................................................................................................ 568 Simulation menu ................................................................................................... 568 Preferences menu ................................................................................................. 571 Tools menu ............................................................................................................ 571 OptiFDTD_Analyzer (3D Simulations)........................................................ 575 Main parts of the GUI ............................................................................................ 576 Main menu bar....................................................................................................... 580 Toolbars ................................................................................................................. 580 OptiFDTD_Analyzer menus and buttons (3D simulations) ...................... 581 File menu ............................................................................................................... 581 View menu ............................................................................................................. 582 Components menu................................................................................................ 583 Simulation menu ................................................................................................... 584 Preferences menu ................................................................................................. 584 Tools menu ............................................................................................................ 584 Window menu........................................................................................................ 585 Help menu.............................................................................................................. 585 OptiFDTD_Analyzer functions (3D simulations) ....................................... 587 Analysis Tools....................................................................................................... 587Code V Converter......................................................................................... 727 Data format ............................................................................................................ 729 EXFO OWA Converter ................................................................................. 731 Zemax Converter.......................................................................................... 739 Conversion ............................................................................................................ 739 Notes on Conversion ............................................................................................ 740 Data formats .......................................................................................................... 741 ZEMAX Beam File (ZBF) binary format ............................................................... 741 Appendix A: Opti2D Graph Control............................................................ 743 User interface features ......................................................................................... 744 Graph Properties dialog ....................................................................................... 754 Appendix B: File formats ............................................................................ 763 Data file formats .................................................................................................... 763 Appendix C: Parser supported functions.................................................. 773 Supported functions ............................................................................................. 773 Function Limits and _FnRslt_.............................................................................. 778 Appendix D: Batch processing................................................................... 781 Automatic loading of VB Script from command line ......................................... 785Simulation functions............................................................................................. 652 Correlation Function Method (CFM).................................................................... 660 File menu ............................................................................................................... 661 Edit menu............................................................................................................... 661 View menu ............................................................................................................. 662 Simulation menu ................................................................................................... 662 Window menu........................................................................................................ 662 Simulation functions............................................................................................. 663 User Defined File................................................................................................... 672 File menu ............................................................................................................... 673 Edit menu............................................................................................................... 674 View menu ............................................................................................................. 674 Simulation menu ................................................................................................... 674 Window menu........................................................................................................ 674 Notes: ..................................................................................................................... 676 Mode 3D........................................................................................................ 677 File menu ............................................................................................................... 677 Edit menu............................................................................................................... 678 View menu ............................................................................................................. 678 Operations menu................................................................................................... 680 Simulation menu ................................................................................................... 680 Draw Tool menu .................................................................................................... 681 Preferences menu ................................................................................................. 681 Layout Designer Dialog boxes of Mode Solver 3D ............................................ 683 Layout Settings layout dialog box....................................................................... 702 Waveguide Colors layout dialog box .................................................................. 703 Notes: ..................................................................................................................... 704 User Guide of View 3D................................................................................. 705 Commands of View 3D ......................................................................................... 705 View menu ............................................................................................................. 707 Toolbars menu ...................................................................................................... 707 Status Bar menu.................................................................................................... 708 Settings menu ....................................................................................................... 711 Dialog boxes of View 3D....................................................................................... 713 Notes: ..................................................................................................................... 726
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