How to Simulate Nanophotonic Devices with Lumerical FDTD Solutions
Lumerical FDTD Solutions is a powerful software tool that allows you to model and simulate nanophotonic devices, processes and materials using the finite difference time domain (FDTD) method. FDTD is a numerical technique that solves Maxwell's equations in the time domain by discretizing space and time into a grid of finite cells. FDTD can handle complex geometries, nonlinearities, anisotropies, dispersive materials and broadband sources with high accuracy and efficiency.
In this article, we will show you how to use Lumerical FDTD Solutions to design and optimize nanophotonic devices for various applications such as micro-LEDs, augmented reality, magneto-optics and lasers. We will also introduce some of the key features and capabilities of Lumerical FDTD Solutions that make it the gold-standard for nanophotonics simulation.
Getting Started with Lumerical FDTD Solutions
To get started with Lumerical FDTD Solutions, you need to download and install the software from the Ansys website. You can request a free trial or purchase a license depending on your needs. Once you have installed the software, you can launch it from your desktop or start menu.
Lumerical FDTD Solutions has a user-friendly graphical user interface (GUI) that allows you to create and edit your simulation objects, run simulations, analyze results and optimize your design. You can also use scripting commands to automate tasks and customize your workflow. The GUI consists of several windows such as the layout editor, the simulation toolbar, the properties window, the script editor and the results viewer.
The layout editor is where you define your simulation geometry by adding structures, sources, monitors and other simulation objects. You can use predefined primitives or import custom shapes from CAD files. You can also use the layer builder tool to create layered structures from material data or the dataset builder tool to create structures from imported data.
The simulation toolbar is where you set up your simulation parameters such as boundary conditions, mesh settings, solver options and run controls. You can use the default settings or adjust them according to your needs. You can also use the mesh override tool to refine the mesh in specific regions or the ports tool to define waveguide ports for S-parameter extraction.
The properties window is where you edit the properties of each simulation object such as name, position, size, material, source type, monitor type etc. You can use the material explorer tool to browse and modify the material database or create your own materials using different models such as sampled data, analytic or flexible material plugins.
The script editor is where you write and execute scripting commands using Lumerical's scripting language. You can use scripting commands to perform tasks such as creating objects, running simulations, accessing results, performing calculations, plotting graphs etc. You can also use scripting commands to optimize your design using built-in or custom optimization algorithms.
The results viewer is where you visualize and analyze your simulation results such as electric fields, power fluxes, far-field patterns, Q-factors etc. You can use various tools such as line plots, surface plots, volume plots etc. to display your results in different formats. You can also export your results to other formats such as text files or images.
Example: Simulating a Micro-LED Device with Lumerical FDTD Solutions
To illustrate how to use Lumerical FDTD Solutions for nanophotonics simulation, we will show you how to simulate a micro-LED device that emits light at 450 nm wavelength. A micro-LED device is a type of light-emitting diode (LED) that has a very small size (typically less than 10 microns) and high brightness. Micro-LEDs are promising candidates for applications such as displays, lighting and biomedical imaging.
The following steps describe how to simulate a micro-LED device with Lumerical FDTD Solutions:
Create a new project file by clicking on File > New in the GUI.
In the layout editor window, add a rectangle structure with width = 5 um, height = 5 um 061ffe29dd