MicroLED Simulation Workflow with Ansys Lumerical
Hello, this is Majid Heidari from Ozen Engineering, Inc. In my previous video, I discussed how to simulate microLEDs using numerical stacks. In this video, I will focus on numerical FDTD packages that can be used for simulating microLEDs.
Overview of Numerical FDTD
With numerical FDTD, we can calculate:
- Near field
- Far field
- Total transmission into the far field
- Total extraction efficiency
General Workflow
Let's discuss the general workflow:
- We have an assist charge and multi-quantum well.
- With charge and multi-quantum well, we can simulate electronics and optoelectronics to figure out merits.
- We can calculate the IV curve, spontaneous emission power, and quantum efficiency.
- With numerical stack, we can calculate the emitter emitted power and power density.
Focus on FDTD
In this video, we focus on using Ansys FDTD to calculate the incoherent unpolarized emission of microLEDs. Specifically, we aim to calculate:
- Far field emission pattern
- Extraction efficiency
For more details, please follow the link provided in the video description.
Using Ansys Software
With Ansys software, we can calculate the microLED using:
- Charge: Python and drift diffusion equation
- Multi-quantum well: Schrödinger equation
With charge, we calculate carrier density and potential. In FDTD, we inject the dipole and calculate the far-field power spectrum. The output of FDTD is used to calculate the true far-field power spectrum.
MicroLED Structure
This is the microLED discussed in my previous video. It consists of different layers with varying thicknesses and parameters, such as:
- Gallium Arsenide
- Aluminum Gallium Indium Phosphide
- Aluminum Indium Phosphide
With FDTD simulation, we can calculate:
- Near field
- Far field
- Total transmission into the far field
- Total extraction efficiency at a specific angle (e.g., 34.4 degrees)
Results
Let's go and look at the results in Lumerical.
Hi, this is Majid Heidari from Ozen Engineering. In my previous video, I discussed how we can simulate the MicroLED with a numerical stack. In this video, I want to discuss numerical FDTD packages that can be used for simulating MicroLED.
With numerical FDTD, we can calculate the near field, far field, total transmission into the far field, and total extraction efficiency. Let's discuss the general workflow. We have an active charge and multi-quantum well.
With active charge and multi-quantum well, we can simulate the electronics and optoelectronics, figure out merits, calculate the IV curve, spontaneous emission power, and quantum efficiency. With a numerical stack, we can calculate the emitter emitted power density.
In this video, we want to use Ansys FTTD to calculate the incoherent unpolarized emission of MicroLED. We want to calculate the far field emission pattern and extraction efficiency. The detailed process can be found at this link.
In FTTD, we will inject a dipole and calculate the far-field power spectrum. We will use multiple quantum wells and extract the spontaneous emission power spectrum.
The output of FTTD goes to a box, and using the spontaneous emission power spectrum, we can calculate the true far-field power spectrum. In this part of the video, we will focus on FTTD. We will use a dipole power and calculate the far-field power spectrum.
For more details on how different packages work in simulating MicroLED, please visit the MicroLED example at the ANSYS website.
In my previous video, I discussed a MicroLED with different layers, such as gallium arsenide, poly, aluminum gallium indium phosphide, and aluminum indium phosphide, with different thicknesses and parameters.
With FTTD simulation, we can calculate the near field, far field, total transmission into the far field, and total extraction efficiency at a specific degree, such as 34.4 degrees. Let's go and look at the result in Lumerical.
