“Import optical generation” or “delta generation rate”?

- March 15, 2022 at 3:06 pm
  
  dhouha hach
  Subscriber
  
  Hello,
  I am trying to study the impulse response of a photodiode to a light pulse. Is it better to import an optical generation rate from FDTD or use a delta generation rate in charge?
- March 18, 2022 at 7:41 pm
  
  kghaffari
  Ansys Employee
  
  Hi Are you interested in this analysis to characterize bandwidth? If so I would recommend looking into the transient analysis provided in the vertical photodetector example (published in the Appendix of the article). Here we use the imported optical generation rate from FDTD, and perform a Fourier transform of the impulse current response, to obtain bandwidth. The description in the article and the calculations available in the associated script should be insightful.
- March 19, 2022 at 6:01 am
  
  dhouha hach
  Subscriber
  
  Thank you for the great help. Yes i am using those scripts and simulation examples to get some insights and i did nearly the same approch of importing the optical generation. But then i realized that there is a delta generation which i did not try to use before, and my question is can I use it as a shortcut to obtain an impulse and frequency response ?
- March 23, 2022 at 12:17 am
  
  kghaffari
  Ansys Employee
  
  The delta source can also be used to measure the impulse response of the system. This is particularly useful when characterizing the Internal Quantum Efficiency. For this, the location of the source is swept across the simulation region to obtain the weighting function profile according to the Green's function. To seen an example of this approach and find more information please check the CMOS image sensor example here (specifically step 4).

Viewing 3 reply threads

You must be logged in to reply to this topic.

Ansys Innovation Space

Boost Ansys Fluent Simulations with AWS

Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.

Earth Rescue – An Ansys Online Series

The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog

Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.

Trending discussions