Learning Forum

[Chu Huy Hoang]

Hello,

Currently, I am involved in a project that requires the simulation of white light interference signals from various samples. I would like to know the possibility of using Lumerical to do it.

This is the actual signal captured by CSI. And I want to simulate it with FDTD. I tried using the time domain monitor and recording the reflected pulse. They give a similar pulse shape, but we won't be able to see anything other than intensity data across the scanning step.

If anyone has experience with this, I would greatly appreciate your insights and expertise.

Thank you. 

[Guilin Sun]

Could you please elaborate more on what kind of results you are intended to get?

The image showes the intensity vs distance (?) It is not known if this is time domain or frequency domain. please give more information.

 

 

[Chu Huy Hoang]

Hello,

Thank you for your message.

What I aim to do is model the Coherence Scanning Interferometer using Lumerical.

In this setup, white light is divided into two paths by a beam splitter. One path goes to the reference mirror, which I intend to represent as PEC (Perfect Electric Conductor) material, and the other path goes to the sample. Due to the low coherence of white light, the two beams will only interfere when the optical path difference between them is nearly zero.

The signal I provided indicates the intensity values when the mirror is scanned. The signal shows that at the reference mirror position around 50 µm, the intensity is highest, which means the optical path difference between the reference beam and the measurement beam is almost zero.

My idea is to configure the optical setup in Lumerical similar to the figure above, scan the reference mirror, and record the intensity when the two beams combine at each discrete scanning distance.

I hope this helps clarify my request.

Thank you.

[Guilin Sun]

This would be very challenge!

1: FDTD simulates purely coherent light and completely incohrent light. For light source with limited coherence length, some entensive post-processing model should be developed by your self.

2: even though you have developed such a model, the simulation area (2D) or volume would be large, or very large that your computer may not have enough resources.

So please rethink this project with FDTD simulation. If there is a reference paper using this technique please share here and I'd be very interested in such simulations. Thanks!