Learning Forum

[Lorenzo Finazzi]

Hello, 

on the lines of the "small scale metalens" example, I designed my metalens and now I am trying to evaluate its performance on my device exploiting POP in Zemax. I have a backside illuminated detector and I designed my metalens so that it can focus the incident light inside the active area (see the attached image). The light is then reflected back by the metallic plate. The metalens's far field is consistent in both lumerical and zemax. However what I am trying to do is to retrieve is the irradiance at the dashed line (see attached image) considering both direct and reflected radiation. However, when I try to set the propagation using POP, I can only set initial and final plane. In this way I cannot "let the radiation propagates" and reflect on the mirror. I can only simulate the direct radiation. Is there any way to overcome this limitation?

Thanks,

Lorenzo

[Niki Papachristou]

HI Lorenzo,

Thank you for reaching out to us! Your work sounds very interesting and your image is very descriptive! I think you are right POP will only measure the propagating light and not the reflected. One alternative that I have thought for you is to convert your system to NSC mode, then you will be able to add Rectangle Detectors at positions of interest and measure the irradiance.

Converting sequential surfaces to non-sequential objects

Let me know if you need any additional help.

Regards,

Niki

[Lorenzo Finazzi]

Hi Niki,

thanks for your answear. I am a beginner for what concern zemax and it is not really trivial for me to understand what you are trying to suggest me. However I will try to understand it. What I was thinking is that it could be possible for me to propagate the field in zemax and then export and import it in lumerical where it is easier to take into account refrections. This is again not trivial because I figured out the exported field is really computationally expensive on the Lumerical side. I have to think about this. 

Thank you!

Lorenzo

[Lorenzo Finazzi]

 

Hello Niki,

I take advantage of this already opened post to ask you a further question. How does Zemax calculate the irradiance from a zbf file exported from Lumerical? In zeemax I get irradiance in the order of 1e12 W/mm^2 (really high) by using field with unitary amplitude in Lumerical.  This is not making much sense to me.

Thank you,

Lorenzo