Thickness of an Aperture

[twguest]

Hi All, has anyone managed to find a workaround so that we might be able to consider SRWLOptA structs of varying thickness in the z-plane?

[samoylv]

Hi, I would consider the combination of two identical apertures and a drift between them, equal to the aperture thickness.

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On Tue, Dec 18, 2018 at 12:48 PM Trey Guest ***@***.***> wrote: Hi All, has anyone managed to find a workaround so that we might be able to consider SRWLOptA structs of varying thickness in the z-plane? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#122>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABxXKf4SvIZGGNL8IRC2d1AFEvZsgDrjks5u6NYkgaJpZM4ZYJRu> .

[twguest]

Thankyou for your speedy response,

I have considered this as a possible workaround but it may damage my results given their fine dependency on the phase of the wavefront. Is there a discrete step size in the z-direction?

[rafaelcelestre]

Hello all,

dear @samoylv, that is a interesting approach, however I don't think two identical apertures and a drift between them would be the best implementation to solve this problem if absorption and phase shifts is to be taken into account.

To tackle this problem I have implemented a transmission object that simulates the SRWLOptA, but takes into account absorption and "smooth" edged a slit may have - I will have it cleaned up and see how to share that with you (I'm not using WPG, but directly the SRW).

To account for a thick object, @twguest, you may use a multi-slice approach: recursively use this transmission element (with reduced thickness) with a small free-space drift in between them.

best,
rafael

[twguest]

@rafaelcelestre I would be delighted if you were willing to share and would be happy to integrate it into WPG for others

[rafaelcelestre]

@twguest I'll clean it up and share it over the Christmas break.