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How do you perform Lambertian scattering in IR with a UV source in NSC?

  • October 10, 2024
  • 2 replies
  • 72 views
Jonathan C

Hello,

I have a source that emits ultraviolet light. The light passes through an optical fibre and then hits a material that emits infrared light in a Lambertian manner.

How can I ensure that only the rays emitted by the excited surface of my cylinder are all infrared? As you can see in the image below, my source emits infrared light, which is not the case. The small disc above is a detector with which I want to see only the infrared rays of my cylinder.

I tried do this according to this tutorial but I don't understand what I am doing wrong.

https://support.zemax.com/hc/en-us/articles/1500005575642-How-to-model-fluorescence-using-bulk-scattering

 

Best answer by MichaelH

Hi Jonathan,

Since the bulk scattering has to occur inside a volume object, you can simply add a TABLE coating to the rear surface (Face 2) and make sure that only the infrared light is passed through.  You an use something like the following coating:

TABLE IR_PASS
ANGL 0
WAVE 0.69 0 0 0 0 0.0 0.0 0.0 0.0
WAVE 0.70 0 0 1 1 0.0 0.0 0.0 0.0 
ANGL 90
WAVE 0.69 0 0 0 0 0.0 0.0 0.0 0.0
WAVE 0.70 0 0 1 1 0.0 0.0 0.0 0.0

 This is absorb any visible light less than 690nm and will 100% transmit any light greater than or equal to 700nm, regardless of the angle of incidence.  

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MichaelH
Ansys Staff
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  • MichaelH
  • Ansys Staff
  • 360 replies
  • Answer
  • October 10, 2024

Hi Jonathan,

Since the bulk scattering has to occur inside a volume object, you can simply add a TABLE coating to the rear surface (Face 2) and make sure that only the infrared light is passed through.  You an use something like the following coating:

TABLE IR_PASS
ANGL 0
WAVE 0.69 0 0 0 0 0.0 0.0 0.0 0.0
WAVE 0.70 0 0 1 1 0.0 0.0 0.0 0.0 
ANGL 90
WAVE 0.69 0 0 0 0 0.0 0.0 0.0 0.0
WAVE 0.70 0 0 1 1 0.0 0.0 0.0 0.0

 This is absorb any visible light less than 690nm and will 100% transmit any light greater than or equal to 700nm, regardless of the angle of incidence.  

~Michael
Jonathan C
  • Jonathan C
  • Author
  • Single Emitter
  • 1 reply
  • October 14, 2024

Thank you very much Michael!

I tried as you mentioned and it works.

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