Loss tangent of Sio2 and Si at THz Frequency [193 THz] ??

[kela3kela]

Can anyone tell me the value for Loss tangent of Silicon dioxide (SiO2) and Silicon (Si) at 193.5 THz. I have read a lot of literature but the closest value I could find was 0.005 @ 10 THz...Not greater thn this..

Kindly reply.

Regards

 

[FvM]

Your asking about near IR wavelength.

I'm sure you'll find absorbance numbers in optical material data. Of course the structure matters. Crystalline SiO2 (fused silicia, quartz) has a good transparency around 1.5 µm, absorption of IR quality quartz fibre optic is measured in dB/km. Silicon has a low pass wavelength of about 1 µm and still some absorption at 1.5 µm. You should be able to calculate a loss tangent from optical data (after correction for reflection losses).

 

[kela3kela]

Thanks for the detail reply..If possible can you refer some papers as well..

 

[kela3kela]

And what about the Drude model?? does it help for Substates or its just to get the n-k values for metals only?