hi. Thanks for your response. I have just build a continuous wave Terahertz setup and started doing experiments. I am passing the THz wave in free space as the reference waveform and then through the acrylic as the sample spectrum. Since there is change in refractive index (in free space and acrylic), I am seeing a phase change. I calculated the phase by merging the waveforms and interpolation.
Like we can find out the phase, if we know the refractive index and extinction coefficient, attenuation and propagation const, i am trying to solve from the back side, calculating the phase and find the refractive index and the other optical constants. Since, it's will be like a film with a finite thickness, i believe, we will see a fabry perot etalon case here.
I am doing it as an exercise, for the following purposes:
i) to be clear about the characteristics.
ii) i know the acrylic refractive index. I am doing the back calculations, to see how the refractive index changes in the THz ranges.
iii) to give a signature to other unknown materials in the THz range, I am just starting off this one as a practice.
Thanks
