- I'm new in the field, working on characterization for a model of air , cotton , air in the terahertz band.
- I need to calculate the Permittivity of the cotton in the range from 0.5- 1.5 THZ needed to calculate the total pathloss.
Hello Esraa,
You might be interested by our work in silk foam THz characterization:
https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.201400228
We measuredthe refractive index of silk foam. Because of it's high porosity, we found a refractive index of 1.06 very close to that of air. I guess cotton would show similar values very close to 1 (if its porous).
Otherwise, you can also check our review on THz imaging. Specifically, section 2.2 where we show how to calculate refractive index from transmission/reflection measurements. Here:
https://www.researchgate.net/profile/Hichem_Guerboukha/publication/328966527_Toward_real-time_terahertz_imaging/links/5c06e44292851c6ca1ff0d61/Toward-real-time-terahertz-imaging.pdf
Also, check the terahertz literature, characterization of cotton may have already been demonstrated.
Best
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