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1887

access icon free Refractive index calculation from echo interference in pulsed terahertz spectroscopy

A method for calculating the average refractive index of a sample using transmission terahertz time-domain spectroscopy in a single measurement is presented. The refractive index is derived from the analysis of the frequency-domain interference caused by Fabry-Pérot reflections in the sample through the discrete Fourier transform of the spectrum module. This approach is simple and fast (not requiring a reference measurement), improves sensitivity over direct time-domain analysis and allows the derivation of the refractive index in a specific frequency window. The method can also be used to identify unwanted reflections in the experimental setup.

References

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      • 3. Withayachumnankul, W., Ferguson, B., Rainsford, T., Mickan, S.P., Abbott, D.: ‘Material parameter extraction for terahertz time-domain spectroscopy using fixed-point iterationin Badenes, G., Abbot, D., and Serpenguzel, A. (Eds): ‘Photonic materials, devices, and applications’ (SPIE Press, Bellingham, WA, 2005), Vol. 5840.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.3937
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content/journals/10.1049/el.2013.3937
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