Terahertz time-domain spectroscopy of absorbing materials

Frédéric Garet, B. Blampey, J.-L. Coutaz


In this paper, we study the noise-limited precision on the complex refractive index value of materials in the terahertz frequency range as determined by terahertz time-domain spectroscopy. As absorbing samples are almost opaque, transmission measurements are not suitable to determine the refractive index and reflection indices have to be employed instead, but at the expense of precision. We give rules to select the most adapted technique, i.e. in transmission or in reflection, for any given sample of arbitrary transparence

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Photonics Letters of Poland - A Publication of the Photonics Society of Poland
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ISSN: 2080-2242