Practical Guidelines for Continuous Wave Terahertz Spectroscopy - Perspectives and Challenges in Stand-off Detection

Cielecki, Paweł Piotr; Kristensen, Mathias Hedegaard; Skovsen, Esben

doi:10.1109/irmmw-thz.2019.8874043

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2022

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“…Detailed descriptions of the optical and nitrogen purge setup can be found in Ref. [37]. The sample is placed at the collimated part of the beam using an alumina sample holder to block any part of the beam not passing through a 45 • tapered circular hole with a minimum diameter of 13 mm in the holder where the sample is placed Fig.…”

Section: Methodsmentioning

confidence: 99%

All-dielectric one-dimensional gratings exhibiting Fano resonances in the terahertz region

et al. 2022

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Transmittance spectra of an all-dielectric sub-wavelength grating exhibiting Fano resonances are studied both experimentally and theoretically for a frequency interval spanning several terahertz using both s - and p -polarized radiation. Modeled spectra based on the rigorous coupled wave analysis are shown to be in good agreement with the Fourier transform of measured time-domain transmission spectra for normal and angled incidence. Finally, a model is presented that explains Fano resonance frequencies by matching the propagation constant of a discrete set of guided modes to wavenumbers that both match diffraction orders in the grating and are in a range that allows propagation in the dielectric medium.

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Section: Methodsmentioning

confidence: 99%