Figure | Pilot endoscopic measurements of the THz optical constants. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | Pilot endoscopic measurements of the THz optical constants.

Caption

Figure | Pilot endoscopic measurements of the THz optical constants. a Hollow-core waveguide that uses the anti-resonant reflecting optical waveguiding principle (ARROW) and is based on the polymer-coated sapphire tube. b Schematic of the THz endoscopic system that uses the polymer-coated sapphire waveguide and the reflection-mode backward-wave oscillator (BWO) spectrometer. c Reflection spectra of the sapphire window, which is in contact with air, pure water, and pure propylene glycol (PG). Changes in the amplitude and spectral position of the Fabry-Perot reflectivity minimum are analyzed to quantify the optical constants of an analyte. d Endoscopic data on the THz refractive index n and power absorption coefficient a calculated for the different PG aqueous solutions and compared to the THz pulsed spectroscopy (TPS) data.  All panels are adapted from Katyba, G. M. et al. Applied Physics Letters 124, 243703 (2024), DOI: 10.1063/5.0207898 with the permission of AIP.

Credit

Gleb M. Katyba et al.

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