Ultra-high Q terahertz whispering-gallery modes in a silicon resonator
Dominik Walter Vogt, Rainer Leonhardt
TL;DR
This paper demonstrates the first experimental observation of ultra-high Q factor terahertz whispering-gallery modes in a silicon resonator, advancing THz photonics with high-quality resonant structures.
Contribution
It presents the first experimental realization of ultra-high Q THz WGMs in a silicon resonator, combining spectroscopy and numerical modeling for mode identification.
Findings
Q factor of 1.5 x 10^4 at 0.62 THz
Observation of higher order radial WGMs
Agreement between experimental data and MDAK theory
Abstract
We report on the first experimental demonstration of terahertz (THz) whispering-gallery modes (WGMs) with an ultra high quality (Q) factor of at 0.62THz. The WGMs are observed in a high resistivity float zone silicon (HRFZ-Si) spherical resonator coupled to a sub-wavelength silica waveguide. A detailed analysis of the coherent continuous wave (CW) THz spectroscopy measurements combined with a numerical model based on Mie-Debye-Aden-Kerker (MDAK) theory allows to unambiguously identify the observed higher order radial THz WGMs.
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