Open AccessPrism coupling of high-Q terahertz whispering-gallery-modes over two octaves from 02 THz to 11 THz
Author(s) -
Dominik Walter Vogt,
Angus Harvey Jones,
Harald G. L. Schwefel,
R. Leonhardt
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.031190
Subject(s) - terahertz radiation , prism , optics , resonator , whispering gallery wave , broadband , terahertz spectroscopy and technology , whispering gallery , materials science , q factor , optoelectronics , physics
We report on prism coupling of high-quality (high-Q) terahertz (THz) whispering-gallery modes (WGMs) in spherical high resistivity float zone grown silicon (HRFZ-Si) resonators over two octaves from 0.2 THz to 1.1 THz. The WGMs are excited using a HRFZ-Si prism and show unprecedented quality factors of up to 2.2 × 10 4 . A detailed discussion of the phase-and mode-matching criteria of the prism coupling scheme implemented in the continuous wave THz spectroscopy system is presented. The results provide numerous opportunities for passive ultra-broadband high-Q devices operating in the THz frequency range.