Free-space coupling to symmetric high-Q terahertz whispering-gallery mode resonators

被引：11
|
作者：
Vogt, Dominik Walter [1 ,2 ]
Jones, Angus Harvey [1 ,2 ]
Leonhardt, Rainer [1 ,2 ]
机构：
[1] Univ Auckland, Dept Phys, Auckland 1010, New Zealand
[2] Dodd Walls Ctr Photon & Quantum Technol, Auckland, New Zealand
来源：
OPTICS LETTERS | 2019年 / 44卷 / 09期
关键词：
THZ; RESONANCES; SCATTERER;
D O I：
10.1364/OL.44.002220
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report on the coupling of a free-space Gaussian beam to symmetric high-quality (Q) whispering-gallery mode resonators (WGMRs) for terahertz (THz) radiation. We achieve very high excitation efficiencies up to 50% to THz WGMs with a Q-factor of 1.5 x 10(4) at 0.7 THz. The high coupling efficiencies have been realized by leveraging a Gaussian beam with a nearly diffraction-limited focal spot, as well as readily available low-loss, high-index silicon spheres with diameters comparable to the wavelength. The results convincingly underline the viability of free-space coupling in the THz frequency range. (C) 2019 Optical Society of America
引用
收藏
页码：2220 / 2223
页数：4
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