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

页码：2220 / 2223

页数：4