High-$Q$ Exterior Whispering-Gallery Modes in a Double-Layer Crystalline Microdisk Resonator

High- $Q$ Exterior Whispering-Gallery Modes in a Double-Layer Crystalline Microdisk Resonator

Yuanlin Zheng, Zhiwei Fang, Shijie Liu, Ya Cheng, and Xianfeng Chen

Phys. Rev. Lett. 122, 253902 – Published 27 June 2019

Abstract

Exterior whispering-gallery modes (WGMs), whose mode energy is mainly confined outside the microcavity, can achieve large mode overlapping with the ambient environment, as well as a strong electric field and gradient force at the surface. Here, we demonstrate highly localized WGMs in the nanoair gap of a double-layer crystalline microdisk. The geometry is based on a horizontal slot-waveguide structure of two vertically stacked crystalline microdisks made of lithium niobate thin films. The slot WGM possesses a high quality factor in excess of $1 0^{5}$ without metallic loss. The absorption and scattering loss is reduced by use of the crystalline nanofilm at sub-nm rms surface roughness. The demonstrated configuration can be highly favored in various applications including optical sensing, nonlinear optics, and optomechanics.

Received 11 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.253902

Physics Subject Headings (PhySH)

Classical optics Geometrical & wave optics

Atomic, Molecular & Optical

Authors & Affiliations

Yuanlin Zheng^1,2,*, Zhiwei Fang^3,4,5,*, Shijie Liu^1,2, Ya Cheng^3,4,5,6,‡, and Xianfeng Chen ^1,2,†

¹State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
²Key Laboratory for Laser Plasma (Ministry of Education), Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
³State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
⁴XXL-The Extreme Optoelectromechanics Laboratory, School of Physics and Materials Science, East China Normal University, Shanghai 200241, China
⁵State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
⁶Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China

^*These authors contributed equally to this work.
^†xfchen@sjtu.edu.cn
^‡ya.cheng@siom.ac.cn

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Issue

Vol. 122, Iss. 25 — 28 June 2019

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