High-Q Exterior Whispering-Gallery Modes in a Metal-Coated Microresonator

Yun-Feng Xiao, Chang-Ling Zou, Bei-Bei Li, Yan Li, Chun-Hua Dong, Zheng-Fu Han, and Qihuang Gong
Phys. Rev. Lett. 105, 153902 – Published 6 October 2010

Abstract

We propose a kind of plasmonic whispering-gallery mode highly localized on the exterior surface of a metal-coated microresonator. This exterior (EX) surface mode possesses high quality factors at room temperature, and can be efficiently excited by a tapered fiber. The EX mode can couple to an interior (IN) mode and this coupling produces a strong anticrossing behavior, which not only allows conversion of IN to EX modes, but also forms a long-lived antisymmetric mode. As a potential application, the EX mode could be used for a biosensor with a sensitivity high of up to 500 nm per refraction index unit, a large figure of merit, and a wide detection range.

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  • Received 25 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.153902

© 2010 The American Physical Society

Authors & Affiliations

Yun-Feng Xiao1,*, Chang-Ling Zou2, Bei-Bei Li1, Yan Li1, Chun-Hua Dong2, Zheng-Fu Han2, and Qihuang Gong1,†

  • 1State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People’s Republic of China
  • 2Key Lab of Quantum Information, University of Science and Technology of China, Hefei 230026, Anhui, People’s Republic of China

  • *yfxiao@pku.edu.cn
  • qhgong@pku.edu.cn

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Vol. 105, Iss. 15 — 8 October 2010

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