High-Q exterior whispering gallery modes in a metal-coated microresonator
Optics
2015-05-20 v1 Quantum Physics
Abstract
We propose a kind of plasmonic whispering gallery modes 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 anti-crossing behavior, which not only allows conversion of IN to EX modes, but also forms a long-lived anti-symmetric mode. As a potential application, the EX mode could be used for a biosensor with a sensitivity high up to 500 nm per refraction index unit, a large figure of merit, and a wide detection range.
Keywords
Cite
@article{arxiv.1011.0251,
title = {High-Q exterior whispering gallery modes in a metal-coated microresonator},
author = {Yun-Feng Xiao and Chang-Ling Zou and Bei-Bei Li and Yan Li and Chun-Hua Dong and Zheng-Fu Han and Qihuang Gong},
journal= {arXiv preprint arXiv:1011.0251},
year = {2015}
}