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Phys Rev Lett. 2010 Oct 8;105(15):153902. Epub 2010 Oct 6.

High-Q exterior whispering-gallery modes in a metal-coated microresonator.

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State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People's Republic of China.


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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