Abstract

Sensitivity enhancement of a whispering-gallery-mode microsphere resonance-shift sensor by coating of a high-refractive index (RI) layer is examined for TM polarization. The enhancement of sensitivity in response to particle adsorption or a RI change of the surroundings at the optimized layer thickness is greater for the TM mode compared with the TE mode, but the TM mode requires a thicker layer. A particular choice of the layer thickness allows the TE and TM shifts to match. Matching of the resonance frequency of the two modes is also examined.

© 2007 Optical Society of America

Enhancing the sensitivity of a whispering-gallery mode microsphere sensor by a high-refractive-index surface layer

Iwao Teraoka and Stephen Arnold
J. Opt. Soc. Am. B 23(7) 1434-1441 (2006)

Theory of resonance shifts in TE and TM whispering gallery modes by nonradial perturbations for sensing applications

Iwao Teraoka and Stephen Arnold
J. Opt. Soc. Am. B 23(7) 1381-1389 (2006)

Thermostable refractive index sensors based on whispering gallery modes in a microsphere coated with poly(methyl methacrylate)

Nai Lin, Lan Jiang, Sumei Wang, Hai Xiao, Yongfeng Lu, and Hailung Tsai
Appl. Opt. 50(7) 992-998 (2011)

Perturbation approach to resonance shifts of whispering-gallery modes in a dielectric microsphere as a probe of a surrounding medium

Iwao Teraoka, Stephen Arnold, and Frank Vollmer
J. Opt. Soc. Am. B 20(9) 1937-1946 (2003)

Resonance shifts of counterpropagating whispering-gallery modes: degenerate perturbation theory and application to resonator sensors with axial symmetry

Iwao Teraoka and Stephen Arnold
J. Opt. Soc. Am. B 26(7) 1321-1329 (2009)