Enhancing sensitivity of a whispering gallery mode biosensor by subwavelength confinement

被引：44

作者：

Gaathon, O. ^{[1
]}

Culic-Viskota, J. ^{[1
]}

Mihnev, M. ^{[1
]}

Teraoka, I. ^{[1
]}

Arnold, S. ^{[1
]}

机构：

[1] Polytech Univ, Microparticle Photophys Lab, Brooklyn, NY 11201 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 22期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2397017

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The authors demonstrate enhanced sensitivity of a spherical whispering gallery mode biosensor (WGMB) by confining orbiting light near the surface using a subwavelength (sub-lambda) high refractive index layer on a fluorine doped silica microsphere (radius R similar to 200 mu m). Their experiments at a free space wavelength lambda similar to 1310 nm show that the frequency shift sensitivity by changing the external refractive index is increased by more than 700% by adding a 340 nm thick polystyrene layer. This advance is expected to move the WGMB well into the lead as the most sensitive method for unlabeled biosensing.

引用

页数：3

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