Micro-optical force sensor concept based on whispering gallery mode resonators

被引：144

作者：

Ioppolo, Tindaro ^{[1
]}

Kozhevnikov, M. Ichael ^{[2
]}

Stepaniuk, Vadim ^{[2
]}

Otugen, M. Volkan ^{[1
]}

Sheverev, Valery ^{[2
,3
]}

机构：

[1] So Methodist Univ, Dept Mech Engn, Dallas, TX 75275 USA

[2] Lenterra Inc, W Orange, NJ 07102 USA

[3] Polytech Univ, Dept Phys, Metrotech Ctr 6, Brooklyn, NY 11201 USA

来源：

APPLIED OPTICS | 2008年 / 47卷 / 16期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1364/AO.47.003009

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A micro-optical force sensor concept based on the morphology-dependent shifts of optical modes of dielectric microspheres is investigated. The optical resonances, commonly referred to as the whispering gallery modes (WGM), were excited by evanescently coupling light from a tunable diode laser using a tapered single-mode fiber. A compressive force applied to the sphere induces a change in both the shape and the index of refraction of the sphere leading to a shift in WGM. By tracking the shifts, the force magnitude is determined using solid silica as well as solid and hollow Polymethyl-methacrylate (PMMA) microsphere resonators. A measurement sensitivity as high as d lambda/dF = 7.664 nm/N was demonstrated with a 960 mu m hollow PMMA sphere. (C) 2008 Optical Society of America.

引用

页码：3009 / 3014

页数：6

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