A spatial refractive index sensor using whispering gallery modes in an optically trapped microsphere

Details A spatial refractive index sensor using whispering gallery modes in an optically trapped microsphere A spatial refractive index sensor using whispering gallery modes in an optically trapped microsphere

2006-12-07

arxiv.org/abs/physics/0612070v1

Physics

Optics

3 pages, 3 figures

Scientific paper

We propose the use of an optically trapped, dye doped polystyrene microsphere for spatial probing of the refractive index at any position in a fluid. We demonstrate the use of the dye embedded in the microsphere as an internal broadband excitation source, thus eliminating the need for a tunable excitation source. We measured the full width at half maximum of the TE and TM resonances, and their frequency spacing as a function of the refractive index of the immersion fluid. From these relations we obtained an absolute sensitivity of 5e-4 in local refractive index, even when the exact size of the microsphere was not a priori known.

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