dorsal/arxiv
View SchemaA spatial refractive index sensor using whispering gallery modes in an optically trapped microsphere
| Authors | P. Zijlstra, K. L. van der Molen, A. P. Mosk |
|---|---|
| Categories | |
| ArXiv ID | physics/0612070 |
| URL | https://arxiv.org/abs/physics/0612070 |
| DOI | 10.1063/1.2722695 |
Abstract
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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"abstract": "We propose the use of an optically trapped, dye doped polystyrene microsphere\nfor spatial probing of the refractive index at any position in a fluid. We\ndemonstrate the use of the dye embedded in the microsphere as an internal\nbroadband excitation source, thus eliminating the need for a tunable excitation\nsource. We measured the full width at half maximum of the TE and TM resonances,\nand their frequency spacing as a function of the refractive index of the\nimmersion fluid. From these relations we obtained an absolute sensitivity of\n5e-4 in local refractive index, even when the exact size of the microsphere was\nnot a priori known.",
"arxiv_id": "physics/0612070",
"authors": [
"P. Zijlstra",
"K. L. van der Molen",
"A. P. Mosk"
],
"categories": [
"physics.optics"
],
"doi": "10.1063/1.2722695",
"title": "A spatial refractive index sensor using whispering gallery modes in an optically trapped microsphere",
"url": "https://arxiv.org/abs/physics/0612070"
},
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