The authors propose the use of an optically trapped, dye doped polystyrene microsphere for spatial probing of the refractive index at any position in a fluid. Using the dye embedded in the microsphere as an internal broadband excitation source the authors eliminated the need for a tunable excitation source. They measured the full width at half maximum and frequency spacing of the transverse electric and transverse magnetic resonances as a function of the refractive index of the immersion fluid. The authors achieved a sensitivity of 5×10-4 in refractive index, even when the exact size of the microsphere was not known. © 2007 American Institute of Physics.
CITATION STYLE
Zijlstra, P., Van Der Molen, K. L., & Mosk, A. P. (2007). Spatial refractive index sensor using whispering gallery modes in an optically trapped microsphere. Applied Physics Letters, 90(16). https://doi.org/10.1063/1.2722695
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