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28 September 2013 Raman spectroscopic sensing using whispering gallery microresonators
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Abstract
We investigate Raman spectroscopic sensing using whispering gallery microresonators as a label-free method toward single particle detection. Whispering gallery mode microresonators are used as platforms to perform sensitive particle detection by exploiting the strong, evanescent field of a resonant mode exposed on the surface of the microresonator. Particles adhered to the microresonator surface interact with the field and scatter photons circulating within the resonator. In particular, Raman scattered photons are detected, providing molecular-specific "fingerprint" information regarding the adhered particles. The exploitation of a resonant mode allows for enhancement of generated Raman signal over traditional methods of spontaneous Raman scattering. Preliminary proof-of-concept experimental results are shown.
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Perry Edwards, Corey Janisch, Bo Peng, Sahin Kaya Ozdemir, Lan Yang, and Zhiwen Liu "Raman spectroscopic sensing using whispering gallery microresonators", Proc. SPIE 8845, Ultrafast Imaging and Spectroscopy, 884512 (28 September 2013); https://doi.org/10.1117/12.2024707
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