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23 March 2005 Nanometer-scale resonant cavities
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Abstract
Cavity enhanced directional resonance has been experimentally observed in single optically-trapped polystyrene particles, which have a size range from 9 μm down to several hundred nm. The higher resonance peaks correspond to longitudinal modes of the directional laser oscillation in a deformed spherical resonator. The lower peaks are attributed to whispering-gallery modes. For a particle with a diameter of approximately 9 μm, the longitudinal mode numbers of the resonator that is responsible for the observed sharp emission peaks are identified using a ray optics model. It is suggested that both directional and whispering-gallery modes can exist in nanometer-scale size resonators. The potential use of such resonant optical cavities in fiber-based optical sensors for chemical diagnostics is suggested. Considerable additional work is required to completely model and measure the observation of effects briefly summarized here.
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Liangmin Zhang, Fajian Zhang, You-Xiong Wang, William B. Spillman, Jr., and Richard O. Claus "Nanometer-scale resonant cavities", Proc. SPIE 5691, Optical Fibers and Sensors for Medical Applications V, (23 March 2005); https://doi.org/10.1117/12.602111
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