It has long been known that the optical resonances of ultrahigh-Q whispering gallery mode resonators can split under the influence of particle scattering. Now scientists have exploited this splitting to accurately determine particle sizes.
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Kippenberg, T. Particle sizing by mode splitting. Nature Photon 4, 9–10 (2010). https://doi.org/10.1038/nphoton.2009.246
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DOI: https://doi.org/10.1038/nphoton.2009.246
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