Observation of morphology‐dependent resonances caused by the input field in the Raman spectrum of microdroplets

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Abstract
Strong peaks in the Raman spectrum of optically levitated microdroplets were observed and are caused by input resonances. These peaks are generated as the amplitude of the transmitted field is enhanced resonantly if the size of the slowly evaporating droplets fulfils the resonance condition. The spectral position of these peaks is independent of the Raman spectrum. The input resonance peaks appear in the Raman spectrum in addition to the output peaks and can be distinguished from the latter by their spectral shape.