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(Color online) Sketch of the experimental setup. The direction indicates the vertical direction in the laboratory system. The image shows a trapped PM coupled to the excitation beam.
TE and TM polarized reflectivity spectra of a PM at a distance to the substrate of about . The TM spectrum is displaced vertically by 0.5 for clarity. The resonances are labeled by the WGM order and number in the subscript.
(Color online) Reflectivity spectra around the mode for a PM of diameter at varying distances to the substrate. Curves are labeled with the corresponding trap position in nanometers. Inset: measured linewidth vs . Solid squares are FWHM with error bars being the standard deviation from a Lorentzian fit over a time series. Circles are widths of the sharpest subresonances. The solid line indicates the expected dependence (see text), and the dashed line the spectrometer resolution.
(Color online) Reflectivity spectrum of a resonance of a PM of diameter, measured by scanning the DFB. The spectrum is fitted by a sum of three Lorentzian curves (lines). Inset: reflectivity of the same microsphere as a function of time on a gray scale from 0.2 (black) to 1 (white).
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