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[(a) and (b)] The typical transmission spectra of the microsphere before and after the PMMA coating, respectively. (c) Two transmission dips corresponding to the same resonant mode with up- and down-wavelength scanning (blue lines), respectively. Inset: The optical image of the coated microsphere with the diameter of and the PMMA of .
Calculated wavelength shift (a) and mode volume (b) with the increased thickness of the PMMA layer. The diameter of the silica microsphere is . Inset in (a): The experimental result of the several PMMA coating process. Inset in (b): The normalized field amplitude of TE mode in the microsphere with the thickness of 100, 250, and 400 nm, respectively. The green solid and red dashed lines are the boundary of silica and the PMMA layer, respectively.
[(a) and (b)] The typical transmission of the microsphere with CdSe/ZnS QDs before and after the PMMA coating. The red lines are the Lorentzian-shaped fitting. The linewidth is about 1.5 and 0.155 GHz, corresponding to a loaded factor of and , respectively.
The -factor of the different microspheres with deposited QDs (a) and HF etching (b) before (blue solid) and after (red open) the PMMA coating. Insets: The enhanced factor of the corresponds to different samples.
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