Abstract
The Amsterdam discrete dipole approximation (ADDA) is used to study the effects of an inhomogeneous refractive index in the surrounding medium of a microspherical resonator on the quality and position of the whispering gallery modes (WGMs). The model consists of a polystyrene microsphere with a refractive index, n, of 1.587 surrounded by water (n=1.333) and an inhomogeneity (n=1.5) on top of the microsphere. The effect of the area of the inhomogeneity on the WGMs is modeled using the ADDA code and compared with Lorenz-Mie code. WGMs of various quantum dot embedded microspheres mounted on atomic force microscope cantilevers are experimentally measured and shown to be consistent with the model.
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