Abstract

We report theoretical simulations on the photonic nanojet (PNJ) of single dielectric microspheres of various sizes illuminated by focused Gaussian beams (FGBs), using analytical theory developed by Gouesbet et al. based on the Bromwich formalism. The radius of the microsphere ($R$) is varied from 1 to 45 µm. The effect of the beam waist (${\omega _0}$) on characteristic parameters such as maximum electric field enhancement (${\eta _{\rm max}}$) of the PNJ, the focal length of the microsphere ($f$), effective length, and width of the PNJ is studied in detail. The effect of the refractive index of the microsphere (${n_p}$) and $R$ on the ${\eta _{\rm max}}$ for different values of ${\omega _0}$ is studied. The dependence of (i) the $f$ value on $R$ and (ii) the ${\eta _{\rm max}}$ value on $\lambda $ is investigated systematically.

© 2020 Optical Society of America

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