For the first time, herein, we report the theoretical investigation on short and elongated
photonic nanojets (PNJs) generated by single solid/hollow core-shell microparticles
illuminated with focused Gaussian beams (FGBs). This investigation is carried out using
developed analytical equations based on Bromwich formalism. The effect of the beam waist,
thickness of shell, size and refractive index of the microparticle on the characteristic
parameters of the PNJs such as maximum electric field enhancement, spatial separation …