Optical Phenomena in Mesoscale Dielectric Spheres and Immersion Lenses Based on Janus Particles: A Review

The mesoscale optical phenomena in dielectric spheres with a size parameter q = 2π R/ . -0emλ∼ 10 , where R / . -0emλ is the particle radius in incident wavelength units, have been considered. These phenomena make it possible to implement microscopy beyond the diffraction resolution limit. Another example of mesoscale optical phenomena is the field localization in immersion lenses based on Janus particles.