Internal electric field distributions of a dielectric cylinder at resonance wavelengths

Calculations of the electric field distribution within and around an infinite circular dielectric cylinder, having a relative index of refraction of 1.53 and illuminated with plane-wave radiation of wavelength lambda, have been performed for size parameters ranging from 39 to 51. Results for size parameters that satisfy resonance conditions for various atural modes of oscillation of the cylinder (mode number n = 53; order numbers l = 1-5) clearly illustrate the physical significance of n and l and show that the internally reflected circumferential waves are localized near, but not confined to, the cylinder surface.