Simulation of laser light focusing by a dielectric nanocylinder with gold core

Abstract

Abstract Using the finite difference time domain method it was shown that a nanocylinder from silica glass with a diameter of 360 nm and a gold core of 40 nm focuses TM-polarized laser light into a nanojet with a full width at half maximum of 298 nm. Maximum intensity in focal spot is about 4 times higher than intensity of incident Gaussian beam.