Extreme Light Concentration Inside Plasmonic Gold and Silver Nanoparticles During Laser Irradiation

Computer modeling of the distributions of laser radiation intensities concentrated inside spherical gold and silver nanoparticles with the radii in the range 10-100 nm was carried out during laser irradiation with wavelengths 400, 532, and 800 nm. Distributions of laser intensity are inhomogeneous for investigated values of nanoparticle sizes and laser wavelengths. Here, we show new effect of extreme light intensity concentration in shadow hemisphere of gold and silver nanoparticles with localizing light at the nanoscale for selected values of nanoparticle sizes and radiation wavelengths. No doubt that this effect exists for different NPs and wavelengths. These results can be applied in nanophotonics for construction of new plasmonic antennas and photonic components, and for the laser technologies of the preparation and the treatment of NPs with definite sizes, shapes, structure, size distribution, etc.