100 research outputs found
Nonlinear metal-dielectric nanoantennas for light switching and routing
We introduce a novel hybrid metal-dielectric nanoantenna composed of
dielectric (crystalline silicon) and metal (silver) nanoparticles. A
high-permittivity dielectric nanoparticle allows to achieve effective light
harvesting, and nonlinearity of a metal nanoparticle controls the radiation
direction. We show that the radiation pattern of such a nanoantenna can be
switched between the forward and backward directions by varying only the light
intensity around the level of 11 MW/cm, with the characteristic switching
time of 260 fs.Comment: 9 pages, 5 figures, submitted to New J. Phy
All-Dielectric Optical Nanoantennas
We study in detail a novel type of optical nanoantennas made of
high-permittivity low-loss dielectric particles. In addition to the electric
resonances, the dielectric particles exhibit very strong magnetic resonances at
the nanoscale, that can be employed in the Yagi-Uda geometry for creating
highly efficient optical nanoantennas. By comparing plasmonic and dielectric
nanoantennas, we demonstrate that all-dielectric nanoantennas may exhibit
better radiation efficiency also allowing more compact design
- …