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Special Seminar: Pavel Belov, " Recent progress in all-dielectric optical antennas"

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Special Seminar: Pavel Belov, " Recent progress in all-dielectric optical antennas"
When May 01, 2017
from 11:00 AM to 12:00 PM
Where CDI 4th floor seminar room
Contact Name
Contact Phone 212-650-7443
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"Recent progress in all-dielectric optical antennas"

Dr. Pavel Belov
ITMO University, Dept. of Nanophotonics and Memamaterials,  St. Petersburg 197101, Russia

We suggest and verify experimentally a novel type of optical nanoantennas made of high-permittivity low-loss dielectric spheres. In addition to the electric resonances, they exhibit very strong magnetic resonances at the nanoscale. By placing a point-like dipole source near a single dielectric particle driven at the magnetic resonance results the radiation pattern similar to that of a Huygens source with the enhanced forward and vanishing backward emission. This feature can be employed in the Yagi-Uda geometry for highly efficient optical nanoantennas

We introduce a novel concept of superdirective nanoantennas based on the generation of higher-order optically-induced magnetic multipoles. Such an all-dielectric nanoantenna can be realized as an optically small spherical dielectric nanoparticle with a notch excited by a point source located in the notch. We also confirm the predicted superdirectivity effect experimentally through scaling to the microwave frequency range.