Dielectric Yagi-Uda nanoantennas driven by electron-hole plasma photoexcitation

All-dielectric nanophotonics based on high-index dielectric nanoparticles became a powerful platform for modern light science, providing many fascinating applications, including high-efficient nanoantennas and metamaterials. High-index dielectric nanostructures are of a special interest for nonlinea...

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Bibliographic Details
Main Authors: Li, S, Lepeshov, S, Savelev, R, Baranov, D, Belov, P, Krasnok, A
Format: Conference Proceeding
Language:English
Subjects:
Dielectrics
Electric dipoles
Electrons
Holes (electron deficiencies)
Metamaterials
Nanoantennas
Nanoparticles
Nanostructure
Nonlinearity
Photoexcitation
Physics
Tuning
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Summary:All-dielectric nanophotonics based on high-index dielectric nanoparticles became a powerful platform for modern light science, providing many fascinating applications, including high-efficient nanoantennas and metamaterials. High-index dielectric nanostructures are of a special interest for nonlinear nanophotonics, where they demonstrate special types of optical nonlinearity, such as electron-hole plasma photoexcitation, which are not inherent to plasmonic nanostructures. Here, we propose a novel type of highly tunable all-dielectric Yagi-Uda nanoantennas, consisting of a chain of Si nanoparticles exciting by an electric dipole source, which allow tuning of their radiating properties via electron-hole plasma photoexcitation. We theoretically and numerically demonstrate the tuning of radiation power patterns and the Purcell effect by additional pumping of several boundary nanoparticles with relatively low peak intensities of fs-laser.
ISSN:1742-6588
1742-6596
1742-6596
DOI:10.1088/1742-6596/917/6/062054