Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies

Optical resonances arising from quasi-bound states in the continuum (QBICs) have been recently identified in nanostructured dielectrics, showing ultrahigh quality factors accompanied by very large electromagnetic field enhancements. In this work, we design a periodic array of gallium phosphide (GaP)...

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Autores principales:	Moretti Gianni Q., Cortés Emiliano, Maier Stefan A., Bragas Andrea V., Grinblat Gustavo
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bound states in the continuum degenerate four-wave mixing dielectric nanophotonics radiative enhancement second-harmonic generation Physics QC1-999
Acceso en línea:	https://doaj.org/article/fe317fbe01994a74bd83893b40f9523c
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spelling	oai:doaj.org-article:fe317fbe01994a74bd83893b40f9523c2021-12-05T14:10:56ZEngineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies2192-861410.1515/nanoph-2021-0388https://doaj.org/article/fe317fbe01994a74bd83893b40f9523c2021-09-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0388https://doaj.org/toc/2192-8614Optical resonances arising from quasi-bound states in the continuum (QBICs) have been recently identified in nanostructured dielectrics, showing ultrahigh quality factors accompanied by very large electromagnetic field enhancements. In this work, we design a periodic array of gallium phosphide (GaP) elliptical cylinders supporting, concurrently, three spectrally separated QBIC resonances with in-plane magnetic dipole, out-of-plane magnetic dipole, and electric quadrupole characters. We numerically explore this system for second-harmonic generation and degenerate four-wave mixing, demonstrating giant per unit cell conversion efficiencies of up to ∼ 2 W−1 and ∼ 60 W−2, respectively, when considering realistic introduced asymmetries in the metasurface, compatible with current fabrication limitations. We find that this configuration outperforms by up to more than four orders of magnitude the response of low-Q Mie or anapole resonances in individual GaP nanoantennas with engineered nonlinear mode-matching conditions. Benefiting from the straight-oriented electric field of one of the examined high-Q resonances, we further propose a novel nanocavity design for enhanced spectroscopies by slotting the meta-atoms of the periodic array. We discover that the optical cavity sustains high-intensity fields homogeneously distributed inside the slot, delivering its best performance when the elliptical cylinders are cut from end to end forming a gap, which represents a convenient model for experimental investigations. When placing an electric point dipole inside the added aperture, we find that the metasurface offers ultrahigh radiative enhancements, exceeding the previously reported slotted dielectric nanodisk at the anapole excitation by more than two orders of magnitude.Moretti Gianni Q.Cortés EmilianoMaier Stefan A.Bragas Andrea V.Grinblat GustavoDe Gruyterarticlebound states in the continuumdegenerate four-wave mixingdielectric nanophotonicsradiative enhancementsecond-harmonic generationPhysicsQC1-999ENNanophotonics, Vol 10, Iss 17, Pp 4261-4271 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bound states in the continuum degenerate four-wave mixing dielectric nanophotonics radiative enhancement second-harmonic generation Physics QC1-999
spellingShingle	bound states in the continuum degenerate four-wave mixing dielectric nanophotonics radiative enhancement second-harmonic generation Physics QC1-999 Moretti Gianni Q. Cortés Emiliano Maier Stefan A. Bragas Andrea V. Grinblat Gustavo Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies
description	Optical resonances arising from quasi-bound states in the continuum (QBICs) have been recently identified in nanostructured dielectrics, showing ultrahigh quality factors accompanied by very large electromagnetic field enhancements. In this work, we design a periodic array of gallium phosphide (GaP) elliptical cylinders supporting, concurrently, three spectrally separated QBIC resonances with in-plane magnetic dipole, out-of-plane magnetic dipole, and electric quadrupole characters. We numerically explore this system for second-harmonic generation and degenerate four-wave mixing, demonstrating giant per unit cell conversion efficiencies of up to ∼ 2 W−1 and ∼ 60 W−2, respectively, when considering realistic introduced asymmetries in the metasurface, compatible with current fabrication limitations. We find that this configuration outperforms by up to more than four orders of magnitude the response of low-Q Mie or anapole resonances in individual GaP nanoantennas with engineered nonlinear mode-matching conditions. Benefiting from the straight-oriented electric field of one of the examined high-Q resonances, we further propose a novel nanocavity design for enhanced spectroscopies by slotting the meta-atoms of the periodic array. We discover that the optical cavity sustains high-intensity fields homogeneously distributed inside the slot, delivering its best performance when the elliptical cylinders are cut from end to end forming a gap, which represents a convenient model for experimental investigations. When placing an electric point dipole inside the added aperture, we find that the metasurface offers ultrahigh radiative enhancements, exceeding the previously reported slotted dielectric nanodisk at the anapole excitation by more than two orders of magnitude.
format	article
author	Moretti Gianni Q. Cortés Emiliano Maier Stefan A. Bragas Andrea V. Grinblat Gustavo
author_facet	Moretti Gianni Q. Cortés Emiliano Maier Stefan A. Bragas Andrea V. Grinblat Gustavo
author_sort	Moretti Gianni Q.
title	Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies
title_short	Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies
title_full	Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies
title_fullStr	Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies
title_full_unstemmed	Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies
title_sort	engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/fe317fbe01994a74bd83893b40f9523c
work_keys_str_mv	AT morettigianniq engineeringgalliumphosphidenanostructuresforefficientnonlinearphotonicsandenhancedspectroscopies AT cortesemiliano engineeringgalliumphosphidenanostructuresforefficientnonlinearphotonicsandenhancedspectroscopies AT maierstefana engineeringgalliumphosphidenanostructuresforefficientnonlinearphotonicsandenhancedspectroscopies AT bragasandreav engineeringgalliumphosphidenanostructuresforefficientnonlinearphotonicsandenhancedspectroscopies AT grinblatgustavo engineeringgalliumphosphidenanostructuresforefficientnonlinearphotonicsandenhancedspectroscopies
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Engineering gallium phosphide nanostructures for efficient nonlinear photonics and enhanced spectroscopies

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