$Fourier-component engineering to control light diffraction beyond subwavelength limit$
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Fourier-component engineering to control light diffraction beyond subwavelength limit

Resonant physical phenomena in planar photonic lattices, such as bound states in the continuum (BICs) and Fano resonances with 100% diffraction efficiency, have garnered significant scientific interest in recent years owing to their great ability to manipulate electromagnetic waves. In conventional...

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Autores principales:	Lee Sun-Goo, Kim Seong-Han, Kee Chul-Sik
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bound state in the continuum diffraction fano resonance fourier component metasurface Physics QC1-999
Acceso en línea:	https://doaj.org/article/8c8aafe2d974427b80932aebd087e2f3
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id	oai:doaj.org-article:8c8aafe2d974427b80932aebd087e2f3
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spelling	oai:doaj.org-article:8c8aafe2d974427b80932aebd087e2f32021-12-05T14:10:56ZFourier-component engineering to control light diffraction beyond subwavelength limit2192-861410.1515/nanoph-2021-0438https://doaj.org/article/8c8aafe2d974427b80932aebd087e2f32021-09-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0438https://doaj.org/toc/2192-8614Resonant physical phenomena in planar photonic lattices, such as bound states in the continuum (BICs) and Fano resonances with 100% diffraction efficiency, have garnered significant scientific interest in recent years owing to their great ability to manipulate electromagnetic waves. In conventional diffraction theory, a subwavelength period is considered a prerequisite to achieving the highly efficient resonant physical phenomena. Indeed, most of the previous studies, that treat anomalous resonance effects, utilize quasiguided Bloch modes at the second stop bands open in the subwavelength region. Higher (beyond the second) stop bands open beyond the subwavelength limit have attracted little attention thus far. In principle, resonant diffraction phenomena are governed by the superposition of scattering processes, owing to higher Fourier harmonic components of periodic modulations in lattice parameters. But only some of Fourier components are dominant at band edges with Bragg conditions. Here, we present new principles of light diffraction, that enable identification of the dominant Fourier components causing multiple diffraction orders at the higher stopbands, and show that unwanted diffraction orders can be suppressed by engineering the dominant Fourier components. Based on the new diffraction principles, novel Fourier-component-engineered (FCE) metasurfaces are introduced and analyzed. It is demonstrated that these FCE metasurfaces with appropriately engineered spatial dielectric functions can exhibit BICs and highly efficient Fano resonances even beyond the subwavelength limit.Lee Sun-GooKim Seong-HanKee Chul-SikDe Gruyterarticlebound state in the continuumdiffractionfano resonancefourier componentmetasurfacePhysicsQC1-999ENNanophotonics, Vol 10, Iss 15, Pp 3917-3925 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bound state in the continuum diffraction fano resonance fourier component metasurface Physics QC1-999
spellingShingle	bound state in the continuum diffraction fano resonance fourier component metasurface Physics QC1-999 Lee Sun-Goo Kim Seong-Han Kee Chul-Sik Fourier-component engineering to control light diffraction beyond subwavelength limit
description	Resonant physical phenomena in planar photonic lattices, such as bound states in the continuum (BICs) and Fano resonances with 100% diffraction efficiency, have garnered significant scientific interest in recent years owing to their great ability to manipulate electromagnetic waves. In conventional diffraction theory, a subwavelength period is considered a prerequisite to achieving the highly efficient resonant physical phenomena. Indeed, most of the previous studies, that treat anomalous resonance effects, utilize quasiguided Bloch modes at the second stop bands open in the subwavelength region. Higher (beyond the second) stop bands open beyond the subwavelength limit have attracted little attention thus far. In principle, resonant diffraction phenomena are governed by the superposition of scattering processes, owing to higher Fourier harmonic components of periodic modulations in lattice parameters. But only some of Fourier components are dominant at band edges with Bragg conditions. Here, we present new principles of light diffraction, that enable identification of the dominant Fourier components causing multiple diffraction orders at the higher stopbands, and show that unwanted diffraction orders can be suppressed by engineering the dominant Fourier components. Based on the new diffraction principles, novel Fourier-component-engineered (FCE) metasurfaces are introduced and analyzed. It is demonstrated that these FCE metasurfaces with appropriately engineered spatial dielectric functions can exhibit BICs and highly efficient Fano resonances even beyond the subwavelength limit.
format	article
author	Lee Sun-Goo Kim Seong-Han Kee Chul-Sik
author_facet	Lee Sun-Goo Kim Seong-Han Kee Chul-Sik
author_sort	Lee Sun-Goo
title	Fourier-component engineering to control light diffraction beyond subwavelength limit
title_short	Fourier-component engineering to control light diffraction beyond subwavelength limit
title_full	Fourier-component engineering to control light diffraction beyond subwavelength limit
title_fullStr	Fourier-component engineering to control light diffraction beyond subwavelength limit
title_full_unstemmed	Fourier-component engineering to control light diffraction beyond subwavelength limit
title_sort	fourier-component engineering to control light diffraction beyond subwavelength limit
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/8c8aafe2d974427b80932aebd087e2f3
work_keys_str_mv	AT leesungoo fouriercomponentengineeringtocontrollightdiffractionbeyondsubwavelengthlimit AT kimseonghan fouriercomponentengineeringtocontrollightdiffractionbeyondsubwavelengthlimit AT keechulsik fouriercomponentengineeringtocontrollightdiffractionbeyondsubwavelengthlimit
_version_	1718371553572290560

Fourier-component engineering to control light diffraction beyond subwavelength limit

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