Core-shell particles as efficient broadband absorbers in infrared optical range

Andrey B. Evlyukhin*, Khachatur V. Nerkararyan, Sergey I. Bozhevolnyi

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Resumé

We demonstrate that efficient broadband absorption of infrared radiation can be obtained with deeply subwavelength spherical dielectric particles covered by a thin metal layer. Considerations based on Mie theory and the quasi-static approximation reveal a wide range of configuration parameters, within which the absorption cross section reaches the geometrical one and exceeds more than by order of magnitude the scattering cross section in the infrared spectrum. We show that the absorption is not only efficient but also broadband with the spectral width being close to the resonant wavelength corresponding to the maximum of the absorption cross section. We obtain a simple analytical expression for the absorption resonance that allows one to quickly identify the configuration parameters ensuring strong infrared absorption in a given spectral range. Relation between the absorption resonance and excitation of the short-range surface palsmon modes in the metal shell of particles is demonstrated and discussed. Our results can be used as practical guidelines for realization of efficient broadband infrared absorbers of subwavelength sizes desirable in diverse applications.

OriginalsprogEngelsk
TidsskriftOptics Express
Vol/bind27
Udgave nummer13
Sider (fra-til)17474-17481
ISSN1094-4087
DOI
StatusUdgivet - jun. 2019

Fingeraftryk

absorbers
broadband
absorption cross sections
metal shells
infrared radiation
Mie scattering
configurations
scattering cross sections
infrared absorption
infrared spectra
approximation
wavelengths
metals
excitation

Citer dette

Evlyukhin, Andrey B. ; Nerkararyan, Khachatur V. ; Bozhevolnyi, Sergey I. / Core-shell particles as efficient broadband absorbers in infrared optical range. I: Optics Express. 2019 ; Bind 27, Nr. 13. s. 17474-17481.
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abstract = "We demonstrate that efficient broadband absorption of infrared radiation can be obtained with deeply subwavelength spherical dielectric particles covered by a thin metal layer. Considerations based on Mie theory and the quasi-static approximation reveal a wide range of configuration parameters, within which the absorption cross section reaches the geometrical one and exceeds more than by order of magnitude the scattering cross section in the infrared spectrum. We show that the absorption is not only efficient but also broadband with the spectral width being close to the resonant wavelength corresponding to the maximum of the absorption cross section. We obtain a simple analytical expression for the absorption resonance that allows one to quickly identify the configuration parameters ensuring strong infrared absorption in a given spectral range. Relation between the absorption resonance and excitation of the short-range surface palsmon modes in the metal shell of particles is demonstrated and discussed. Our results can be used as practical guidelines for realization of efficient broadband infrared absorbers of subwavelength sizes desirable in diverse applications.",
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Core-shell particles as efficient broadband absorbers in infrared optical range. / Evlyukhin, Andrey B.; Nerkararyan, Khachatur V.; Bozhevolnyi, Sergey I.

I: Optics Express, Bind 27, Nr. 13, 06.2019, s. 17474-17481.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Core-shell particles as efficient broadband absorbers in infrared optical range

AU - Evlyukhin, Andrey B.

AU - Nerkararyan, Khachatur V.

AU - Bozhevolnyi, Sergey I.

PY - 2019/6

Y1 - 2019/6

N2 - We demonstrate that efficient broadband absorption of infrared radiation can be obtained with deeply subwavelength spherical dielectric particles covered by a thin metal layer. Considerations based on Mie theory and the quasi-static approximation reveal a wide range of configuration parameters, within which the absorption cross section reaches the geometrical one and exceeds more than by order of magnitude the scattering cross section in the infrared spectrum. We show that the absorption is not only efficient but also broadband with the spectral width being close to the resonant wavelength corresponding to the maximum of the absorption cross section. We obtain a simple analytical expression for the absorption resonance that allows one to quickly identify the configuration parameters ensuring strong infrared absorption in a given spectral range. Relation between the absorption resonance and excitation of the short-range surface palsmon modes in the metal shell of particles is demonstrated and discussed. Our results can be used as practical guidelines for realization of efficient broadband infrared absorbers of subwavelength sizes desirable in diverse applications.

AB - We demonstrate that efficient broadband absorption of infrared radiation can be obtained with deeply subwavelength spherical dielectric particles covered by a thin metal layer. Considerations based on Mie theory and the quasi-static approximation reveal a wide range of configuration parameters, within which the absorption cross section reaches the geometrical one and exceeds more than by order of magnitude the scattering cross section in the infrared spectrum. We show that the absorption is not only efficient but also broadband with the spectral width being close to the resonant wavelength corresponding to the maximum of the absorption cross section. We obtain a simple analytical expression for the absorption resonance that allows one to quickly identify the configuration parameters ensuring strong infrared absorption in a given spectral range. Relation between the absorption resonance and excitation of the short-range surface palsmon modes in the metal shell of particles is demonstrated and discussed. Our results can be used as practical guidelines for realization of efficient broadband infrared absorbers of subwavelength sizes desirable in diverse applications.

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DO - 10.1364/OE.27.017474

M3 - Journal article

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