A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window

Abstract In this work, the optical properties of asymmetric nanoshells with different geometries are comprehensively investigated in the quasi-static regime by applying the dipolar model and effective medium theory. The plasmonic behaviors of these nanostructures are explained by the plasmon hybridi...

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Autores principales:	Somayeh Souri, Naby Hadilou, H. A. Navid, Rasoul Sadighi Bonabi, Abbas Anvari
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/560f8f226c374c34a4f7cdd58d3a519e
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spelling	oai:doaj.org-article:560f8f226c374c34a4f7cdd58d3a519e2021-12-02T17:55:04ZA rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window10.1038/s41598-021-94409-92045-2322https://doaj.org/article/560f8f226c374c34a4f7cdd58d3a519e2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94409-9https://doaj.org/toc/2045-2322Abstract In this work, the optical properties of asymmetric nanoshells with different geometries are comprehensively investigated in the quasi-static regime by applying the dipolar model and effective medium theory. The plasmonic behaviors of these nanostructures are explained by the plasmon hybridization model. Asymmetric hybrid nanoshells, composed of off-center core or nanorod core surrounded by a spherical metallic shell layer possess highly geometrically tunable optical resonances in the near-infrared regime. The plasmon modes of this nanostructures arise from the hybridization of the cavity and solid plasmon modes at the inner and outer surfaces of the shell. The results reveal that the symmetry breaking drastically affects the strength of hybridization between plasmon modes, which ultimately affects the absorption spectrum by altering the number of resonance modes, their wavelengths and absorption efficiencies. Therefore, offsetting the spherical core as well as changing the internal geometry of the nanoparticle to nanorod not only shift the resonance frequencies but can also strongly modify the relative magnitudes of the absorption efficiencies. Furthermore, higher order multipolar plasmon modes can appear in the spectrum of asymmetric nanoshell, especially in nanoegg configuration. The results also indicate that the strength of hybridization strongly depends on the metal of shell, material of core and the filling factor. Using Au-Ag alloy as a material of the shell can provide red-shifted narrow resonance peak in the near-infrared regime by combining the specific features of gold and silver. Moreover, inserting a high permittivity core in a nanoshell corresponds to a red-shift, while a core with small dielectric constant results in a blue-shift of spectrum. We envision that this research offers a novel perspective and provides a practical guideline in the fabrication of efficient tunable absorbers in the nanoscale regime.Somayeh SouriNaby HadilouH. A. NavidRasoul Sadighi BonabiAbbas AnvariNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Somayeh Souri Naby Hadilou H. A. Navid Rasoul Sadighi Bonabi Abbas Anvari A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window
description	Abstract In this work, the optical properties of asymmetric nanoshells with different geometries are comprehensively investigated in the quasi-static regime by applying the dipolar model and effective medium theory. The plasmonic behaviors of these nanostructures are explained by the plasmon hybridization model. Asymmetric hybrid nanoshells, composed of off-center core or nanorod core surrounded by a spherical metallic shell layer possess highly geometrically tunable optical resonances in the near-infrared regime. The plasmon modes of this nanostructures arise from the hybridization of the cavity and solid plasmon modes at the inner and outer surfaces of the shell. The results reveal that the symmetry breaking drastically affects the strength of hybridization between plasmon modes, which ultimately affects the absorption spectrum by altering the number of resonance modes, their wavelengths and absorption efficiencies. Therefore, offsetting the spherical core as well as changing the internal geometry of the nanoparticle to nanorod not only shift the resonance frequencies but can also strongly modify the relative magnitudes of the absorption efficiencies. Furthermore, higher order multipolar plasmon modes can appear in the spectrum of asymmetric nanoshell, especially in nanoegg configuration. The results also indicate that the strength of hybridization strongly depends on the metal of shell, material of core and the filling factor. Using Au-Ag alloy as a material of the shell can provide red-shifted narrow resonance peak in the near-infrared regime by combining the specific features of gold and silver. Moreover, inserting a high permittivity core in a nanoshell corresponds to a red-shift, while a core with small dielectric constant results in a blue-shift of spectrum. We envision that this research offers a novel perspective and provides a practical guideline in the fabrication of efficient tunable absorbers in the nanoscale regime.
format	article
author	Somayeh Souri Naby Hadilou H. A. Navid Rasoul Sadighi Bonabi Abbas Anvari
author_facet	Somayeh Souri Naby Hadilou H. A. Navid Rasoul Sadighi Bonabi Abbas Anvari
author_sort	Somayeh Souri
title	A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window
title_short	A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window
title_full	A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window
title_fullStr	A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window
title_full_unstemmed	A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window
title_sort	rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/560f8f226c374c34a4f7cdd58d3a519e
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A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window

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