Grating Theory Approach to Optics of Nanocomposites

Nanocomposites, i.e., materials comprising nano-sized entities embedded in a host matrix, can have tailored optical properties with applications in diverse fields such as photovoltaics, bio-sensing, and nonlinear optics. Effective medium approaches such as Maxwell-Garnett and Bruggemann theories, wh...

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Autores principales:	Subhajit Bej, Toni Saastamoinen, Yuri P. Svirko, Jari Turunen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nanocomposites grating theory Fourier Modal Method novel nonlinear materials deterministic aperiodic media metasurface Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/5b24d34f09cb461abb5d8f49b28879af
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spelling	oai:doaj.org-article:5b24d34f09cb461abb5d8f49b28879af2021-11-11T17:55:50ZGrating Theory Approach to Optics of Nanocomposites10.3390/ma142163591996-1944https://doaj.org/article/5b24d34f09cb461abb5d8f49b28879af2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6359https://doaj.org/toc/1996-1944Nanocomposites, i.e., materials comprising nano-sized entities embedded in a host matrix, can have tailored optical properties with applications in diverse fields such as photovoltaics, bio-sensing, and nonlinear optics. Effective medium approaches such as Maxwell-Garnett and Bruggemann theories, which are conventionally used for modeling the optical properties of nanocomposites, have limitations in terms of the shapes, volume fill fractions, sizes, and types of the nanoentities embedded in the host medium. We demonstrate that grating theory, in particular the Fourier Eigenmode Method, offers a viable alternative. The proposed technique based on grating theory presents nanocomposites as periodic structures composed of unit-cells containing a large and random collection of nanoentities. This approach allows us to include the effects of the finite wavelength of light and calculate the nanocomposite characteristics regardless of the morphology and volume fill fraction of the nano-inclusions. We demonstrate the performance of our approach by calculating the birefringence of porous silicon, linear absorption spectra of silver nanospheres arranged on a glass substrate, and nonlinear absorption spectra for a layer of silver nanorods embedded in a host polymer material having Kerr-type nonlinearity. The developed approach can also be applied to quasi-periodic structures with deterministic randomness or metasurfaces containing a large collection of elements with random arrangements inside their unit cells.Subhajit BejToni SaastamoinenYuri P. SvirkoJari TurunenMDPI AGarticlenanocompositesgrating theoryFourier Modal Methodnovel nonlinear materialsdeterministic aperiodic mediametasurfaceTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6359, p 6359 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nanocomposites grating theory Fourier Modal Method novel nonlinear materials deterministic aperiodic media metasurface Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	nanocomposites grating theory Fourier Modal Method novel nonlinear materials deterministic aperiodic media metasurface Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Subhajit Bej Toni Saastamoinen Yuri P. Svirko Jari Turunen Grating Theory Approach to Optics of Nanocomposites
description	Nanocomposites, i.e., materials comprising nano-sized entities embedded in a host matrix, can have tailored optical properties with applications in diverse fields such as photovoltaics, bio-sensing, and nonlinear optics. Effective medium approaches such as Maxwell-Garnett and Bruggemann theories, which are conventionally used for modeling the optical properties of nanocomposites, have limitations in terms of the shapes, volume fill fractions, sizes, and types of the nanoentities embedded in the host medium. We demonstrate that grating theory, in particular the Fourier Eigenmode Method, offers a viable alternative. The proposed technique based on grating theory presents nanocomposites as periodic structures composed of unit-cells containing a large and random collection of nanoentities. This approach allows us to include the effects of the finite wavelength of light and calculate the nanocomposite characteristics regardless of the morphology and volume fill fraction of the nano-inclusions. We demonstrate the performance of our approach by calculating the birefringence of porous silicon, linear absorption spectra of silver nanospheres arranged on a glass substrate, and nonlinear absorption spectra for a layer of silver nanorods embedded in a host polymer material having Kerr-type nonlinearity. The developed approach can also be applied to quasi-periodic structures with deterministic randomness or metasurfaces containing a large collection of elements with random arrangements inside their unit cells.
format	article
author	Subhajit Bej Toni Saastamoinen Yuri P. Svirko Jari Turunen
author_facet	Subhajit Bej Toni Saastamoinen Yuri P. Svirko Jari Turunen
author_sort	Subhajit Bej
title	Grating Theory Approach to Optics of Nanocomposites
title_short	Grating Theory Approach to Optics of Nanocomposites
title_full	Grating Theory Approach to Optics of Nanocomposites
title_fullStr	Grating Theory Approach to Optics of Nanocomposites
title_full_unstemmed	Grating Theory Approach to Optics of Nanocomposites
title_sort	grating theory approach to optics of nanocomposites
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5b24d34f09cb461abb5d8f49b28879af
work_keys_str_mv	AT subhajitbej gratingtheoryapproachtoopticsofnanocomposites AT tonisaastamoinen gratingtheoryapproachtoopticsofnanocomposites AT yuripsvirko gratingtheoryapproachtoopticsofnanocomposites AT jariturunen gratingtheoryapproachtoopticsofnanocomposites
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Grating Theory Approach to Optics of Nanocomposites

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