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Shape Dependent EMA Model of Nanostructured Anisotropic Materials
Heterogeneous nanostructures containing nanoparticles of various sizes and shapes have attracted significant attention in the development of nano-biosensors. Especially, plasmonic properties of such materials are advantageously exploited for the detection of biological and chemical substances. Since...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6835424/ https://www.ncbi.nlm.nih.gov/pubmed/31561581 http://dx.doi.org/10.3390/nano9101380 |
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author | Otipka, Petr Vlček, Jaroslav |
author_facet | Otipka, Petr Vlček, Jaroslav |
author_sort | Otipka, Petr |
collection | PubMed |
description | Heterogeneous nanostructures containing nanoparticles of various sizes and shapes have attracted significant attention in the development of nano-biosensors. Especially, plasmonic properties of such materials are advantageously exploited for the detection of biological and chemical substances. Since these media exhibit optical anisotropy, a valid homogenization procedure must be able to describe appropriately the relationship between the geometry of the inclusions and the nature of local field modes. We present a model approach for extension of the effective medium approximation (EMA) and its application to anisotropic nanostructures. The proposed model is based on a “strong-couple-dipole” (SCD) method including a volume-integral correction term in a Green tensor that enables to obtain more accurate representation of polarizability tensor. Derived depolarization factors for discs and bi-cone particles are compared with the early known shapes (spheroids, cylinders) and applied to nanostructures composed of the Fe or Au nanodots in polyacrylate. |
format | Online Article Text |
id | pubmed-6835424 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-68354242019-11-25 Shape Dependent EMA Model of Nanostructured Anisotropic Materials Otipka, Petr Vlček, Jaroslav Nanomaterials (Basel) Article Heterogeneous nanostructures containing nanoparticles of various sizes and shapes have attracted significant attention in the development of nano-biosensors. Especially, plasmonic properties of such materials are advantageously exploited for the detection of biological and chemical substances. Since these media exhibit optical anisotropy, a valid homogenization procedure must be able to describe appropriately the relationship between the geometry of the inclusions and the nature of local field modes. We present a model approach for extension of the effective medium approximation (EMA) and its application to anisotropic nanostructures. The proposed model is based on a “strong-couple-dipole” (SCD) method including a volume-integral correction term in a Green tensor that enables to obtain more accurate representation of polarizability tensor. Derived depolarization factors for discs and bi-cone particles are compared with the early known shapes (spheroids, cylinders) and applied to nanostructures composed of the Fe or Au nanodots in polyacrylate. MDPI 2019-09-26 /pmc/articles/PMC6835424/ /pubmed/31561581 http://dx.doi.org/10.3390/nano9101380 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Otipka, Petr Vlček, Jaroslav Shape Dependent EMA Model of Nanostructured Anisotropic Materials |
title | Shape Dependent EMA Model of Nanostructured Anisotropic Materials |
title_full | Shape Dependent EMA Model of Nanostructured Anisotropic Materials |
title_fullStr | Shape Dependent EMA Model of Nanostructured Anisotropic Materials |
title_full_unstemmed | Shape Dependent EMA Model of Nanostructured Anisotropic Materials |
title_short | Shape Dependent EMA Model of Nanostructured Anisotropic Materials |
title_sort | shape dependent ema model of nanostructured anisotropic materials |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6835424/ https://www.ncbi.nlm.nih.gov/pubmed/31561581 http://dx.doi.org/10.3390/nano9101380 |
work_keys_str_mv | AT otipkapetr shapedependentemamodelofnanostructuredanisotropicmaterials AT vlcekjaroslav shapedependentemamodelofnanostructuredanisotropicmaterials |