Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide
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Publication Date: | 2014 |
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Format: | Article |
Language: | eng |
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Download full: | http://hdl.handle.net/10183/107184 |
Summary: | Films containing a layer of Ag nanoparticles embedded in silicon dioxide were produced by RF magnetron sputtering. Optical transmittance measurements at several angles of incidence (from normal to 75°) revealed two surface plasmon resonance (SPR) peaks, which depend on electric field direction: one in the ultraviolet and another red-shifted from the dilute Ag∕SiO2 system resonance at 410 nm. In order to investigate the origin of this anisotropic behavior, the structural properties were determined by transmission electron microscopy, revealing the bidimensional plane distribution of Ag nanoparticles with nearly spherical shape as well as the filling factor of metal in the composite. A simple model linked to these experimental parameters allowed description of the most relevant features of the SPR positions, which, depending on the field direction, were distinctly affected by the coupling of oscillations between close nanoparticles, as described by a modified Drude–Lorentz dielectric function introduced into the Maxwell–Garnett relation. This approach allowed prediction of the resonance for light at 75° incidence from the SPR position for light at normal incidence, in good agreement with experimental observation. |
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Menegotto, ThiagoHorowitz, Flavio2014-11-20T02:15:55Z20141559-128Xhttp://hdl.handle.net/10183/107184000919387Films containing a layer of Ag nanoparticles embedded in silicon dioxide were produced by RF magnetron sputtering. Optical transmittance measurements at several angles of incidence (from normal to 75°) revealed two surface plasmon resonance (SPR) peaks, which depend on electric field direction: one in the ultraviolet and another red-shifted from the dilute Ag∕SiO2 system resonance at 410 nm. In order to investigate the origin of this anisotropic behavior, the structural properties were determined by transmission electron microscopy, revealing the bidimensional plane distribution of Ag nanoparticles with nearly spherical shape as well as the filling factor of metal in the composite. A simple model linked to these experimental parameters allowed description of the most relevant features of the SPR positions, which, depending on the field direction, were distinctly affected by the coupling of oscillations between close nanoparticles, as described by a modified Drude–Lorentz dielectric function introduced into the Maxwell–Garnett relation. This approach allowed prediction of the resonance for light at 75° incidence from the SPR position for light at normal incidence, in good agreement with experimental observation.application/pdfengApplied optics (2004). Washington, DC. Vol. 53, no. 13 (Mar. 2014), p. 2853-2859Filmes finosNanopartículasPropriedades óticasPlasmas de superfícieDióxido de silícioPrataAnisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxideEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000919387.pdf000919387.pdfTexto completo (inglês)application/pdf615112http://www.lume.ufrgs.br/bitstream/10183/107184/1/000919387.pdf73c1467e49211d99aa36bb5e1ea4cec3MD51TEXT000919387.pdf.txt000919387.pdf.txtExtracted Texttext/plain31214http://www.lume.ufrgs.br/bitstream/10183/107184/2/000919387.pdf.txta1364b98948a23b4ec5b70fd7395e23eMD52THUMBNAIL000919387.pdf.jpg000919387.pdf.jpgGenerated Thumbnailimage/jpeg1731http://www.lume.ufrgs.br/bitstream/10183/107184/3/000919387.pdf.jpg3307750a35ffe34d9060afe958e754deMD5310183/1071842023-03-19 03:34:20.173126oai:www.lume.ufrgs.br:10183/107184Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-03-19T06:34:20Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide |
title |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide |
spellingShingle |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide Menegotto, Thiago Filmes finos Nanopartículas Propriedades óticas Plasmas de superfície Dióxido de silício Prata |
title_short |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide |
title_full |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide |
title_fullStr |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide |
title_full_unstemmed |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide |
title_sort |
Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide |
author |
Menegotto, Thiago |
author_facet |
Menegotto, Thiago Horowitz, Flavio |
author_role |
author |
author2 |
Horowitz, Flavio |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Menegotto, Thiago Horowitz, Flavio |
dc.subject.por.fl_str_mv |
Filmes finos Nanopartículas Propriedades óticas Plasmas de superfície Dióxido de silício Prata |
topic |
Filmes finos Nanopartículas Propriedades óticas Plasmas de superfície Dióxido de silício Prata |
description |
Films containing a layer of Ag nanoparticles embedded in silicon dioxide were produced by RF magnetron sputtering. Optical transmittance measurements at several angles of incidence (from normal to 75°) revealed two surface plasmon resonance (SPR) peaks, which depend on electric field direction: one in the ultraviolet and another red-shifted from the dilute Ag∕SiO2 system resonance at 410 nm. In order to investigate the origin of this anisotropic behavior, the structural properties were determined by transmission electron microscopy, revealing the bidimensional plane distribution of Ag nanoparticles with nearly spherical shape as well as the filling factor of metal in the composite. A simple model linked to these experimental parameters allowed description of the most relevant features of the SPR positions, which, depending on the field direction, were distinctly affected by the coupling of oscillations between close nanoparticles, as described by a modified Drude–Lorentz dielectric function introduced into the Maxwell–Garnett relation. This approach allowed prediction of the resonance for light at 75° incidence from the SPR position for light at normal incidence, in good agreement with experimental observation. |
publishDate |
2014 |
dc.date.accessioned.fl_str_mv |
2014-11-20T02:15:55Z |
dc.date.issued.fl_str_mv |
2014 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
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publishedVersion |
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http://hdl.handle.net/10183/107184 |
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1559-128X |
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000919387 |
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http://hdl.handle.net/10183/107184 |
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eng |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Applied optics (2004). Washington, DC. Vol. 53, no. 13 (Mar. 2014), p. 2853-2859 |
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openAccess |
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