Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters

Abstract Silver nanorod arrays prepared by oblique angle deposition (AgOADs) represent versatile, simple and inexpensive substrates for high sensitivity surface enhanced Raman scattering (SERS) applications. Their anisotropic nature suggests that their optical responses such as the SERS signal, the...

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Autores principales:	Martin Šubr, Martin Petr, Ondřej Kylián, Josef Štěpánek, Martin Veis, Marek Procházka
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ed076bcfd5d8483e86efebf7ad4121ac
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spelling	oai:doaj.org-article:ed076bcfd5d8483e86efebf7ad4121ac2021-12-02T12:32:49ZAnisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters10.1038/s41598-017-04565-02045-2322https://doaj.org/article/ed076bcfd5d8483e86efebf7ad4121ac2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04565-0https://doaj.org/toc/2045-2322Abstract Silver nanorod arrays prepared by oblique angle deposition (AgOADs) represent versatile, simple and inexpensive substrates for high sensitivity surface enhanced Raman scattering (SERS) applications. Their anisotropic nature suggests that their optical responses such as the SERS signal, the depolarization ratio, reflectivity and ellipsometric parameters critically depend on the states of polarization, nanorod angular arrangement and specific illumination-observation geometry. SERS polarization and angular dependences of AgOADs were measured using methylene blue (MB) molecule. Our study constitutes, to our knowledge, the most detailed investigation of such characteristics of plasmonic nanostructures to date. This is due to the 90°-scattering geometry used in which two out of three Euler angles determining the nanorod spatial orientation and four polarization combinations can be varied simultaneously. We attributed the anisotropic optical response to anisotropic (pseudo)refractive index caused by different periodicity of our structures in different directions since the plasmonic properties were found rather isotropic. For the first time we demonstrate very good correspondence between SERS intensities and ellipsometric parameters for all measured configurations as compared on the basis of the surface selection rules. Obtained results enable quantitative analysis of MB Raman tensor elements, indicating that the molecules adsorb predominantly with the symmetry axis perpendicular to the surface.Martin ŠubrMartin PetrOndřej KyliánJosef ŠtěpánekMartin VeisMarek ProcházkaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Martin Šubr Martin Petr Ondřej Kylián Josef Štěpánek Martin Veis Marek Procházka Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters
description	Abstract Silver nanorod arrays prepared by oblique angle deposition (AgOADs) represent versatile, simple and inexpensive substrates for high sensitivity surface enhanced Raman scattering (SERS) applications. Their anisotropic nature suggests that their optical responses such as the SERS signal, the depolarization ratio, reflectivity and ellipsometric parameters critically depend on the states of polarization, nanorod angular arrangement and specific illumination-observation geometry. SERS polarization and angular dependences of AgOADs were measured using methylene blue (MB) molecule. Our study constitutes, to our knowledge, the most detailed investigation of such characteristics of plasmonic nanostructures to date. This is due to the 90°-scattering geometry used in which two out of three Euler angles determining the nanorod spatial orientation and four polarization combinations can be varied simultaneously. We attributed the anisotropic optical response to anisotropic (pseudo)refractive index caused by different periodicity of our structures in different directions since the plasmonic properties were found rather isotropic. For the first time we demonstrate very good correspondence between SERS intensities and ellipsometric parameters for all measured configurations as compared on the basis of the surface selection rules. Obtained results enable quantitative analysis of MB Raman tensor elements, indicating that the molecules adsorb predominantly with the symmetry axis perpendicular to the surface.
format	article
author	Martin Šubr Martin Petr Ondřej Kylián Josef Štěpánek Martin Veis Marek Procházka
author_facet	Martin Šubr Martin Petr Ondřej Kylián Josef Štěpánek Martin Veis Marek Procházka
author_sort	Martin Šubr
title	Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters
title_short	Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters
title_full	Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters
title_fullStr	Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters
title_full_unstemmed	Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters
title_sort	anisotropic optical response of silver nanorod arrays: surface enhanced raman scattering polarization and angular dependences confronted with ellipsometric parameters
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ed076bcfd5d8483e86efebf7ad4121ac
work_keys_str_mv	AT martinsubr anisotropicopticalresponseofsilvernanorodarrayssurfaceenhancedramanscatteringpolarizationandangulardependencesconfrontedwithellipsometricparameters AT martinpetr anisotropicopticalresponseofsilvernanorodarrayssurfaceenhancedramanscatteringpolarizationandangulardependencesconfrontedwithellipsometricparameters AT ondrejkylian anisotropicopticalresponseofsilvernanorodarrayssurfaceenhancedramanscatteringpolarizationandangulardependencesconfrontedwithellipsometricparameters AT josefstepanek anisotropicopticalresponseofsilvernanorodarrayssurfaceenhancedramanscatteringpolarizationandangulardependencesconfrontedwithellipsometricparameters AT martinveis anisotropicopticalresponseofsilvernanorodarrayssurfaceenhancedramanscatteringpolarizationandangulardependencesconfrontedwithellipsometricparameters AT marekprochazka anisotropicopticalresponseofsilvernanorodarrayssurfaceenhancedramanscatteringpolarizationandangulardependencesconfrontedwithellipsometricparameters
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Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters

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