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Laser induced enhancement of dichroism in supported silver nanoparticles deposited by evaporation at glancing angles

Opened Access Laser induced enhancement of dichroism in supported silver nanoparticles deposited by evaporation at glancing angles

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Autor: Filippin Emilio, Alejandro Nicolás
Borrás Martos, Ana Isabel
Rico Gavira, Víctor Joaquín
Frutos Rayego, Fabián
Rodríguez González Elipe, Agustín
Departamento: Universidad de Sevilla. Departamento de Física Aplicada I
Fecha: 2013
Publicado en: Nanotechnology (24), 10 pp.
Tipo de documento: Artículo
Resumen: were deposited on flat substrates by physical vapor deposition in a glancing angle configuration. The particles were characterized by scanning electron microscopy and atomic force microscopy and their optical properties examined by UV–vis absorption spectroscopy using linearly polarized light. It was found that, depending on the amount of deposited silver and the evaporation angle, part of the ‘as-prepared’ samples present NPs characterized by an anisotropic shape and a polarization dependent SPR absorption and different colors when using polarized white light at 0 and 90 . Low-power irradiation of these materials with an infrared Nd-YAG nanosecond laser in ambient conditions produced an enhancement in such dichroism. At higher powers, the dichroism was lost and the SPR bands shifted to lower wavelengths as a result of the reshaping of the silver NPs in the form of spheres. The possible factors contributing to the observed changes in dichroism are discussed.
Tamaño: 2.282Mb
Formato: PDF

URI: http://hdl.handle.net/11441/30730

DOI: http://dx.doi.org/10.1088/0957-4484/24/4/045301

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