Structure of plasmonic aerogel and the breakdown of the effective medium approximation

Michael D W Grogan; Susannah C Heck; Katie M Hood; Stefan A Maier; Timothy A Birks

doi:10.1364/OL.36.000358

Structure of plasmonic aerogel and the breakdown of the effective medium approximation

Michael D W Grogan, Susannah C Heck, Katie M Hood, Stefan A Maier, Timothy A Birks

Department of Physics

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Abstract

A method for making aerogel doped with gold nanoparticles (GNPs) produces a composite material with a well-defined localized surface plasmon resonance peak at 520 nm. The width of the extinction feature indicates the GNPs are well dispersed in the aerogel, making it suited to optical study. A simple effective medium approximation cannot explain the peak extinction wavelengths. The plasmonic field extends on a scale where aerogel cannot be considered isotropic, so a new model is required: a 5nm glass coating on the GNPs models the extinction spectrum of the composite material, with air (aerogel), methanol (alcogel), or toluene filling the pores.

Original language	English
Pages (from-to)	358-360
Number of pages	3
Journal	Optics Letters
Volume	36
Issue number	3
DOIs	https://doi.org/10.1364/OL.36.000358
Publication status	Published - 1 Feb 2011

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Birks_OL_2011_36_3_358.pdf
© 2011 The Optical Society. This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OL.36.000358. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Cite this

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title = "Structure of plasmonic aerogel and the breakdown of the effective medium approximation",

abstract = "A method for making aerogel doped with gold nanoparticles (GNPs) produces a composite material with a well-defined localized surface plasmon resonance peak at 520 nm. The width of the extinction feature indicates the GNPs are well dispersed in the aerogel, making it suited to optical study. A simple effective medium approximation cannot explain the peak extinction wavelengths. The plasmonic field extends on a scale where aerogel cannot be considered isotropic, so a new model is required: a 5nm glass coating on the GNPs models the extinction spectrum of the composite material, with air (aerogel), methanol (alcogel), or toluene filling the pores.",

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Structure of plasmonic aerogel and the breakdown of the effective medium approximation

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Structure of plasmonic aerogel and the breakdown of the effective medium approximation

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