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; Tim 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, Tim A. Birks

Research output: Contribution to journal › Article › Research › peer-review

7 Citations (Scopus)

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
Externally published	Yes

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AU - Birks, Tim A.

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AB - 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

Abstract

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