Annular nanoplasmonic void arrays as tunable surface enhanced Raman spectroscopy substrates

Li, Z., Clark, A. W. and Cooper, J. (2014) Annular nanoplasmonic void arrays as tunable surface enhanced Raman spectroscopy substrates. Applied Physics Letters, 105(3), 033115. (doi: 10.1063/1.4891537)

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We report the use of annular nano-voids in a metallic thin-film as programmable molecular sensors for surface-enhanced Raman spectroscopy (SERS). To date, research into these structures has focused on the exploration of their extraordinary optical transmission attributes. We now show that by using advanced lithography and simulation tools, we can generate a porous SERS material for molecular interrogation. Using ultra-thin annular structures, rather than simple circular holes, allows us to reduce both the volume and cross-sectional area of the void, maximizing the electric-field confinement, while, importantly for SERS, producing resonant conditions in the visible region of the spectrum. By comparing our annular films with conventional circular films with the same resonant frequency, we show a significant improvement in the efficiency of Raman scatter, creating stronger signals that also contain more spectral information.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cooper, Professor Jonathan and Clark, Professor Alasdair
Authors: Li, Z., Clark, A. W., and Cooper, J.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Applied Physics Letters
Publisher:American Institute of Physics
ISSN (Online):1077-3118

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
561421Plasmon Enhanced Pyroelectric Nanoscale Trapping and SensingAlasdair ClarkThe Royal Academy of Engineering (RAE)10216/103ENG - BIOMEDICAL ENGINEERING