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Issue 19, 2012
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Tunable plasmon resonances in a metallic nanotip–film system

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Tip-enhanced Raman spectroscopy (TERS) has emerged as a powerful tool for optical imaging at nanoscale spatial resolution, and for investigating the vibrational properties of molecules adsorbed on a substrate. Plasmonic enhancement of the electromagnetic fields near a metallic nanostructure plays a very important role in TERS, where resonant excitation of plasmons is crucial. When two metallic nanostructures are placed at a gap of nanometric distance, their plasmons can interact with one other and result in hybridized shifted plasmon modes. Here, we apply this idea to TERS and demonstrate a significant tunability of the plasmon resonance enabling large electric field enhancement at a desired excitation wavelength. This finding paves the way for efficient optimization of TERS in imaging and spectroscopy applications.

Graphical abstract: Tunable plasmon resonances in a metallic nanotip–film system

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Publication details

The article was received on 19 Jun 2012, accepted on 23 Jul 2012 and first published on 26 Jul 2012

Article type: Paper
DOI: 10.1039/C2NR31542D
Citation: Nanoscale, 2012,4, 5931-5935
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    Tunable plasmon resonances in a metallic nanotip–film system

    K. Uetsuki, P. Verma, P. Nordlander and S. Kawata, Nanoscale, 2012, 4, 5931
    DOI: 10.1039/C2NR31542D

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