Sensitivity of Collective Plasmon Modes of Gold Nanoresonators to Local Environment

Details Sensitivity of Collective Plasmon Modes of Gold Nanoresonators to Local Environment Sensitivity of Collective Plasmon Modes of Gold Nanoresonators to Local Environment

2010-03-12

arxiv.org/abs/1003.2624v1

OPTICS LETTERS, Vol. 35, No. 7, 956-958, 2010.

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages. 2 Figures, 1 Table, accepted to Optics Letters

Scientific paper

We present the first experimental study of optical response of collective plasmon resonances in regular arrays of nanoresonators to local environment. Recently observed collective plasmon modes arise due to diffractive coupling of localised plasmons and yield almost an order of magnitude improvement in resonance quality. We measure the response of these modes to tiny variations of the refractive index of both gaseous and liquid media. We show that the phase sensitivity of the collective resonances can be more than two orders of magnitude better than the best amplitude sensitivity of the same nanodot array as well as an order of magnitude better than the phase sensitivity in SPR sensors.

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