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Nano Lett. 2009 Oct;9(10):3608-11. doi: 10.1021/nl901821s.

Controlling the optical near field of nanoantennas with spatial phase-shaped beams.

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1
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.

Abstract

We report on a novel approach, based on sub-wavelength spatial phase variations at the focus of high-order beams, to reconfigure the optical near field distribution near plasmonic nanostructures. We first show how the introduction of phase jumps in the incident field driving a gap nanoantenna strongly affects its near field response. Beyond, we demonstrate the feasibility of exploiting this approach to selectively switch on and off hot-spots sites within a complex antenna architecture.

PMID:
19639964
DOI:
10.1021/nl901821s
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