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Shaping plasmon beams via the controlled illumination of finite-size plasmonic crystals

Bouillard, J.-S.; Segovia, P.; Dickson, W.; Wurtz, G. A.; Zayats, A. V.

Authors

P. Segovia

W. Dickson

G. A. Wurtz

A. V. Zayats

Abstract

Plasmonic crystals provide many passive and active optical functionalities, including enhanced sensing, optical nonlinearities, light extraction from LEDs and coupling to and from subwavelength waveguides. Here we study, both experimentally and numerically, the coherent control of SPP beam excitation in finite size plasmonic crystals under focussed illumination. The correct combination of the illuminating spot size, its position relative to the plasmonic crystal, wavelength and polarisation enables the efficient shaping and directionality of SPP beam launching. We show that under strongly focussed illumination, the illuminated part of the crystal acts as an antenna, launching surface plasmon waves which are subsequently filtered by the surrounding periodic lattice. Changing the illumination conditions provides rich opportunities to engineer the SPP emission pattern. This offers an alternative technique to actively modulate and control plasmonic signals, either via micro- and nano-electromechanical switches or with electro- and all-optical beam steering which have direct implications for the development of new integrated nanophotonic devices, such as plasmonic couplers and switches and on-chip signal demultiplexing. This approach can be generalised to all kinds of surface waves, either for the coupling and discrimination of light in planar dielectric waveguides or the generation and control of non-diffractive SPP beams.

Journal Article Type Article
Publication Date 2015-05
Journal Scientific reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 4
Issue 1
Article Number UNSP 7234
Institution Citation Bouillard, J., Segovia, P., Dickson, W., Wurtz, G. A., & Zayats, A. V. (2015). Shaping plasmon beams via the controlled illumination of finite-size plasmonic crystals. Scientific reports, 4(1), https://doi.org/10.1038/srep07234
DOI https://doi.org/10.1038/srep07234
Keywords Plasmonic crystals
Publisher URL http://www.nature.com/articles/srep07234
Additional Information Copy of article: Bouillard, J.-S., Segovia, P., Dickson, W., Wurtz, G.A. & Zayats, A.V. Shaping plasmon beams via the controlled illumination of finite-size plasmonic crystals. Sci. Rep. 4, 7234; DOI:10.1038/srep07234 (2014).

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