Role of antenna modes and field enhancement in second harmonic generation from dipole nanoantennas

Year: 2015

Authors: de Ceglia D., Vincenti M. A., De Angelis C., Locatelli A., Haus J. W., Scalora M.

Autors Affiliation: National Research Council – AMRDEC, Charles M. Bowden Research Center, Redstone Arsenal, AL 35898, USA;
Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia, Brescia 25123, Italy;
Electro-Optics Program, University of Dayton, Dayton, OH 45469-2951, USA;
Charles M. Bowden Research Center, AMRDEC, RDECOM, Redstone Arsenal, AL 35898-5000, USA

Abstract: We study optical second harmonic generation from metallic dipole antennas with narrow gaps. Enhancement of the fundamentalfrequency field in the gap region plays a marginal role on conversion efficiency. In the symmetric configuration, i.e., with the gap located at the center of the antenna axis, reducing gap size induces a significant red-shift of the maximum conversion efficiency peak. Either enhancement or inhibition of second-harmonic emission may be observed as gap size is decreased, depending on the antenna mode excited at the harmonic frequency. The second-harmonic signal is extremely sensitive to the asymmetry introduced by gap

Journal/Review: OPTICS EXPRESS

Volume: 23 (2)      Pages from: 1715  to: 1729

More Information: This research was performed while M. A. Vincenti and D. de Ceglia held a National Research Council Research Associateship award at the U.S. Army AMRDEC. C. De Angelis and A. Locatelli acknowledge financial support from US Army (contract W911NF-13-1-0466, \”Engineering second order nonlinear effects in optical antennas\”) and CARIPLO (contract 2013-0736, \”SHAPES-Second-HArmonicPlasmon-Enhanced Sensing\”).
DOI: 10.1364/OE.23.001715

Citations: 37
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