Role of Antenna Modes and Field Enhancement in Second Harmonic Generation from Dipole Nanoantennas

Author(s)

Domenico de Ceglia, Charles M. Bowden Research Center
Maria Antonietta Vincenti, Charles M. Bowden Research Center
Costantino De Angelis, Università degli Studi di Brescia
Andrea Locatelli, Università degli Studi di Brescia
Joseph W. Haus, University of DaytonFollow
Michael Scalora, Charles M. Bowden Research Center

Document Type

Article

Publication Date

1-2015

Publication Source

Optics Express

Abstract

We study optical second harmonic generation from metallic dipole antennas with narrow gaps. Enhancement of the fundamental-frequency 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’s displacements with respect to the antenna center. In this situation, second-harmonic light can couple to all the available antenna modes. We perform a multipolar analysis that allows engineering the far-field SH emission and find that the interaction with quasi-odd-symmetry modes generates radiation patterns with a strong dipolar component.

Inclusive pages

1715-1729

ISBN/ISSN

1094-4087

Document Version

Published Version

Comments

The article available for download is an open-access publication, provided in compliance with the publisher's paid open-access policy.

Permission documentation is on file.

Copyright

Copyright © 2015, Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Publisher

Optical Society of America

Volume

23

Issue

2

Peer Reviewed

yes

eCommons Citation

de Ceglia, Domenico; Vincenti, Maria Antonietta; De Angelis, Costantino; Locatelli, Andrea; Haus, Joseph W.; and Scalora, Michael, "Role of Antenna Modes and Field Enhancement in Second Harmonic Generation from Dipole Nanoantennas" (2015). Electro-Optics and Photonics Faculty Publications. 42.
https://ecommons.udayton.edu/eop_fac_pub/42