Role of Antenna Modes and Field Enhancement in Second Harmonic Generation from Dipole Nanoantennas
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
Copyright
Copyright © 2015, Optical Society of America
Publisher
Optical Society of America
Volume
23
Peer Reviewed
yes
Issue
2
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). Electrical and Computer Engineering Faculty Publications. 271.
https://ecommons.udayton.edu/ece_fac_pub/271
Comments
Permission documentation is on file.