期刊
OPTICS EXPRESS
卷 23, 期 2, 页码 1715-1729出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.001715
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资金
- National Research Council Research Associateship award at the U.S. Army AMRDEC
- US Army [W911NF-13-1-0466]
- CARIPLO [2013-0736]
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'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. (C) 2015 Optical Society of America
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