Authors
David P Fromm, Arvind Sundaramurthy, P James Schuck, Gordon Kino, WE Moerner
Publication date
2004/5/12
Journal
Nano letters
Volume
4
Issue
5
Pages
957-961
Publisher
American Chemical Society
Description
Metallic “bowtie” nanoantennas consisting of two opposing tip-to-tip Au triangles have been fabricated with triangle lengths of 75 nm and gaps ranging from 16 to 488 nm. For light polarized along the line between the two triangles, the plasmon scattering resonance first blue-shifts with increasing gap, and then red-shifts as the particles become more and more uncoupled, while perpendicularly polarized excitation shows little dependence upon gap size. This behavior may be approximately understood in a coupled-dipole approximation as changes in the phase between static dipole−dipole interactions and dipole radiative interaction effects.
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