Journal
NANO LETTERS
Volume 16, Issue 5, Pages 3373-3378Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01095
Keywords
Plasmons; nonlinear optics; nanoparticles; difference-frequency generation
Categories
Funding
- Welch Foundation [C-1220, C-1222]
- Air Force Office of Scientific Research [FA 9550-15-1-0022]
- Department of Physics and Astronomy
- College of Arts and Sciences of the University of New Mexico
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Active optical processes such as amplification and stimulated emission promise to play just as important a role in nanoscale optics as they have in mainstream modern optics. The ability of metallic nanostructures to enhance optical nonlinearities at the nanoscale has been shown for a number of nonlinear and active processes; however, one important process yet to be seen is optical parametric amplification. Here, we report the demonstration of surface plasmon-enhanced difference frequency generation by integration of a nonlinear optical medium, BaTiO3, in nanocrystalline form within a plasmonic nanocavity. These nanoengineered composite structures support resonances at pump, signal, and idler frequencies, providing large enhancements of the confined fields and efficient coupling of the wavelength converted idler radiation to the far-field. This nanocomplex works as a nanoscale tunable infrared light source and paves the way for the design and fabrication of a surface plasmon-enhanced optical parametric amplifier.
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