Journal
NANO LETTERS
Volume 11, Issue 12, Pages 5519-5523Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2033602
Keywords
Second harmonic generation; plasmon enhancement; asymmetric nanostructure; three-dimensional; directional scattering
Categories
Funding
- DoD National Security Science and Engineering Faculty [N00244-09-1-0067]
- Air Force Office of Scientific Research [F49620-03-C-0068]
- Office of Naval Research [N00014-10-1-0989]
- Robert A. Welch Foundation [C1220]
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Plasmonic nanostructures enable the generation of large electromagnetic fields confined to small volumes, potentially providing a route for the development of nanoengineered nonlinear optical media. A metal-capped hemispherical nanoparticle, also known as a nanocup, generates second harmonic light with increasing intensity as the angle between the incident fundamental beam and the nanocup symmetry axis is increased. Nanoparticle orientation also modifies the emission direction of the second harmonic light. With conversion efficiencies similar to those of inorganic SHG crystals, these structures provide a promising approach for the design and fabrication of stable, synthetic second-order nonlinear optical materials tailored for specific wavelengths.
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