期刊
ACS PHOTONICS
卷 1, 期 11, 页码 1212-1217出版社
AMER CHEMICAL SOC
DOI: 10.1021/ph500276v
关键词
third-harmonic generation; nonlinear optics; plasmonics; nanoantenna; patch antenna
类别
资金
- Air Force Office of Scientific Research (AFOSR) [FA9550-12-1-0491]
- Army Research Office through a Multidisciplinary University Research Initiative [W911NF-09-1-0539]
- DARPA Young Faculty Award [N66001-11-1-4152]
- Office of Naval Research Young Investigator Program [N00014-11-1-0645]
- Lord Foundation of North Carolina
Because of their ability to strongly localize and enhance optical fields, plasmonic nanostructures have the potential to dramatically amplify the inherent nonlinear response of materials. We illustrate the impact of this plasmonic interaction by investigating the third-harmonic generation (THG) from a system of film-coupled nanostripes operating at 1500 nm. Both the film and the stripes are gold, separated by a nanoscale layer of aluminum oxide (Al2O3) grown using atomic layer deposition. This nanoscale junction, with an ultrasmooth interface, forms a waveguide cavity resonator with a large and controllable electric field enhancement, whose plasmon resonance can be tuned independently by changing the stripe width. We study experimentally the dependence of THG on the field enhancement by varying the gap size between the stripe and the metal film while simultaneously maintaining a fixed plasmon resonance. The experiments are supported with numerical simulations in which nonlinear contributions of the dielectric spacer layer and the metal are considered. Enhancements of the THG of nearly 5 orders of magnitude with respect to a bare metal film are measured experimentally for the smallest gap sizes, with a trend similar to that found in the numerical simulations.
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