期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms6432
关键词
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资金
- US Army Research Office [W911NF-09-1- 0477, W911NF-11-1-0024]
- National Institutes of Health (NIH) through the NIH Director's New Innovator Award Program [1-DP2-7251-01]
- US Department of Defense, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate Fellowship
- OFFICE OF THE DIRECTOR, NATIONAL INSTITUTES OF HEALTH [DP2OD007251] Funding Source: NIH RePORTER
Coherent and tunable nanoscale light sources utilizing optical nonlinearities are required for applications ranging from imaging and bio-sensing to on-chip all-optical signal processing. However, owing to their small sizes, the efficiency of nanostructures even with high nonlinear coefficients is poor, therefore requiring very high excitation energies. Although surface-plasmon resonances of metal nanostructures can enhance surface nonlinear processes such as second-harmonic generation, they still suffer from low conversion efficiencies owing to their intrinsically low nonlinear coefficients. Here we show highly enhanced and directional second-harmonic generation from individual CdS nanowires integrated with silver nanocavities (>1,000 times higher external efficiency compared with bare CdS), in which the lowest-order whispering gallery mode is engineered to concentrate light in the nonlinear material while minimizing Ohmic losses. The directional nonlinear signal is redirected into another waveguide, which is then utilized to configure an optical router that can potentially serve as a tunable coherent light source to enable on-chip signal processing for integrated nanophotonic systems.
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