Journal
NANO LETTERS
Volume 16, Issue 11, Pages 7191-7197Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03525
Keywords
Nonlinear optics; second harmonic generation; dielectric nanoantennas; nanophotonics; III-V semiconductors; nanofabrication
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Funding
- Australian Research Council
- Erasmus Mundus NANOPHI project [2013 5659/002-001]
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The quest for nanoscale light sources with designer radiation patterns and polarization has motivated the development of nanoantennas that interact strongly with the incoming light and are able to transform its frequency, radiation, and polarization patterns. Here, we demonstrate dielectric AlGaAs nanoantennas for efficient second harmonic generation, enabling the control of both directionality and polarization of nonlinear emission. This is enabled by specialized III-V semiconductor nanofabrication of high-quality AlGaAs nanostructures embedded in optically transparent low-index material, thus allowing for simultaneous forward and backward nonlinear emission. We show that the nanodisk AlGaAs antennas can emit second harmonic in preferential direction with a backward-to-forward ratio of up to five and can also generate complex beams with radial polarization.
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