Nonlinear Generation of Vector Beams From AlGaAs Nanoantennas

Year: 2016

Authors: Camacho-Morales R., Rahmani M., Kruk S., Wang L., Xu L., Smirnova D. A., Solntsev A. S., Miroshnichenko A., Hoe Tan H., Karouta F., Naureen S., Vora K., Carletti L., De Angelis C., Jagadish C., Kivshar Y. S., Neshev D. N.

Autors Affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering and Department of Electronic Materials Engineering,
Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia;
The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai
University, Tianjin 300457, China; Department of Information Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy

Abstract: 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 vector polarization beams, including beams with radial polarization.

Journal/Review: NANO LETTERS

Volume: 16 (11)      Pages from: 7191  to: 7197

KeyWords: nonlinear optics; nano photonics;
DOI: 10.1021/acs.nanolett.6b03525

Citations: 224
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