title: Nonlinear Generation of Vector Beams From AlGaAs Nanoantennas.
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.
authors: Rocio
authors: R
authors: Camacho-Morales
authors: Mohsen
authors: M
authors: Rahmani
authors: Sergey
authors: S
authors: Kruk
authors: Lei
authors: L
authors: Wang
authors: The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University , Tianjin 300457, China.
authors: Lei
authors: L
authors: Xu
authors: Daria A
authors: DA
authors: Smirnova
authors: Alexander S
authors: AS
authors: Solntsev
authors: Andrey
authors: A
authors: Miroshnichenko
authors: Hark Hoe
authors: HH
authors: Tan
authors: Fouad
authors: F
authors: Karouta
authors: Shagufta
authors: S
authors: Naureen
authors: Kaushal
authors: K
authors: Vora
authors: Department of Information Engineering, University of Brescia , Via Branze 38, 25123 Brescia, Italy.
authors: Luca
authors: L
authors: Carletti
authors: Department of Information Engineering, University of Brescia , Via Branze 38, 25123 Brescia, Italy.
authors: Costantino
authors: C
authors: De Angelis
authors: Chennupati
authors: C
authors: Jagadish
authors: Yuri S
authors: YS
authors: Kivshar
authors: Dragomir N
authors: DN
authors: Neshev
keywords: III−V semiconductors; Nonlinear optics; dielectric nanoantennas; nanofabrication; nanophotonics; second harmonic generation