Issue 4, 2019

Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams

Abstract

We investigate second- and third-harmonic generation from individual AlGaAs nanoantennas using far-field mapping with radially- and azimuthally-polarized cylindrical vector beams. Due to the unique polarization structure of these beams, we are able to determine the crystal orientation of the nanoantenna in a single scanning map. Our method thus provides a novel and versatile optical tool to study the crystal properties of semiconductor nanoantennas. We also demonstrate the influence of cylindrical vector beam excitation on the resonant enhancement of second- and third-harmonic generation driven by electric and magnetic anapole-like modes, despite falling in the strong absorption regime of AlGaAs. In particular, we observe a greater nonlinear conversion efficiency from a single nanoantenna excited with a radially-polarized beam as compared to an azimuthally polarized cylindrical vector beam. The fundamental field of the radially-polarized beam strongly couples to the multipoles increasing the near-field enhancement of the nanoantenna. Our work introduces new ways to study individual nanostructures and to tailor the efficiencies of nonlinear phenomena at the nanoscale using non-conventional optical techniques.

Graphical abstract: Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams

Supplementary files

Article information

Article type
Paper
Submitted
03 Oct 2018
Accepted
13 Dec 2018
First published
13 Dec 2018

Nanoscale, 2019,11, 1745-1753

Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams

R. Camacho-Morales, G. Bautista, X. Zang, L. Xu, L. Turquet, A. Miroshnichenko, H. H. Tan, A. Lamprianidis, M. Rahmani, C. Jagadish, D. N. Neshev and M. Kauranen, Nanoscale, 2019, 11, 1745 DOI: 10.1039/C8NR08034H

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