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Issue 4, 2019
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Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams

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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

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Publication details

The article was received on 03 Oct 2018, accepted on 13 Dec 2018 and first published on 13 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR08034H
Citation: Nanoscale, 2019,11, 1745-1753

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    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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