Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams

被引：27

作者：

Camacho-Morales, Rocio ^{[1
]}

Bautista, Godofredo ^{[2
]}

Zang, Xiaorun ^{[2
]}

Xu, Lei ^{[3
]}

Turquet, Leo ^{[2
]}

Miroshnichenko, Andrey ^{[3
]}

Tan, Hark Hoe ^{[4
]}

Lamprianidis, Aristeidis ^{[1
]}

Rahmani, Mohsen ^{[1
]}

Jagadish, Chennupati ^{[4
]}

Neshev, Dragomir N. ^{[1
]}

Kauranen, Martti ^{[2
]}

机构：

[1] Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia

[2] Tampere Univ, Lab Photon, POB 692, FI-33101 Tampere, Finland

[3] Univ New South Wales, Sch Engn & Informat Technol, Canberra, ACT 2600, Australia

[4] Australian Natl Univ, Dept Elect Mat Engn, Res Sch Phys & Engn, Canberra, ACT 2601, Australia

来源：

NANOSCALE | 2019年 / 11卷 / 04期

基金：

澳大利亚研究理事会; 芬兰科学院;

关键词：

ENHANCED 2ND-HARMONIC GENERATION; FANO RESONANCES; SINGLE; SCATTERING; NANOWIRES;

D O I：

10.1039/c8nr08034h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：1745 / 1753

页数：9

共 52 条

[1] Magnetic fano resonances in all-dielectric nanocomplexes under cylindrical vector beams excitation [J].