Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams
| Autor: | Dragomir N. Neshev, Lei Xu, Chennupati Jagadish, Godofredo Bautista, Andrey E. Miroshnichenko, Martti Kauranen, Léo Turquet, Rocio Camacho-Morales, Aristeidis Lamprianidis, Xiaorun Zang, Mohsen Rahmani, Hark Hoe Tan |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Nanostructure business.industry Energy conversion efficiency Physics::Optics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences 0104 chemical sciences Optics Semiconductor Excited state High harmonic generation General Materials Science 0210 nano-technology business Excitation Beam (structure) |
| Zdroj: | Nanoscale. 11:1745-1753 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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