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Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams
Rocio Camacho-Morales1, Godofredo Bautista, Xiaorun Zang
1Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia. rocio.camacho@anu.edu.au.
Nanoscale
|January 10, 2019
Summary
We developed a new optical method using polarized light to determine the crystal orientation of aluminum gallium arsenide (AlGaAs) nanoantennas. This technique enhances nonlinear light generation for nanoscale applications.
Area of Science:
- Nanophotonics
- Nonlinear Optics
- Materials Science
Background:
- Semiconductor nanoantennas offer unique optical properties.
- Nonlinear harmonic generation is crucial for optical signal processing and microscopy.
- Characterizing crystal orientation in nanostructures is challenging.
Purpose of the Study:
- To develop a novel optical technique for determining crystal orientation in AlGaAs nanoantennas.
- To investigate the influence of cylindrical vector beams on harmonic generation.
- To enhance nonlinear conversion efficiency in nanoantennas.
Main Methods:
- Far-field mapping of second- and third-harmonic generation.
- Excitation using radially- and azimuthally-polarized cylindrical vector beams.
- Analysis of AlGaAs nanoantennas in the strong absorption regime.
Main Results:
- Successfully determined nanoantenna crystal orientation using polarization-dependent harmonic generation.
- Observed resonant enhancement of harmonic generation via electric and magnetic anapole modes.
- Demonstrated higher nonlinear conversion efficiency with radially-polarized beams due to enhanced near-field coupling.
Conclusions:
- Cylindrical vector beams provide a versatile tool for nanoantenna characterization.
- Tailoring beam polarization can optimize nonlinear phenomena in nanostructures.
- This method opens new avenues for studying individual nanostructures and enhancing nanoscale nonlinear optics.
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