Continuous Wave Second Harmonic Generation Enabled by Quasi-Bound-States in the Continuum on Gallium Phosphide Metasurfaces
| Autor: | Tobias W. W. Maß, Arseniy I. Kuznetsov, Son Tung Ha, Leonid A. Krivitsky, Aravind P. Anthur, Dmitry A. Kalashnikov, Ramón Paniagua-Domínguez, Haizhong Zhang |
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| Rok vydání: | 2020 |
| Předmět: |
Electromagnetic field
Materials science FOS: Physical sciences Physics::Optics Bioengineering 02 engineering and technology Dielectric chemistry.chemical_compound Gallium phosphide General Materials Science business.industry Mechanical Engineering Second-harmonic generation General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Wavelength chemistry Optoelectronics Continuous wave Photonics 0210 nano-technology business Order of magnitude Optics (physics.optics) Physics - Optics |
| Zdroj: | Nano Letters. 20:8745-8751 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.0c03601 |
| Popis: | Resonant metasurfaces are an attractive platform for enhancing the non-linear optical processes, such as second harmonic generation (SHG), since they can generate very large local electromagnetic fields while relaxing the phase-matching requirements. Here, we take this platform a step closer to the practical applications by demonstrating visible range, continuous wave (CW) SHG. We do so by combining the attractive material properties of gallium phosphide with engineered, high quality-factor photonic modes enabled by bound states in the continuum. For the optimum case, we obtain efficiencies around 5e-5 % W$^{-1}$ when the system is pumped at 1200 nm wavelength with CW intensities of 1 kW/cm$^2$. Moreover, we measure external efficiencies as high as 0.1 % W$^{-1}$ with pump intensities of only 10 MW/cm$^2$ for pulsed irradiation. This efficiency is higher than the values previously reported for dielectric metasurfaces, but achieved here with pump intensities that are two orders of magnitude lower. |
| Databáze: | OpenAIRE |
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