期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-24450-9
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资金
- Office of Naval Research [N00014-21-1-2056]
- Cornell Center for Materials Research under the NSF MRSEC program [DMR-1719875]
- Air Force Office of Scientific Research grant [FA9550-16-1-0069]
- AFOSR multidisciplinary research program of the university Research initiative (MURI) [FA9550-16-1-0013]
- UES [GRT00052880]
- A*STAR Quantum Technology for Engineering (QTE) program (Singapore) [A1685b0005]
- A*STAR SERC Pharos program (Singapore) [1527300025]
The researchers demonstrated highly efficient high harmonic generation on a nanoscale platform using a resonant gallium phosphide metasurface, which covers a wide range of photon energies while minimizing reabsorption and material damage. This study facilitates the exploration of the controllable transition between perturbative and non-perturbative regimes of light-matter interactions at the nanoscale.
High harmonic generation (HHG) opens a window on the fundamental science of strong-field light-mater interaction and serves as a key building block for attosecond optics and metrology. Resonantly enhanced HHG from hot spots in nanostructures is an attractive route to overcoming the well-known limitations of gases and bulk solids. Here, we demonstrate a nanoscale platform for highly efficient HHG driven by intense mid-infrared laser pulses: an ultra-thin resonant gallium phosphide (GaP) metasurface. The wide bandgap and the lack of inversion symmetry of the GaP crystal enable the generation of even and odd harmonics covering a wide range of photon energies between 1.3 and 3 eV with minimal reabsorption. The resonantly enhanced conversion efficiency facilitates single-shot measurements that avoid material damage and pave the way to study the controllable transition between perturbative and non-perturbative regimes of light-matter interactions at the nanoscale. Strong nonlinearities, like high harmonic generation in optical systems, can lead to interesting applications in photonics. Here the authors fabricate a thin resonant gallium phosphide metasurface capable of avoiding the laser-induced damage and demonstrate efficient even and odd high harmonic generation from it when driven by mid-infrared laser pulses.
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