AI Article Synopsis
- * The study showcases the use of gold nano-antennas in a wide-bandgap semiconductor, ZnO, to effectively trigger HHG with lower input intensity and achieve high harmonic orders.
- * Enhanced conversion efficiency due to nano-antennas leads to a significant increase in total yield, and the results may allow for the development of compact EUV sources and improved understanding of material band structures.
Article Abstract
High harmonic generation (HHG) in solids has great potential for coherent extreme ultraviolet (EUV) sources, all-optical band-structure reconstruction, and electron dynamics metrology. Solid HHG driven by plasmonic near-fields will open a new paradigm, enabling high repetition-rate HHG with a compact laser, HHG manipulation with meta-surfaces, and precise control over carrier trajectory. In this paper, we demonstrate antenna-enhanced HHG in a wide-bandgap semiconductor ZnO. By exploiting gold nano-antennas resonating at the driver wavelength of 2 μm, we successfully trigger HHG at input intensity of ~0.02 TW/cm and observe harmonic radiations up to 9th-order. Orders-of-magnitude enhanced conversion efficiency at the hot-spots brings about ten-fold enhancement in the total yield. The spectral selection rule is found to reflect crystal symmetry, suggesting the possibility of nano-scaled EUV sources and band-structure reconstruction.
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| http://dx.doi.org/10.1364/OE.26.021364 | DOI Listing |
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