论文标题
向后匹配的第二次谐波一代来自堆叠的跨额叶
Backward phase-matched second-harmonic generation from stacked metasurfaces
论文作者
论文摘要
我们展示了来自由堆叠式跨面的三维超材料的相匹配的第二谐波生成（SHG）。为了实现相匹配，我们利用一种基于相互作用波长元时间工程的相位工程的新机制，从而促进了在非常规的向后方向上的相匹配的SHG。通过堆叠多达五个metasurfaces，我们获得了SHG效率增强25的预期因子。我们的结果激发了进一步的研究，以实现更复杂的波前也达到更高的转化效率。
We demonstrate phase-matched second-harmonic generation (SHG) from three-dimensional metamaterials consisting of stacked metasurfaces. To achieve phase matching, we utilize a novel mechanism based on phase engineering of the metasurfaces at the interacting wavelengths, facilitating phase-matched SHG in the unconventional backward direction. By stacking up to five metasurfaces, we obtain the expected factor of 25 enhancement in SHG efficiency. Our results motivate further investigations to achieve higher conversion efficiencies also with more complex wavefronts.
