Enhanced high-harmonic generation from an all-dielectric metasurface
Enhanced high-harmonic generation from an all-dielectric metasurface
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DOI：
10.1038/s41567-018-0233-6
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发表时间：
2018-10-01
期刊：
影响因子：
19.6
通讯作者：
Reis, David A.
中科院分区：
文献类型：
--
作者：
Liu, Hanzhe;Guo, Cheng;Reis, David A.
最近观察到的高次谐波产生固体工程基本强场过程中创建了一个新的可能性，通过图案化的固体目标与亚波长纳米结构。全介电超表面具有高损伤阈值和驱动场的强增强，使其成为控制纳米级高次谐波和其他高场过程的有吸引力的平台。在这里，我们报告增强的非微扰高谐波发射从Fano共振Si超颖表面，具有电磁感应透明的经典模拟。与未图案化的样品相比，谐波发射增强了两个以上的数量级。增强的高次谐波相对于激发偏振是高度各向异性的，并且由于其共振特征而通过激发波长进行选择。通过将纳米纤维技术和超快强场物理学相结合，我们的工作为设计在高强度和短波长下工作的新型紧凑型超快光子器件铺平了道路。
The recent observation of high-harmonic generation from solids creates a new possibility for engineering fundamental strong-field processes by patterning the solid target with subwavelength nanostructures. All-dielectric metasurfaces exhibit high damage thresholds and strong enhancement of the driving field, making them attractive platforms to control high harmonics and other high-field processes at the nanoscale. Here we report enhanced non-perturbative high harmonic emission from a Fano-resonant Si metasurface that possesses a classical analogue of electromagnetically induced transparency. The harmonic emission is enhanced by more than two orders of magnitude compared to unpatterned samples. The enhanced high harmonics are highly anisotropic with respect to the excitation polarization and are selective by the excitation wavelength due to its resonant features. By combining nanofabrication technology and ultrafast strong-field physics, our work paves the way for the design of new compact ultrafast photonic devices that operate under high intensities and at short wavelengths.