All semiconductor enhanced high-harmonic generation from a single nanostructured cone
All semiconductor enhanced high-harmonic generation from a single nanostructured cone
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DOI：
10.1038/s41598-019-41642-y
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发表时间：
2019-04-05
影响因子：
4.6
通讯作者：
Merdji, Hamed
中科院分区：
文献类型：
--
作者：
Franz, Dominik;Kaassamani, Shatha;Merdji, Hamed
在纳米尺度上增强和控制非线性现象在科学和工业中具有广泛的应用。在这些现象中，固体中的高次谐波产生是最近的研究焦点，以实现下一代拍赫兹光电子器件或紧凑的全固态EUV源。在这里，我们报告的第一个纳米级高谐波源的实现。强场区是通过将来自几纳焦耳飞秒激光的电场限制在单个3D半导体波导中来实现的。我们揭示了激子过程有利于增强相干谐波和非相干荧光之间的强烈竞争。然而，远离带边缘，谐波发射的明显增强被报道具有稳健的可持续性，为应用提供紧凑的纳米源。我们说明了我们的谐波纳米器件的潜力进行相干衍射成像实验。超紧凑的UV/X射线纳米探针预计具有其他应用，例如Petahertz电子学，纳米断层扫描或纳米医学。
The enhancement and control of non-linear phenomena at a nanometer scale has a wide range of applications in science and in industry. Among these phenomena, high-harmonic generation in solids is a recent focus of research to realize next generation petahertz optoelectronic devices or compact all solid state EUV sources. Here, we report on the realization of the first nanoscale high harmonic source. The strong field regime is reached by confining the electric field from a few nanojoules femtosecond laser in a single 3D semiconductor waveguide. We reveal a strong competition between enhancement of coherent harmonics and incoherent fluorescence favored by excitonic processes. However, far from the band edge, clear enhancement of the harmonic emission is reported with a robust sustainability offering a compact nanosource for applications. We illustrate the potential of our harmonic nano-device by performing a coherent diffractive imaging experiment. Ultra-compact UV/X-ray nanoprobes are foreseen to have other applications such as petahertz electronics, nano-tomography or nano-medicine.