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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Femtosecond pump-probe second-harmonic generation from silicon nanogratings.
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APS -APS March Meeting 2017 - Event - Femtosecond pump-probe second-harmonic generation from silicon nanogratings.

机译：APS -APS 2017年3月会议-活动-硅纳米光栅产生飞秒泵浦探针的二次谐波。

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Silicon nanogratings with fin-like nanogroove arrays have been used in nanoelectronics to build field effect transistors (FinFETs), which have attracted enormous attention due to their superior electronic properties. They can also be used in photonic systems to achieve desired linear and nonlinear optical functionalities. Here we perform second-harmonic generation (SHG) measurements using femtosecond laser pulses on a set of 28, 42, and 65 nm-pitch Si nanogratings to study rotational anisotropy and ultrafast dynamics of SHG. We observe that in pump-probe SHG experiments, the SHG signal from a Si nanograting can be instantaneously enhanced 32{%} by an autocorrelated pump pulse. The enhancement is caused by pump-induced transient polarization of photoexcited charge in the nanogratings. We also find that charge photoinjection magnifies the quadrupole SHG component significantly more than the dipole SHG component. These results provide insight into the SHG response at the nanoscale, dynamic behaviors of SHG upon photoexcitation, and ultrafast dynamics of photoexcited carriers in Si nanogratings. Furthermore, SHG results from nanogratings of different pitches provide guidance for using the SHG technique to characterize feature dimensions in Si nanogratings.
机译：具有鳍状纳米槽阵列的硅纳米光栅已用于纳米电子领域，以构建场效应晶体管（FinFET），由于其卓越的电子性能而受到了极大的关注。它们还可用于光子系统中，以实现所需的线性和非线性光学功能。在这里，我们使用飞秒激光脉冲在一组28、42和65 nm间距的Si纳米光栅上执行第二谐波产生（SHG）测量，以研究SHG的旋转各向异性和超快动力学。我们观察到在泵浦探针SHG实验中，来自Si纳米光栅的SHG信号可以通过自相关泵浦脉冲瞬时增强32 {％}。增强是由泵浦诱导的纳米光栅中的光激发电荷的瞬态极化引起的。我们还发现，电荷光注入对四极SHG分量的放大作用明显大于偶极SHG分量。这些结果提供了对纳米级SHG响应，光激发后SHG的动态行为以及Si纳米光栅中光激发载流子的超快动力学的深入了解。此外，由不同间距的纳米光栅得到的SHG为使用SHG技术表征Si纳米光栅中的特征尺寸提供了指导。

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