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Over 100-THz bandwidth selective difference frequency generation at LaAlO3/SrTiO3 nanojunctions

机译:在LaAlO3 / SrTiO3纳米结上产生超过100THz带宽的选择性差频

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摘要

The ability to combine continuously tunable narrow-band terahertz (THz) generation that can access both the far-infrared and mid-infrared regimes with nanometer-scale spatial resolution is highly promising for identifying underlying light-matter interactions and realizing selective control of rotational or vibrational resonances in nanoparticles or molecules. Here, we report selective difference frequency generation with over 100 THz bandwidth via femtosecond optical pulse shaping. The THz emission is generated at nanoscale junctions at the interface of LaAlO3/SrTiO3 (LAO/STO) that is defined by conductive atomic force microscope lithography, with the potential to perform THz spectroscopy on individual nanoparticles or molecules. Numerical simulation of the time-domain signal facilitates the identification of components that contribute to the THz generation. This ultra-wide-bandwidth tunable nanoscale coherent THz source transforms the LAO/STO interface into a promising platform for integrated lab-on-chip optoelectronic devices with various functionalities.
机译:结合连续可调谐的窄带太赫兹(THz)生成能力(可以访问纳米级空间分辨率的远红外和中红外范围)的能力,对于识别潜在的光-物质相互作用并实现对旋转或旋转的选择性控制非常有希望。纳米粒子或分子中的振动共振。在这里,我们报告通过飞秒光脉冲整形产生具有超过100 THz带宽的选择性差分频率。在由导电原子力显微镜光刻定义的LaAlO3 / SrTiO3(LAO / STO)界面处的纳米级结处产生THz发射,并具有对单个纳米粒子或分子进行THz光谱的潜力。时域信号的数值模拟有助于识别有助于THz产生的分量。这种超宽带可调谐纳米级相干THz信号源将LAO / STO接口转换为具有各种功能的集成片上实验室光电设备的有前途的平台。

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