Chen Lu, Sutton Erin, Lee Hyungwoo, Lee Jung-Woo, Li Jianan, Eom Chang-Beom, Irvin Patrick, Levy Jeremy
1Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 USA.
Pittsburgh Quantum Institute, Pittsburgh, PA 15260 USA.
Light Sci Appl. 2019 Feb 27;8:24. doi: 10.1038/s41377-019-0135-0. eCollection 2019.
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 LaAlO/SrTiO (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.
能够将可连续调谐的窄带太赫兹（THz）产生与纳米级空间分辨率相结合，从而同时进入远红外和中红外波段，这对于识别潜在的光与物质相互作用以及实现对纳米颗粒或分子中旋转或振动共振的选择性控制非常有前景。在此，我们报告了通过飞秒光脉冲整形实现带宽超过100 THz的选择性差频产生。太赫兹发射在由导电原子力显微镜光刻定义的LaAlO/SrTiO（LAO/STO）界面的纳米级结处产生，具有对单个纳米颗粒或分子进行太赫兹光谱分析的潜力。时域信号的数值模拟有助于识别对太赫兹产生有贡献的成分。这种超宽带可调谐纳米级相干太赫兹源将LAO/STO界面转变为一个具有各种功能的集成片上实验室光电器件的有前景的平台。
