Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
Nano Lett. 2013 Jun 12;13(6):2884-8. doi: 10.1021/nl401219v. Epub 2013 May 23.
Terahertz (0.1-30 THz) radiation reveals a wealth of information that is relevant for material, biological, and medical sciences with applications that span chemical sensing, high-speed electronics, and coherent control of semiconductor quantum bits. To date, there have been no methods capable of controlling terahertz (THz) radiation at molecular scales. Here we report both generation and detection of broadband terahertz field from 10 nm scale oxide nanojunctions. Frequency components of ultrafast optical radiation are mixed at these nanojunctions, producing broadband THz emission. These same devices detect THz electric fields with comparable spatial resolution. This unprecedented control, on a scale of 4 orders of magnitude smaller than the diffraction limit, creates a pathway toward THz-bandwidth spectroscopy and control of individual nanoparticles and molecules.
太赫兹（0.1-30 太赫兹）辐射揭示了大量与材料、生物和医学科学相关的信息，其应用涵盖化学传感、高速电子学以及半导体量子位的相干控制。迄今为止，还没有能够在分子尺度上控制太赫兹（THz）辐射的方法。在这里，我们报告了从 10nm 尺度的氧化物纳结产生和探测宽带太赫兹场。超快光辐射的频率分量在这些纳结处混合，产生宽带太赫兹发射。这些相同的器件以相当的空间分辨率探测太赫兹电场。这种在比衍射极限小 4 个数量级的尺度上的前所未有的控制，为太赫兹带宽光谱学以及对单个纳米粒子和分子的控制开辟了道路。
