Enhancement of Terahertz Pulse Emission by Optical Nanoantenna
Enhancement of Terahertz Pulse Emission by Optical Nanoantenna
复制标题
DOI：
10.1021/nn204542x
复制
发表时间：
2012-03-01
期刊：
影响因子：
17.1
通讯作者：
Jeong, Ki-Hun
中科院分区：
文献类型：
--
作者：
Park, Sang-Gil;Jin, Kyong Hwan;Jeong, Ki-Hun
太赫兹光电导天线（PCA）作为超短脉冲光波和太赫兹（THz）波之间的差距，是通过各种光学和电学方法发射或探测THz波的主要组成部分。然而，THz PCA仍然缺乏用于高功率THz发射的先进突破性技术。在这里，我们报告的太赫兹发射功率的增强，通过将光学纳米天线与太赫兹光电导天线。利用高折射率光导衬底上的光学纳米天线可以有效地实现光导衬底上的光学泵浦束的限制和集中。数值计算和实验结果都清楚地表明，由于纳米天线的等离子体共振产生的高光生载流子，太赫兹波发射增强。这项工作为在THz和光学频率下在单个PCA上集成各种光子元件开辟了许多机会。
Bridging the gap between ultrashort pulsed optical waves and terahertz (THz) waves, the THz photoconductive antenna (PCA) is a major constituent for the emission or detection of THz waves by diverse optical and electrical methods. However, THz PCA still lacks employment of advanced breakthrough technologies for high-power THz emission. Here, we report the enhancement of THz emission power by Incorporating optical nanoantennas with a THz photoconductive antenna. The confinement and concentration of an optical pump beam on a photoconductive substrate can be efficiently achieved with optical nanoantennas over a high-index photoconductive substrate. Both numerical and experimental results clearly demonstrate the enhancement of THz wave emission due to high photocarrier generation at the plasmon resonance of nanoantennas. This work opens up many opportunities for diverse integrated photonic elements on a single PCA at THz and optical frequencies.