Terahertz-wave generation and detection via surface phonons and plasmons in Reststrahlen bands

研究了通过表面声子模式产生和探测太赫兹波的新方法，以探索太赫兹-声子频率下的Reststrahlen频带。通过数值分析，我们发现了非线性光学晶体中表面声子的新的色散关系以及辐射太赫兹场的分布。基于所分析的结构，利用反应离子刻蚀技术在LiNbO4晶体上成功地制作了高质量的表面光栅。利用太赫兹与光波的非线性混频，在常温下实现了超宽带、高灵敏度的太赫兹波探测。

Novel terahertz-wave generation and detection via surface phonon modes were studied, in order to explore Reststrahlen bands at terahertz-phonon frequencies. Using numerical analysis, we found novel dispersion relations of surface phonons in a nonlinear optical crystal as well as radiative terahertz field patterns. Based on the analyzed structures, high-quality surface gratings were successfully fabricated on lithium niobate crystals, using reactive ion etching. Ultra-broad, sensitive terahertz-wave detection was also realized under ambient temperature, using nonlinear frequency mixing of terahertz and optical waves.