Highly sensitive electro-optic sampling of terahertz waves using field enhancement in a tapered waveguide structure
Highly sensitive electro-optic sampling of terahertz waves using field enhancement in a tapered waveguide structure
复制标题
DOI：
10.7567/apex.7.112401
复制
发表时间：
2014-10
影响因子：
2.3
通讯作者：
S. Tsuzuki;D. Takeshima;T. Sakon;T. Kinoshita;T. Nagase;K. Kurihara;Kohji Yamamoto;F. Kuwashima;T. Furuya;E. Estacio;K. Kawase;M. Bakunov;M. Tani
中科院分区：
文献类型：
--
作者：
S. Tsuzuki;D. Takeshima;T. Sakon;T. Kinoshita;T. Nagase;K. Kurihara;Kohji Yamamoto;F. Kuwashima;T. Furuya;E. Estacio;K. Kawase;M. Bakunov;M. Tani
本文报道了利用锥形金属波导中的太赫兹场增强效应来提高太赫兹脉冲的电光采样探测灵敏度。一个薄的硅棱镜，放置在波导的较窄的部分，是用来同步的增强太赫兹场与探测激光脉冲传播的铌酸锂晶体连接到波导的斜切端。LiNbO3表面上40 μ m厚的MgO掺杂层用于引导探测脉冲。所开发的结构表现出20倍以上的检测灵敏度比无波导，硅棱镜耦合铌酸锂晶体。
We report on increasing the sensitivity of electro-optic sampling detection of terahertz pulses by using the effect of terahertz field enhancement in a tapered metallic waveguide. A thin Si prism, placed in the narrower section of the waveguide, is used to synchronize the enhanced terahertz field with the probe laser pulse propagating in a LiNbO3 crystal attached to the obliquely cut end of the waveguide. A 40-µm-thick MgO-doped layer on the surface of LiNbO3 is used for guiding the probe pulse. The developed structure demonstrates a 20-fold higher detection sensitivity than a no-waveguide, Si-prism-coupled LiNbO3 crystal.