Numerical investigation of highly efficient and tunable terahertz-wave generation using a low-group-velocity and low-dispersion two-dimensional GaAs photonic crystal waveguide
Numerical investigation of highly efficient and tunable terahertz-wave generation using a low-group-velocity and low-dispersion two-dimensional GaAs photonic crystal waveguide
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DOI：
10.35848/1347-4065/abaa93
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发表时间：
2020-09-01
影响因子：
1.5
通讯作者：
Sugimoto, Yoshimasa
中科院分区：
文献类型：
--
作者：
Nakahama, Teruyuki;Ozaki, Nobuhiko;Sugimoto, Yoshimasa
提出了一种利用GaAs基二维光子晶体波导（PhC-WG）实现太赫兹（THz）波差频产生的方法，并进行了数值模拟研究。设计了一种低群速、低色散模式的PhC-WG（LVLD PhC-WG），获得了频率范围从亚太赫兹到数太赫兹的太赫兹-差频。电场增强和相位匹配的两个基本的光脉冲之间的LVLD PhC-WG产生太赫兹DFG约280倍，在GaAs条形波导。该方法适用于基于半导体材料的高效且可调谐的小尺寸太赫兹发射器件。
Efficient terahertz (THz)-wave generation via difference frequency generation (DFG) in a GaAs-based two-dimensional photonic crystal waveguide (PhC-WG) was proposed and investigated through numerical simulations. A PhC-WG with a low-group-velocity and low-dispersion mode (LVLD PhC-WG) was designed, and THz-DFG spanning sub- to several THz in frequency was obtained. Electric field enhancement and phase-matching between two fundamental light pulses in the LVLD PhC-WG generated THz-DFG approximately 280 times that in a GaAs strip waveguide. This method is applicable to highly efficient and tunable small-footprint THz-emitting devices based on semiconductor materials.