Design of a Photonic Crystal Waveguide for Terahertz-Wave Difference-Frequency Generation
Design of a Photonic Crystal Waveguide for Terahertz-Wave Difference-Frequency Generation
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DOI：
10.1109/lpt.2012.2190890
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发表时间：
2012-06
影响因子：
2.6
通讯作者：
Tao Chen;Junqiang Sun;Linsen Li;Jianguan Tang;Yujie Zhou
中科院分区：
文献类型：
--
作者：
Tao Chen;Junqiang Sun;Linsen Li;Jianguan Tang;Yujie Zhou
提出并模拟了一种基于混合通道光波导和光子晶体光波导(PCW)的近红外光源THz波差频产生装置。这种结构通过钛扩散的LiNbO_3沟道波导来引导两个泵浦，并用LiNbO_3光子晶体紧紧地限制了DFG的THz波。通过合理地使用光子晶体波，可以获得连续的相位匹配和很强的泵浦和太赫兹效应重叠。通过数值模拟，分别用连续泵浦和脉冲泵浦源获得了较高的1-THzDFG转换效率。由于光子晶体结构已经被广泛地应用于太赫兹，这种方法有可能为太赫兹技术打开一扇新的窗口。
We propose and simulate a device based on hybrid channel waveguide and photonic crystal waveguide (PCW) for THz-wave difference-frequency generation (DFG) from near-infrared light sources. The proposed structure guides the two pumps by a Ti-diffused LiNbO3 channel waveguide, and confines the DFG THz wave tightly with LiNbO3 PCW. By proper use of the PCW, both continuous phase matching and very strong overlap of the pump and THz product can be obtained. With CW pumps and pulse pumps, the high conversion efficiencies for 1-THz DFG are obtained, respectively, by numerical simulations. Since the photonic crystal structures have been widely exploited for THz applications, this approach has the potential to open a new window for THz technology.