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首页> 外文期刊>Optics and Photonics Journal >THz-Wave Generation from GaP THz Photonic Crystal Waveguides under Difference-Frequency Mixing
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THz-Wave Generation from GaP THz Photonic Crystal Waveguides under Difference-Frequency Mixing

机译：差频混频下GaP THz光子晶体波导的太赫兹波产生

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摘要

GaP terahertz (THz) two-dimensional (2D) photonic crystal (PC) waveguides with line defects were fabricated using inductively-coupled plasma reactive-ion etching (ICP-RIE) in Ar/Cl2 gas chemistries. THz-wave generation from the fabricated PC waveguides was demonstrated under collinear phase-matched difference-frequency generation (DFG), using Cr:Forsterite (Cr:F) lasers as the incident source. We compared the THz-wave output characteristics of the PC waveguides with that of GaP planar waveguides. The collinear phase-matching conditions in the DFG process were satisfied for 300- and 500-μm-wide PC waveguide structures at 0.7 and 0.6 THz, respectively. The additional output peaks that appeared near the edge of the photonic band gap, around 0.5 THz, were attributed to the guiding modes in the PC waveguide; no such peaks appeared in the non-patterned ridge waveguides. These experimental results suggest that the phonon-polariton confinement in THz-PC waveguides based on the GaP crystal could be used to enhance the nonlinear optical effect for THz-wave generation.
机译：在Ar / Cl2气体化学反应中，使用感应耦合等离子体反应离子刻蚀（ICP-RIE）制造了具有线缺陷的GaP太赫兹（THz）二维（2D）光子晶体（PC）波导。在共线相位匹配差频产生（DFG）下，使用Cr：镁橄榄石（Cr：F）激光器作为入射源，证明了从制成的PC波导产生的THz波。我们比较了PC波导和GaP平面波导的THz波输出特性。对于分别在0.7和0.6 THz处的300和500μm宽的PC波导结构，分别满足了DFG工艺中的共线相位匹配条件。出现在光子带隙边缘附近的其他输出峰值（大约0.5 THz）归因于PC波导中的引导模式。在没有图案的脊形波导中没有出现这样的峰值。这些实验结果表明，基于GaP晶体的THz-PC波导中的声子-极化子限制可以用来增强THz波产生的非线性光学效应。

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