Proposal for Efficient Terahertz-Wave Difference Frequency Generation in an AlGaAs Photonic Crystal Waveguide
Proposal for Efficient Terahertz-Wave Difference Frequency Generation in an AlGaAs Photonic Crystal Waveguide
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DOI：
10.1109/jlt.2012.2192908
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发表时间：
2012-07
影响因子：
4.7
通讯作者：
Tao Chen;Junqiang Sun;Linsen Li;Jianguan Tang
中科院分区：
文献类型：
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作者：
Tao Chen;Junqiang Sun;Linsen Li;Jianguan Tang
设计了一种AlGaAs基太赫兹光子晶体波导，用于近红外光源产生太赫兹差频。PCW结构提供了太赫兹波场的紧密限制，导致三个波的良好模式场重叠。通过选择合适的波导参数和抽运波长，可以满足两个抽运光与太赫兹布洛赫波之间唯一的相位匹配条件。利用模式理论导出的描述光传输的耦合模方程，模拟了连续太赫兹差频产生过程，得到了3 THz的高功率归一化转换效率为0.7632 × 10-4 W-1.
We design an AlGaAs-based terahertz photonic crystal waveguide (PCW) to achieve terahertz-wave difference frequency generation (DFG) from near-infrared light sources. The PCW structure provides a tight confinement of terahertz-wave field, resulting in a good mode field overlap of three waves. The unique phase matching condition between two pump waves and terahertz Bloch wave can be satisfied through choosing appropriate waveguide parameters and pump wavelengths. With the coupled-mode equations derived from modal theory for describing the light propagation, we simulate the continuous terahertz DFG process, and a high power-normalized conversion efficiency of 0.7632 × 10-4 W -1 for 3 THz generation is obtained.