Phase-matched wavelength conversion is achieved in difference frequency generation (DFG) in a structure of gallium arsenide (GaAs) with periodic arrays of nanoholes. Linear properties (refractive indices) of the structure are determined from the S-parameters of the structure. Finite difference time domain (FDTD) simulation is used to calculate the S-parameters. The longest wavelength achieved is 16.2229 μm and the shortest is 3.2961 μm. The results of the FDTD simulation are compared with results obtained from the effective medium theory by using the Maxwell Garnett model. The comparison shows excellent agreement.

中文翻译：

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使用具有纳米孔的纳米结构砷化镓超材料产生相位匹配的中红外差频

在具有周期性纳米孔阵列的砷化镓 (GaAs) 结构中，通过差频生成 (DFG) 实现相位匹配波长转换。结构的线性特性（折射率）由结构的 S 参数确定。有限差分时域 (FDTD) 仿真用于计算 S 参数。实现的最长波长为 16.2229 μm，最短波长为 3.2961 μm。FDTD 模拟的结果与使用 Maxwell Garnett 模型从有效介质理论获得的结果进行了比较。比较显示出极好的一致性。