Nonlinear photonic crystals
Nonlinear photonic crystals
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DOI：
10.1103/physrevlett.81.4136
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发表时间：
1998-11-09
影响因子：
8.6
通讯作者：
Berger, V
中科院分区：
文献类型：
--
作者：
Berger, V
对二维CHI((2))光子晶体中的非线性频率转换进行了理论研究。这种晶体具有2D周期非线性极化率和线性极化率，线性极化率是频率的函数，但在空间上是恒定的。它是一维准相位匹配结构的平面推广，可以在周期极化的LiNbO4中实现，也可以在GaAs中实现。这些结构的一个有趣的特性是，与一维情况相比，新的相位匹配过程出现在2D平面上。结果表明，这些面内相位匹配共振是由非线性Bragg定律和相关的非线性Ewald结构给出的。展望了多光束二次谐波(SHG)、环形腔二次谐波(SHG)或多波长频率转换的应用前景。
Nonlinear frequency conversion in 2D chi((2)) photonic crystals is theoretically studied. Such a crystal has a 2D periodic nonlinear susceptibility, and a linear susceptibility which is a function of the frequency, but constant in space. It is an in-plane generalization of 1D quasi-phase-matching structures and can be realized in periodic poled lithium niobate or in GaAs. An interesting property of these structures is that new phase-matching processes appear in the 2D plane as compared to the 1D case. It is shown that these in-plane phase-matching resonances are given by a nonlinear Bragg law, and a related nonlinear Ewald construction. Applications as multiple-beam second-harmonic generation (SHG), ring cavity SHG, or multiple wavelength frequency conversion are envisaged.