Second-harmonic generation from an array of sub-wavelength metal apertures
Second-harmonic generation from an array of sub-wavelength metal apertures
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DOI：
10.1088/1464-4258/7/2/016
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发表时间：
2005-02-01
期刊：
影响因子：
--
通讯作者：
Blair, S
中科院分区：
文献类型：
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作者：
Airola, M;Liu, Y;Blair, S
我们演示了二次谐波辐射的产生，通过周期性和无序阵列的亚波长金属孔传输。对于正方形晶格中的圆形孔，二次谐波信号在对应于800 nm波长的基本光束的增强透射的入射角处达到峰值，除了在局部对称性使孔的有效二阶非线性极化率最小化的小入射角处。即使通过周期性阵列的基本光束的线性传输可以比无序阵列大五倍以上，但是来自无序阵列的二次谐波的强度在大入射角处更大。通过使用非中心对称形状的孔来打破局部对称性，在小入射角的基本透射共振处发生二次谐波输出。
We demonstrate the generation of second-harmonic radiation in transmission through periodic and disordered arrays of sub-wavelength metallic apertures. For circular apertures in a square lattice, the second-harmonic signal peaks at incidence angles corresponding to enhanced transmission of the fundamental beam of 800 nm wavelength except at small incidence angles where the local symmetry minimizes the effective second-order nonlinear susceptibility of the apertures. Even though the linear transmission of the fundamental beam can be more than five times greater through the periodic array as compared to a disordered array, the strength of the second harmonic from the disordered array is greater at large incidence angles. By breaking the local symmetry through the use of apertures of non-centrosymmetric shape, the second-harmonic output occurs at fundamental transmission resonances at small incidence angles.