Xu Tingjun, Jiao Xiaojin, Blair Steve
University of Utah, Department of Electrical and Computer Engineering Salt Lake City, UT 84112, USA.
Opt Express. 2009 Dec 21;17(26):23582-8. doi: 10.1364/OE.17.023582.
We measure third-harmonic generation (THG) from arrays of sub-wavelength metal apertures in transmission using fundamental input at 800 nm. Samples with different aperture spacings, sizes, and shapes are used. Strong angular dependence of THG is observed, with maxima located at incidence angles corresponding to extraordinary optical transmission (EOT) for the fundamental. We demonstrate an anomalous scaling of TH intensity with aperture size, where at different EOT peaks, the TH may either increase or decrease with aperture size. The aperture shape is also shown to have a strong effect on TH output.
我们使用800nm的基频输入光，在透射模式下测量亚波长金属孔径阵列的三次谐波产生（THG）。使用了具有不同孔径间距、尺寸和形状的样品。观察到THG具有强烈的角度依赖性，其最大值位于与基频的异常光传输（EOT）相对应的入射角处。我们展示了TH强度随孔径大小的反常标度关系，即在不同的EOT峰值处，TH可能随孔径大小增加或减小。孔径形状也被证明对TH输出有很大影响。
