论文标题
奇异元流的第二次谐波一代
Second-harmonic generation from singular metasurfaces
论文作者
论文摘要
我们介绍了从单数跨表面的第二次谐波一代的理论研究。奇异的元面与入射光强烈相互作用，在该灯光下，大场增强形成了强烈的表面极化，从而产生了第二谐波场。通过使用转换光学元件，将非线性光学响应的计算从元图框架转换为简单的平板几何形状的计算，从而大大降低了问题的复杂性。此外，奇异的跨表面对光的入射角表现出弱的依赖性，该角度可以用作谐波世代的全角设备。最后，我们研究了奇异跨表面在远场中第二谐波产生的对称依赖性，并通过破坏表面反转对称性来展示如何在正常入射率下提高转化效率。
We present a theoretical study of second-harmonic generation from a singular metasurface. The singular metasurfaces strongly interact with the incident light, where the large field enhancement forms an intense surface polarization that generates the second-harmonic field. By using transformation optics, the calculation of nonlinear optical response is converted from the metasurface frame to that of a simple slab geometry, largely reducing the complexity of the problem. In addition, the singular metasurface exhibits a weak dependence on the incident angle of light, which can be potentially used as an all-angle device for harmonic generations. Finally, we study the symmetry dependence of second-harmonic generation in the far field for the singular metasurface and show how to enhance the conversion efficiency under normal incidence by breaking the surface inversion symmetry.
