Nonlinear Wavefront Control with All-Dielectric Metasurfaces
Nonlinear Wavefront Control with All-Dielectric Metasurfaces
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DOI：
10.1021/acs.nanolett.8b01460
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发表时间：
2018-06-01
期刊：
影响因子：
10.8
通讯作者：
Kivshar, Yuri
中科院分区：
文献类型：
--
作者：
Wang, Lei;Kruk, Sergey;Kivshar, Yuri
超表面，纳米级谐振器的二维晶格，为功能性平面光学提供了独特的机会，并允许控制光的波前的透射、反射和偏振。最近，全电介质超颖表面达到了显着的效率，往往匹配或优于传统的光学元件。超颖表面的非线性光学响应的开发提供了非线性光学的范式转变，并且期望介电非线性超颖表面通过增强天然材料的基本非线性响应与非线性波的相位的有效控制相结合来丰富亚波长光子学。在这里，我们提出了一种新的和相当普遍的方法，工程的任意复杂的参数波的波前产生的非线性元表面。我们设计了全介质非线性超颖表面，实现了三次谐波场的高效波前控制，并演示了在设计角度下非线性光束的产生和非线性聚焦涡旋光束的产生。我们的非线性超颖表面在整个0-27 π相位范围内产生相位梯度，衍射效率为92%。
Metasurfaces, two-dimensional lattices of nanoscale resonators, offer unique opportunities for functional flat optics and allow the control of the transmission, reflection, and polarization of a wavefront of light. Recently, all-dielectric metasurfaces reached remarkable efficiencies, often matching or out-performing conventional optical elements. The exploitation of the nonlinear optical response of metasurfaces offers a paradigm shift in nonlinear optics, and dielectric nonlinear metasurfaces are expected to enrich subwavelength photonics by enhancing substantially nonlinear response of natural materials combined with the efficient control of the phase of nonlinear waves. Here, we suggest a novel and rather general approach for engineering the wavefront of parametric waves of arbitrary complexity generated by a nonlinear metasurface. We design all-dielectric nonlinear metasurfaces, achieve a highly efficient wavefront control of a third-harmonic field, and demonstrate the generation of nonlinear beams at a designed angle and the generation of nonlinear focusing vortex beams. Our nonlinear metasurfaces produce phase gradients over a full 0-27 pi phase range with a 92% diffraction efficiency.