等离子体非线性伪二极管的演示验证
Demonstration of a plasmonic nonlinear pseudo-diode
AI总结：
本研究制备出铝银组合的非线性等离子体超表面，实现了类二极管的不对称二次谐波产生特性，实验测得10 dB消光比，揭示材料不对称引发的双各向异性响应，为非互易光子器件研究提供新支撑。
摘要：
我们演示了一种具有强不对称二次谐波产生（SHG）特性的非线性等离子体超表面：沿一个方向激发时非线性散射效率很高，而反向激发时该效应被显著抑制，从而实现类二极管功能。实验测得反向激发下SHG的消光比约为10 dB，全波模拟结果也验证了该发现。铝和银这两种常用金属的组合形成了材料组成不对称性，进而导致系统的双各向异性响应，均匀化分析及有效极化率张量提取结果均证实了这一点。最后，我们从互易性和时间反转不对称性的更基础视角讨论了本研究结果的意义。
英文摘要：
We demonstrate a nonlinear plasmonic metasurface that exhibits strongly asymmetric second-harmonic generation: nonlinear scattering is efficient upon excitation in one direction and it is substantially suppressed when the excitation direction is reversed, thus enabling a diode-like functionality. A significant (approximately 10 dB) extinction ratio of SHG upon opposite excitations is measured experimentally and those findings are substantiated with full-wave simulations. The combination of two commonly used metals - aluminium and silver - produces a material composition asymmetry that results into a bianisotropic response of the system, as confirmed by performing homogenization analysis and extracting an effective susceptibility tensor. Finally, we discuss the implications of our results from the more fundamental perspectives of reciprocity and time-reversal asymmetry.
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