Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
Phys Rev Lett. 2011 Mar 11;106(10):105503. doi: 10.1103/PhysRevLett.106.105503. Epub 2011 Mar 8.
We introduce a metamaterial design composed of square plasmonic loops loaded by Kerr nonlinearities that combines enhanced nonlinear response with strong artificial magnetism, ensuring a negative refractive index with bistable and self-tunable response. We verify with full-wave simulations that positive-to-negative switching of refractive index may be obtained with moderate loss. The design of a finite-size metamaterial prism is also presented, supporting at the same frequency, and for the same light intensity, positive or inverted Snell refraction as a function of its previous excitation history.
我们介绍了一种由方形等离子体环组成的超材料设计，这些环上加载了 Kerr 非线性，这种设计将增强的非线性响应与强人工磁性结合在一起，确保了具有双稳和自可调响应的负折射率。我们通过全波模拟验证了，在中等损耗的情况下，折射率可以从正切换到负。我们还设计了一个有限尺寸的超材料棱镜，在同一频率下，对于相同的光强，可以根据其先前的激励历史，作为正或反斯涅尔折射的函数。
