Consiglio Nazionale delle Ricerche, CNR-SPIN 67100 L'Aquila, Italy.
Opt Lett. 2010 Jul 1;35(13):2130-2. doi: 10.1364/OL.35.002130.
We investigate propagation of a transverse magnetic field through a nonlinear metamaterial slab of subwavelength thickness and with a very small and negative linear dielectric permittivity. We prove that, for a given input intensity, the output intensity is a multivalued function of the field incidence angle so that the transmissivity exhibits angular multistability and a pronounced directional hysteresis behavior. The predicted directional hysteresis is a consequence of the fact that the linear and nonlinear contributions to the overall dielectric response can be comparable so that the electromagnetic matching conditions at the output slab boundary allow more than one field configuration within the slab to be compatible with the transmitted field.
我们研究了横磁场通过亚波长厚度的非线性超材料板的传播，该超材料板具有非常小且负的线性介电常数。我们证明，对于给定的输入强度，输出强度是场入射角度的多值函数，因此透过率表现出角度多稳定性和明显的方向滞后行为。预测的方向滞后是由于线性和非线性对整体介电响应的贡献可以相当，因此输出板边界的电磁匹配条件允许板内有多个场配置与传输场兼容的事实造成的。
