论文标题
遗传优化发明了非对称反射率的非热势
Genetic optimization Invents non-Hermitian potentials for Asymmetric Reflectivity
论文作者
论文摘要
我们提出了一种基于遗传优化的一般设计策略，以实现含有介电和增益层层的周期性和非周期性平面结构中的不对称反射率。通过优化算法，可以从任何给定的和任意的真实（或虚构）介电常数分布中设计复杂介电常数分布的虚构（或真实）部分，即创建旨在实现所选光谱范围的单调光传输的非热势。实际上，获得的复杂介电常数分布的不对称响应与复杂介电常数平面中的面积直接相关。特别是，可以通过操作频率从左到右（或VICE）切换的方式设计单向光反射。此外，可以使用一堆介电层来实现这种可控的单向反射率，同时将折射率和损失保持在现实的值之内。
We propose a general design strategy based on genetic optimization to realize asymmetric reflectivity in periodic and non-periodic planar structures containing dielectric and gain-loss layers. By means of an optimization algorithm, it is possible to design the imaginary (or real) part of the complex permittivity distribution from any given and arbitrary real (or imaginary) permittivity distribution, i.e to create non-Hermitian potentials intended to achieve on-demand light transport for a selected spectral range. Indeed, the asymmetric response of the obtained complex permittivity distribution is directly related to its area in the complex permittivity plane. In particular, unidirectional light reflection can be designed in such a way that it switches from left to right (or vice versa) depending on the operating frequency. Moreover, such controllable unidirectional reflectivity can be realized using a stack of dielectric layers while keeping the refractive index and gain-loss within realistic values.
