Magnetic-free nonreciprocal photonic platform based on time-modulated graphene capacitors
Magnetic-free nonreciprocal photonic platform based on time-modulated graphene capacitors
复制标题
DOI：
10.1103/physrevb.98.165428
复制
发表时间：
2018-10-19
影响因子：
3.7
通讯作者：
Gomez-Diaz, J. S.
中科院分区：
文献类型：
--
作者：
Correas-Serrano, D.;Alu, A.;Gomez-Diaz, J. S.
我们提出了一种基于时间调制石墨烯电容器耦合到光子波导的非互易光子器件的实现范例，而不依赖于磁光效应。所得的混合石墨烯-电介质平台是低损耗的，硅兼容的，对石墨烯缺陷鲁棒的，可从太赫兹扩展到近红外频率，并且它使用现实的偏置方案表现出大的非互易响应。我们介绍了一个分析框架的基础上解决本征态的调制结构和空间耦合模理论，揭示了物理机制，使非互易性，并使快速分析和设计的最佳隔离器的几何形状的基础上合成的线性和角动量偏置。通过谐波平衡全波仿真验证了我们的结果，证实了低损耗（
We propose a paradigm for the realization of nonreciprocal photonic devices based on time-modulated graphene capacitors coupled to photonic waveguides, without relying on magneto-optic effects. The resulting hybrid graphene-dielectric platform is low loss, silicon compatible, robust against graphene imperfections, scalable from terahertz to near-infrared frequencies, and it exhibits large nonreciprocal responses using realistic biasing schemes. We introduce an analytical framework based on solving the eigenstates of the modulated structure and on spatial coupled mode theory, unveiling the physical mechanisms that enable nonreciprocity and enabling a quick analysis and design of optimal isolator geometries based on synthetic linear and angular momentum bias. Our results, validated through harmonic-balance full-wave simulations, confirm the feasibility of the introduced low-loss (