Nonlinearly tunable Fano resonance in photonic crystal heterostructure with embedded a varactor-loaded split ring resonator
Nonlinearly tunable Fano resonance in photonic crystal heterostructure with embedded a varactor-loaded split ring resonator
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DOI：
10.1063/5.0163405
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发表时间：
2023-08
影响因子：
3.2
通讯作者：
Lei Gao;Lei Yang;Rui Jiang;Ya-qiong Ding;Yu Fang;Xingzhi Wu;J. Ran;Qian Wu;Yongqi Sun
中科院分区：
文献类型：
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作者：
Lei Gao;Lei Yang;Rui Jiang;Ya-qiong Ding;Yu Fang;Xingzhi Wu;J. Ran;Qian Wu;Yongqi Sun
本文通过实验和数值方法研究了微带光子晶体（PC）异质结构与变容负载分环谐振器（SRR）集成后的fano型干涉效应。这种效应利用了PC异质结构提供宽连续频谱的能力，而嵌入式SRR提供窄离散路径。通过这些元件之间的相干干涉，出现了明显的不对称法诺型传输频谱，并伴有明显的群延迟。此外，复合结构在Fano谐振频率处表现出电场增强，增强了透射谱的非线性灵敏度。Fano谐振的非线性可调性是通过应用不同的输入功率来证明的，允许在微波状态下实现高性能的双稳态电磁开关和二极管。由于PC异质结构中的Fano谐振机制，所提出的配置具有显著的传输对比度，低阈值强度和相对较高的传输幅度等关键特征，所有这些都在紧凑的器件体积内。该设计为在微或纳米光子电路中实现有源超材料辅助元件铺平了道路，在先进的光学器件中具有潜在的应用前景。
The study explores the Fano-type interference effect in a microstrip photonic crystal (PC) heterostructure integrated with a varactor-loaded split ring resonator (SRR), both experimentally and numerically. This effect capitalizes on the PC heterostructure’s ability to provide a broad continuous spectrum, while the embedded SRR offers a narrow discrete pathway. Through coherent interference between these elements, a sharp asymmetric Fano-type transmission spectrum emerges, accompanied by a notable group delay. Furthermore, the composite configuration exhibits an electric field enhancement at the Fano resonant frequency, enhancing the nonlinear sensitivity of the transmission spectrum. The nonlinear tunability of the Fano resonance is demonstrated by applying distinct input powers, allowing for the realization of a high-performance bistable electromagnetic switch and diode in the microwave regime. The proposed configuration exhibits key features such as significant transmission contrast, low threshold intensity, and relatively high transmission amplitude, all within a compact device volume, thanks to the Fano resonant mechanism in the PC heterostructure. This design paves the way for the implementation of active metamaterials-assisted components in micro- or nano-photonic circuits, with potential applications in advanced optical devices.