A novel design of a tunable optical switch based on epsilon-near-zero (ENZ) metasurface is proposed, which can work as an electro-optical or an all-optical switch, and be tuned by gate-voltages, incident angles, and intensity of pump light. The result shows that the coupling of the ENZ mode and plasmon resonance lead to an obvious Rabi splitting which can be observed in the transmission spectrum. Numerical analysis also demonstrates that the coupling belongs to the ultra-strong coupling regime. The proposed design can achieve electro-optical switching with a large modulation depth of up to ∼ 17 dB, all-optical switching with an extinction ratio exceeding 5 dB and an ultrafast response time of 650 fs.

中文翻译：

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基于 Epsilon 近零超表面的可调谐电光和全光开关

提出了一种基于 epsilon-near-zero (ENZ) 超表面的可调谐光开关的新颖设计，它可以作为电光或全光开关工作，并通过栅极电压、入射角和强度进行调谐泵光。结果表明，ENZ 模式和等离子体共振的耦合导致明显的 Rabi 分裂，这可以在透射光谱中观察到。数值分析也表明该耦合属于超强耦合状态。所提出的设计可以实现高达 17 dB 的大调制深度的电光切换、消光比超过 5 dB 的全光切换和 650 fs 的超快响应时间。