Abstract
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.
Highlights
Optical switches, as an essential component of optical logic gates and related devices, hold the key to on-chip ultrafast optical connection networks as well as integrated photonic circuits [1]
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
We propose a tunable dual-function optical switch based on the epsilon-near-zero metasurface in the near-infrared region
Summary
As an essential component of optical logic gates and related devices, hold the key to on-chip ultrafast optical connection networks as well as integrated photonic circuits [1]. The current state-of-the-art design of optical switches includes photonic crystal nanocavities [2], [3], surface plasmon polaritons [4], metamaterials [5], [6], microring resonators [7], [8] and etc. Their outstanding performance include high switching efficiency and speed, low power consumption and integration size, as compared to traditional electronic switches.
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