High-speed metasurface modulator using critically coupled bimodal plasmonic resonance

TL;DR

This paper demonstrates a high-speed, near-infrared plasmonic metasurface electro-optic modulator with gigahertz bandwidth, achieving near-perfect absorption and significant modulation depth through critical coupling of bimodal plasmonic resonance.

Contribution

The work introduces a novel critically coupled bimodal plasmonic resonance design in a metasurface for ultrafast electro-optic modulation at gigahertz frequencies.

Findings

Achieved 99.8% absorption at 1650 nm

Demonstrated 1.25 GHz modulation bandwidth

Realized 9.5 dB modulation depth under ±30 V

Abstract

Free-space electro-optic (EO) modulators operating at gigahertz and beyond are attractive for a wide range of emerging applications, including high-speed imaging, free-space optical communication, microwave photonics, and diffractive computing. Here we experimentally demonstrate a high-speed plasmonic metasurface EO modulator operating at a near-infrared wavelength range with a gigahertz modulation bandwidth. To achieve efficient intensity modulation of reflected light from an ultrathin metasurface layer, we utilize the bimodal plasmonic resonance inside a subwavelength metal-insulator-metal grating, which is precisely tuned to satisfy the critical coupling condition. As a result, perfect absorption of -27 dB (99.8%) and a high quality (Q) factor of 113 are obtained at a resonant wavelength of 1650 nm. By incorporating an EO polymer inside the grating, we achieve a modulation depth of up to 9.5 dB under an applied voltage of $\pm$30 V. The 3-dB modulation bandwidth is confirmed to be 1.25 GHz, which is primarily limited by the undesired contact resistance. Owing to the high electrical conductivity of metallic gratings and a compact device structure with a minimal parasitic capacitance, the demonstrated device can potentially operate at several tens of gigahertz, which opens up exciting opportunities for ultrahigh-speed active metasurface devices in various applications.