Ferroelectric superdomain controlled graphene plasmon for tunable mid-infrared photodetector with dual-band spectral selectivity

TL;DR

This paper introduces a tunable graphene-based dual-band infrared photodetector controlled by ferroelectric superdomains, offering a low-cost, room-temperature solution with high responsivity for advanced infrared imaging and detection applications.

Contribution

It demonstrates a novel ferroelectric superdomain-driven approach to achieve dual-band spectral selectivity in graphene plasmonic photodetectors, overcoming complex fabrication challenges of traditional methods.

Findings

Tunable dual-band photoresponse in 3.7-16.3 μm and 15.1-52.1 μm ranges.

Ultrahigh responsivities of 667-1080 A/W at room temperature.

Simple, low-cost fabrication with potential for infrared imaging applications.

Abstract

Dual-band infrared photodetectors (DBIPs) can discriminate desired signals from complex scenes and thus are highly expected for threat-warning, remote sensing, and astronomy applications. Conventional DBIPs with high-performances are, however, typically based on semiconductor thin films, but remain the challenges of complex spatial align, expensive growth and cooling requirement. Here, we report a tunable graphene plasmonic photodetector with dual-band infrared spectral selectivity driven by ferroelectric superdomain. The periodic ferroelectric polarization array with nanoscale ring shapes provides ultrahigh electrostatic field for spatially doping of monolayer graphene to desired patterns, and is further used to excite and confine intrinsic graphene plasmons. Our devices exhibit tunable resonance photoresponse in both two bands of 3.7-16.3 um and 15.1-52.1 um. The numerical calculations show that our devices own ultrahigh responsivities of 667-1080 A W-1 at room temperature in range of 5-50 um. Our devices make possible the applications of infrared imaging system and both stationary and motion state of objects detection. These investigations provide a novel approach for advanced infrared system construction by employing simple, low-cost, uncooling multispectral detectors array.