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

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