title: Efficient Terahertz detection in black-phosphorus nano-transistors with selective and controllable plasma-wave, bolometric and thermoelectric response.
abstract: The ability to convert light into an electrical signal with high efficiencies and controllable dynamics, is a major need in photonics and optoelectronics. In the Terahertz (THz) frequency range, with its exceptional application possibilities in high data rate wireless communications, security, night-vision, biomedical or video-imaging and gas sensing, detection technologies providing efficiency and sensitivity performances that can be "engineered" from scratch, remain elusive. Here, by exploiting the inherent electrical and thermal in-plane anisotropy of a flexible thin flake of black-phosphorus (BP), we devise plasma-wave, thermoelectric and bolometric nano-detectors with a selective, switchable and controllable operating mechanism. All devices operates at room-temperature and are integrated on-chip with planar nanoantennas, which provide remarkable efficiencies through light-harvesting in the strongly sub-wavelength device channel. The achieved selective detection (∼5-8 V/W responsivity) and sensitivity performances (signal-to-noise ratio of 500), are here exploited to demonstrate the first concrete application of a phosphorus-based active THz device, for pharmaceutical and quality control imaging of macroscopic samples, in real-time and in a realistic setting.
authors: NEST, Istituto Nanoscienze - CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, I-56127.
authors: Leonardo
authors: L
authors: Viti
authors: Department of Physics and Engineering Physics, Tulane University, New Orleans, LA-70118, USA.
authors: Jin
authors: J
authors: Hu
authors: Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, France.
authors: Dominique
authors: D
authors: Coquillat
authors: Università degli Studi della Calabria, Dipartimento di Fisica, via Ponte Bucci, 87036 Rende (CS), Italy.
authors: Antonio
authors: A
authors: Politano
authors: Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, France.|Institute of High Pressure Institute Physics Polish Academy of Sciences Warsaw Poland.
authors: Wojciech
authors: W
authors: Knap
authors: NEST, Istituto Nanoscienze - CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, I-56127.
authors: Miriam S
authors: MS
authors: Vitiello
mesh_terms: D004867:Equipment Design; D050997:Nanomedicine / Q000295:instrumentation*; D055095:Optics and Photonics; D010758:Phosphorus; D059629:Signal-To-Noise Ratio; D055069:Terahertz Imaging / Q000295:instrumentation*; D055053:Terahertz Radiation; D014173:Transistors, Electronic
chemical_list: D010758:Phosphorus