Thermoelectric graphene photodetectors with sub-nanosecond response times at terahertz frequencies
Journal article, 2020

Ultrafast and sensitive (noise equivalent power <1 nW Hz-1/2) light-detection in the terahertz (THz) frequency range (0.1-10 THz) and at room-temperature is key for applications such as time-resolved THz spectroscopy of gases, complex molecules and cold samples, imaging, metrology, ultra-high-speed data communications, coherent control of quantum systems, quantum optics and for capturing snapshots of ultrafast dynamics, in materials and devices, at the nanoscale. Here, we report room-temperature THz nano-receivers exploiting antenna-coupled graphene field effect transistors integrated with lithographically-patterned high-bandwidth (∼100 GHz) chips, operating with a combination of high speed (hundreds ps response time) and high sensitivity (noise equivalent power ≤120 pW Hz-1/2) at 3.4 THz. Remarkably, this is achieved with various antenna and transistor architectures (single-gate, dual-gate), whose operation frequency can be extended over the whole 0.1-10 THz range, thus paving the way for the design of ultrafast graphene arrays in the far infrared, opening concrete perspective for targeting the aforementioned applications.

2D materials

nano-detectors

terahertz frequencies

Author

Leonardo Viti

Scuola Normale Superiore di Pisa

Alisson R. Cadore

University of Cambridge

Xinxin Yang

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Andrei Vorobiev

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Jakob E. Muench

University of Cambridge

Kenji Watanabe

National Institute for Materials Science (NIMS)

Takashi Taniguchi

National Institute for Materials Science (NIMS)

Jan Stake

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

A. C. Ferrari

University of Cambridge

Miriam S. Vitiello

Scuola Normale Superiore di Pisa

Nanophotonics

21928614 (eISSN)

0255

Areas of Advance

Information and Communication Technology

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Subject Categories

Other Physics Topics

Nano Technology

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1515/nanoph-2020-0255

More information

Latest update

9/10/2020