Thermoelectric graphene photodetectors with sub-nanosecond response times at terahertz frequencies
Artikel i vetenskaplig tidskrift, 2020

Ultrafast and sensitive (noise equivalent power <1 nW/Hz^0.5) 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^0.5) 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.

terahertz frequencies

power detectors

2D materials

Författare

Leonardo Viti

Alisson R. Cadore

Xinxin Yang

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Andrei Vorobiev

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Jakob E. Muench

Kenji Watanabe

Takashi Taniguchi

Jan Stake

Chalmers, Mikroteknologi och nanovetenskap (MC2), Terahertz- och millimetervågsteknik

Andrea C. Ferrari

Miriam C. Vitiello

Nanophotonics

21928614 (eISSN)

Vol. 9

Styrkeområden

Informations- och kommunikationsteknik

Nanovetenskap och nanoteknik (SO 2010-2017, EI 2018-)

Ämneskategorier

Nanoteknik

Annan elektroteknik och elektronik

DOI

10.1515/nanoph-2020-0255

Mer information

Skapat

2020-07-10