4.7 Article

Thermoelectric graphene photodetectors with sub-nanosecond response times at terahertz frequencies

Journal

NANOPHOTONICS
Volume 10, Issue 1, Pages 89-98

Publisher

WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0255

Keywords

2D materials; nano-detectors; terahertz frequencies

Funding

  1. ERC Consolidator Grant SPRINT [681379]
  2. EU Horizon 2020 research programme Graphene Flagship [785219]
  3. ERC grant Hetero2D
  4. ERC grant GSYNCOR
  5. EPSRC [EP/L016087/1, EP/K01711X/1, EP/K017144/1]
  6. EPSRC [EP/K017144/1, EP/G042357/1, EP/K01711X/1, EP/S019367/1, EP/M507799/1, EP/P024947/1] Funding Source: UKRI
  7. European Research Council (ERC) [681379] Funding Source: European Research Council (ERC)

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In the terahertz frequency range and at room temperature, ultrafast and sensitive light detection is achieved using antenna-coupled graphene field effect transistors integrated with high-bandwidth chips, paving the way for various applications such as time-resolved spectroscopy and quantum control.
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 (similar to 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.

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