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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Room-Temperature Plasmon-Assisted Resonant THz Detection in Single-Layer Graphene Transistors.
José M Caridad1,2, Óscar Castelló1,2, Sofía M López Baptista1
1Department of Applied Physics, University of Salamanca, Salamanca 37008, Spain.
Nano Letters
|January 2, 2024
Summary
Room-temperature terahertz (THz) detection is achieved using graphene photodetectors. This breakthrough enables frequency-selective THz sensing at ambient conditions, overcoming previous temperature limitations.
Area of Science:
- Optoelectronics
- Condensed Matter Physics
- Nanotechnology
Background:
- Frequency-selective terahertz (THz) photodetectors are crucial for nanoscale light manipulation.
- Plasmonic resonance in gate-tunable phototransistors offers promising THz detection capabilities.
- Plasmon-assisted resonances in THz detectors have been limited to cryogenic temperatures.
Purpose of the Study:
- To demonstrate room-temperature resonant detection of THz radiation.
- To investigate the potential of graphene-based photodetectors for THz sensing applications.
- To overcome the limitations of cryogenic temperatures in plasmonic THz detectors.
Main Methods:
- Fabrication of short-channel gated photodetectors using high-quality single-layer graphene.
- Utilizing plasmonic resonances for frequency-selective THz detection.
- Investigating the role of electron-phonon scattering in device performance at room temperature.
Main Results:
- Successful demonstration of room-temperature resonant THz detection.
- Observation of plasmon-assisted resonance signatures in graphene photodetectors at ambient conditions.
- Attribution of the resonant regime survival to weak electron-phonon scattering in monolayer graphene.
Conclusions:
- Single-layer graphene photodetectors can achieve frequency-selective THz detection at room temperature.
- The weak electron-phonon scattering in graphene is key to maintaining plasmon oscillations at ambient temperatures.
- This work paves the way for practical, room-temperature THz sensing technologies.
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