HBN-encapsulated, graphene-based room-temperature terahertz receivers with high speed and low noise

Abstract

Uncooled Terahertz (THz) photodetectors (PDs) showing fast (ps) response and high sensitivity (noise equivalent power (NEP) < $nWH{z}^{-1/2}$) over a broad (0.5THz-10THz) frequency range are needed for applications in high-resolution spectroscopy (relative accuracy ~ $10^{-11}$), metrology, quantum information, security, imaging, optical communications. However, present THz receivers cannot provide the required balance between sensitivity, speed, operation temperature and frequency range. Here, we demonstrate an uncooled THz PD combining the low (~2000 $k_B\mu m^{-2}$) electronic specific heat of high mobility (> 50000 $c{m}^2{V}^{-1}{s}^{-1}$) hBN-encapsulated graphene with the asymmetric field-enhancement produced by a bow-tie antenna resonating at 3 THz. This produces a strong photo-thermoelectric conversion, which simultaneously leads to a combination of high sensitivity (NEP $\le$ 160 $pWH{z}^{-1/2}$), fast response time ($\le 3.3ns$) and a four orders of magnitude dynamic range, making our devices the fastest, broadband, low noise, room temperature THz PD to date.

This is the unedited authors' version of the submitted article, published in its final form at http://dx.doi.org/10.1021/acs.nanolett.9b05207 16 Pages, 4 Figures

References in corpus (14)

• Two Dimensional Atomic Crystals
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Thermal properties of graphene: Fundamentals and applications
• Graphene field effect transistors as room-temperature Terahertz detectors
• Realization of a High Mobility Dual-gated Graphene Field Effect Transistor with Al2O3 Dielectric
• Graphene-Based Integrated Photonics For Next-Generation Datacom And Telecom
• Phonon Linewidths and Electron Phonon Coupling in Nanotubes
• Electron Transport and Hot Phonons in Carbon Nanotubes
• Fast and Sensitive Terahertz Detection Using an Antenna-Integrated Graphene pn Junction
• Electron-phonon heat transfer in monolayer and bilayer graphene
• Femtosecond photo-switching of interface polaritons in black phosphorus heterostructures
• HBN-encapsulated, graphene-based room-temperature terahertz receivers with high speed and low noise
• Thermoelectric terahertz photodetectors based on selenium-doped black phosphorus flakes
• Phase-sensitive terahertz imaging using room-temperature near-field nanodetectors

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• Tailored nano-electronics and photonics with two-dimensional materials at terahertz frequencies
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• Unveiling the detection dynamics of semiconductor nanowire photodetectors by terahertz near-field nanoscopy