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Title(s)
Title | Language |
8x8 Patch-Antenna-Coupled TeraFET Detector Array for Terahertz Quantum-Cascade-Laser Applications | en |
Author(s)
Name | ORCID | GND | Affiliation |
North, Nicholas K. | |||
Horbury, Michael D. | |||
Kondawar, Sanchit | |||
Kundu, Iman | |||
Salih, Mohammed | |||
Krysl, Anastasiya | |||
Li, Lianhe | |||
Linfield, Edmund H. | |||
Freeman, Joshua R. | |||
Valavanis, Alexander | |||
Lisauskas, Alvydas | |||
Roskos, Hartmut G. | 119965938X |
Project(s)
DFG SPP 2314 INTEREST RO 770 49-1
UK Research and Innovation (Future Leader Fellowship MR/S016929/1)
Engineering and Physical Sciences Research Council (EPSRC), U.K. (Programme grant EP/W012472/1)
Faculty
13 Physics
Date Issued
10 April 2024
Publisher(s)
Goethe-Universität Frankfurt
Type(s) of data
Dataset
Language(s)
en
Abstract(s)
Abstract | Language |
Monolithically integrated, antenna-coupled field-effect transistors (TeraFETs) represent sensitive and fast detectors operable at room temperature, designed to detect radiation across the terahertz range (0.3~THz to 10~THz). For this study, we conducted an experimental characterization of a single monolithically integrated patch-antenna coupled TeraFET optimized for maximum sensitivity at 3.4~THz. This characterization utilized a single-mode high-power terahertz Quantum-Cascade-Laser (QCL) emitting at the designated frequency. Subsequently, we integrated 8x8 of the aforementioned monolithically integrated patch-antenna-coupled TeraFET elements into a parallel readout circuitry, facilitated by the process maturity of a commercial 65-nm process node. This configuration, referred to as the "multi-element" terahertz detector, stands in contrast to conventional detector matrices where each TeraFET represents a pixel. Here, the entire TeraFET network operates as a unified pixel, amalgamating the output signals of all rectifying elements. For the multi-element detector presented here, we emphasize two significant enhancements for sensitive power detection experiments involving a 2.85~THz and a 3.4~THz single-mode quantum-cascade laser (QCL). First, the larger effective detector area improves detector alignment and signal stability with regards to vibrations. Additionally, the 8x8 array configuration provides a significantly reduced source-drain resistance of approximately 300~$\Omega$ at the most sensitive working bias point, which is determined to be at a gate-source bias of approx. 0.6~V in case of the single element. The decreased load impedance results in a substantial reduction in (thermal) detector noise and an increase in the attainable modulation bandwidth, particularly when coupled with a low-noise voltage amplifier circuit. Building upon the introduced approaches, we present a TeraFET-based detector system implementation that achieves a -3~dB modulation bandwidth of 15~MHz around the most sensitive bias point, with the potential to extend up to 20~MHz by further reducing detector impedance through adjustments in the applied gate potential (as depicted in \autoref{fig:RDS_noise_analysis}). Finally, we validate the system's performance using high-resolution spectroscopy data to investigating methanol vapor around 3.4~THz. | en |
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