Low‐noise heterodyne detection of terahertz waves at room temperature using zero‐biased Fermi‐level managed barrier diode

2018 ◽  
Vol 54 (18) ◽  
pp. 1080-1082 ◽  
Author(s):  
H. Ito ◽  
T. Ishibashi
Keyword(s):  
Fermi Level ◽  
Room Temperature ◽  
Low Noise ◽  
Heterodyne Detection ◽  
Terahertz Waves

scholarly journals Fabrication of Graphene Nanomesh FET Terahertz Detector

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 641
Author(s):  
Yuan Zhai ◽  
Yi Xiang ◽  
Weiqing Yuan ◽  
Gang Chen ◽  
Jinliang Shi ◽  
...  
Keyword(s):  
Room Temperature ◽  
Energy Gap ◽  
Coupling Efficiency ◽  
High Sensitivity ◽  
Fabrication Process ◽  
Monolayer Graphene ◽  
Terahertz Waves ◽  
Wet Process ◽  
Graphene Nanomesh ◽  
Thz Detector

High sensitivity detection of terahertz waves can be achieved with a graphene nanomesh as grating to improve the coupling efficiency of the incident terahertz waves and using a graphene nanostructure energy gap to enhance the excitation of plasmon. Herein, the fabrication process of the FET THz detector based on the rectangular GNM (r-GNM) is designed, and the THz detector is developed, including the CVD growth and the wet-process transfer of high quality monolayer graphene films, preparation of r-GNM by electron-beam lithography and oxygen plasma etching, and the fabrication of the gate electrodes on the Si3N4 dielectric layer. The problem that the conductive metal is easy to peel off during the fabrication process of the GNM THz device is mainly discussed. The photoelectric performance of the detector was tested at room temperature. The experimental results show that the sensitivity of the detector is 2.5 A/W (@ 3 THz) at room temperature.

scholarly journals Giant controllable gigahertz to terahertz nonlinearities in superlattices

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
M. F. Pereira ◽  
V. Anfertev ◽  
Y. Shevchenko ◽  
V. Vaks
Keyword(s):  
Room Temperature ◽  
Current Flow ◽  
Excitation Power ◽  
Design Tool ◽  
Heterodyne Detection ◽  
Nonlinear Susceptibility ◽  
Optical Nonlinearities ◽  
Clear Cut ◽  
Thz Range ◽  
Predictive Design

Abstract Optical nonlinearities are of perpetual importance, notably connected with emerging new materials. However, they are difficult to exploit in the gigahertz–terahertz (GHz–THz) range at room temperature and using low excitation power. Here, we present a clear-cut theoretical and experimental demonstration of real time, low power, room temperature control of GHz–THz nonlinearities. The nonlinear susceptibility concept, successful in most materials, cannot be used here and we show in contrast, a complex interplay between applied powers, voltages and asymmetric current flow, delivering giant control and enhancement of the nonlinearities. Semiconductor superlattices are used as nonlinear sources and as mixers for heterodyne detection, unlocking their dual potential as compact, room temperature, controllable sources and detectors. The low input powers and voltages applied are within the range of compact devices, enabling the practical extension of nonlinear optics concepts to the GHz–THz range, under controlled conditions and following a predictive design tool.

Low-noise room-temperature wideband parametric amplifiers

1971 ◽  
Vol 7 (22) ◽  
pp. 657 ◽  
Author(s):  
J.C. Vokes ◽  
J.R. Dawsey ◽  
H.A. Deadman
Keyword(s):  
Room Temperature ◽  
Low Noise ◽  
Parametric Amplifiers

scholarly journals Room Temperature Direct and Heterodyne Detection of 0.28–0.69-THz Waves Based on GaN 2-DEG Unipolar Nanochannels

2016 ◽  
Vol 63 (1) ◽  
pp. 353-359 ◽  
Author(s):  
Carlos Daher ◽  
Jeremie Torres ◽  
Ignacio Iniguez-de-la-Torre ◽  
Philippe Nouvel ◽  
Luca Varani ◽  
...  
Keyword(s):  
Room Temperature ◽  
Heterodyne Detection ◽  
Thz Waves
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