Photoconductive THz Detector Based on New Functional Layers in Multi-Layer Heterostructures

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.

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Measurements of a MOSFET sub-THz detector integrated with rectangular patch antenna

2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz) ◽

10.1109/irmmw-thz.2014.6956514 ◽

2014 ◽

Author(s):

P. Kopyt ◽

P. Zagrajek ◽

D. Obrebski ◽

M. Bauwens ◽

N. S. Barker ◽

...

Keyword(s):

Patch Antenna ◽

Rectangular Patch ◽

Thz Detector

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A Bowtie Antenna Coupled Tunable Photon-Assisted Tunneling Double Quantum Well (DQW) THz Detector

MRS Proceedings ◽

10.1557/proc-692-h4.2.1 ◽

2001 ◽

Vol 692 ◽

Cited By ~ 1

Author(s):

Majid M. Khodier ◽

Christos G. Christodoulou ◽

Jerry A. Simmons

Keyword(s):

Quantum Well ◽

Coupling Efficiency ◽

Fast Response ◽

Thz Radiation ◽

Double Quantum ◽

Double Quantum Well ◽

Bowtie Antenna ◽

Thz Detection ◽

Assisted Tunneling ◽

Thz Detector

AbstractThe integration of a bowtie antenna with a double electron layer tunneling transistor (DELTT) device for the purposes of THz detection is investigated in this paper. The concept of THz detection, based on photon-assisted tunneling (PAT) between the two electron layers in a double quantum well (DQW) heterostructure, will be explained. The detector is expected to have narrowband, electrically tunable, fast response, and the possibility to operate at relatively high temperatures. Since the active area of the detector is very small, which is necessary to achieve fast response, it is not efficient in collecting THz radiation. Therefore, a broadband bowtie antenna is integrated with the detector to efficiently collect the THz radiation. Characteristics of different bowtie antenna geometries at THz frequencies were studied. An equivalent circuit model of the THz detector was developed, for the first time, to estimate the impedance characteristics at THz frequencies. Such a model is crucial for achieving impedance matching between the DELTT and the antenna to increase the overall coupling efficiency.

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