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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Inexpensive detector for terahertz imaging.

A Abramovich¹, N S Kopeika, D Rozban

¹Department of Electrical and Electronic Engineering, Ariel University Center of Samaria, Ariel, Israel. amir007@yosh.ac.il

|October 13, 2007

Summary

Glow discharge plasma offers an inexpensive terahertz (THz) room-temperature detector solution. These detectors show good responsivity and noise-equivalent power, with detection via enhanced diffusion current.

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Area of Science:

Plasma Physics
Terahertz Technology
Detector Development

Background:

Terahertz (THz) radiation detection typically requires complex and expensive systems.
Glow discharge plasma, a form of direct-current gas breakdown, presents an alternative medium for THz detection.
Room-temperature operation is a key goal for practical THz applications.

Purpose of the Study:

To investigate glow discharge plasma as a basis for an inexpensive room-temperature terahertz detector.
To evaluate the performance characteristics of glow discharge indicator lamps for THz detection.
To understand the underlying physical mechanism responsible for THz detection in glow discharge devices.

Main Methods:

Utilizing glow discharge indicator lamps as room-temperature detectors for terahertz radiation.

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Measuring responsivity and noise-equivalent power of the glow discharge detectors.

Analyzing the change in bias current under THz radiation to elucidate the detection mechanism.

Main Results:

Glow discharge indicator lamps demonstrated good responsivity and noise-equivalent power for THz detection.
The cost-effectiveness of glow discharge detectors (approx. $0.2-$0.5 per lamp) makes them suitable for focal plane array (FPA) development.
The detection mechanism was identified as an enhanced diffusion current, leading to a decrease in bias current upon THz exposure.

Conclusions:

Glow discharge plasma is a viable and cost-effective technology for developing inexpensive terahertz room-temperature detectors.
The enhanced diffusion current mechanism provides a clear pathway for THz signal detection.
The low cost and promising performance suggest potential for glow discharge detectors in THz imaging applications, including diffraction-limited FPAs.