Electrical Versus Optical: Comparing Methods for Detecting Terahertz Radiation Using Neon Lamps

Slocombe, Louie; Lewis, R. A.

doi:10.1007/s10762-018-0495-1

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…The current flowing in the tube and the brightness of the tube both increase as a result. Either phenomena may be tracked to monitor the terahertz radiation [39].…”

Section: Methodsmentioning

confidence: 99%

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A review of terahertz detectors

Lewis

2019

J. Phys. D: Appl. Phys.

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155

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Physics is the interplay of energy and matter. Energy, in the form of light, interacting with matter, principally in the solid state, underpins this topical review. The subject is developed carefully and methodically, beginning with basic definitions pertaining to terahertz detectors and terahertz radiation, then proceeding systematically to delineate characteristics of terahertz photons and terahertz detectors in more detail. In-between, the intimate connection linking terahertz sensors and terahertz sources is highlighted-an important aspect unfortunately often overlooked or ignored when terahertz detectors are discussed in isolation. At the centre of this topical review are the various physical mechanisms by which electromagnetic radiation of terahertz frequencies interacts with matter. The logic is to present first the underlying physical principles of detection before presenting the practical implementation in a specific device, rather than the other way around. A taxonomy of terahertz detectors is then proposed based on the underlying physical principles of detection. Following on from this classification, stateof-the-art terahertz detectors are surveyed and appraised; this overview constitutes the longest section of the review. Key detector parameters which inform applications are then presented and tabulated. Finally, the present state-of-the-art is anchored within the wider scientific context of historical developments and future prospects.

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“…The current flowing in the tube and the brightness of the tube both increase as a result. Either phenomena may be tracked to monitor the terahertz radiation [39].…”

Section: Methodsmentioning

confidence: 99%

“…Optical techniques may also be used to monitor the brightness of the lamp (Class A4b) [41][42][43]. In a recent comparison of the two readout methods, it was found that electrical readout provided a higher responsivity and lower noise but that optical readout was faster [39].…”

Section: Methodsmentioning

confidence: 99%

A review of terahertz detectors

Lewis

2019

J. Phys. D: Appl. Phys.

Self Cite

155

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“…The working principle of the detection circuit here is based on the electrical mode of detection. In this mode of operation, due to the incidence of MMW radiation and the resultant enhanced cascade ionization process within the GDD [ 17 ], a change in the bias current [ 18 ] will occur and those variations can be detected using a suitable data acquisition platform. One of the major reasons to use the electrical detection method is its better responsiveness while using GDDs as detector pixels.…”

Section: Introductionmentioning

confidence: 99%

Fast and Enhanced MMW Imaging System Using a Simple Row Detector Circuit with GDDs as Sensor Elements and an FFT-Based Signal Acquisition System

Kurup

Rozban

Abramovich

et al. 2023

Sensors

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The relatively high atmospheric propagation of millimeter-waves (MMW) was found to be one of the most critical reasons for the development of reliable sensors for MMW detection. According to previous research works, it has been already shown that incident MMW radiation on a glow discharge detector (GDD) can increase the discharge current. Hence, the electrical mode of detection can be employed to detect the presence of MMW radiation. In this article, a new design of a row detector using GDDs as pixel elements, and the influence of MMW incidence on GDD’s discharge current, were acquired using an elementary data acquisition (DAQ) platform. The DAQ system computes the averaged Fast Fourier Transform (FFT) spectrum of the time signal and returns the FFT results as magnitude based on the level of detection. An FFT-based signal acquisition proved to be a better alternative to the lock-in detection that was commonly used in MMW detection systems. This improved detection circuit provides enhanced noise filtering, thereby resulting in better MMW images within a short time. The overhead expense of the entire system is very low, as it can avoid lock-in amplifier stages that were previously used for signal enhancement. A scanning mechanism using a motorized translation stage (step motor) is involved to place and align the row detector in the image plane. The scanning can be carried out vertically to perform the imaging, by configuring the step motor after selecting the desired step size and position. A simplified version of the MMW detection circuit with a dedicated over-voltage protection facility is presented here. This made the detection system more stable and reliable during its operation. The MMW detection circuit demonstrated in this work was found to be a milestone to develop larger focal plane arrays (FPA) with very inexpensive sensor elements.

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Photoconductive Antennas for Terahertz Applications

Lewis

2022

Photoconductivity and Photoconductive Materials

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Electrical Versus Optical: Comparing Methods for Detecting Terahertz Radiation Using Neon Lamps

Cited by 9 publications

References 19 publications

A review of terahertz detectors

A review of terahertz detectors

Fast and Enhanced MMW Imaging System Using a Simple Row Detector Circuit with GDDs as Sensor Elements and an FFT-Based Signal Acquisition System

Photoconductive Antennas for Terahertz Applications

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