Inexpensive detector for terahertz imaging

Abramovich, Amir; Kopeika, Norman S.; Rozban, Daniel; Farber, E.

doi:10.1364/ao.46.007207

Cited by 84 publications

(48 citation statements)

References 9 publications

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“…Their high sensitivity to THz radiation has been recently reported [1], and is similar to that of pyroelectric detectors and Golay cells. In detector operation, the indicator lamps are biased with a direct current to break the gas down.…”

Section: Introductionsupporting

confidence: 62%

“…The detected signal is the modulation of the RF energy, which can be separated from the DC bias with a capacitor. Measurements of the noise equivalent power (NEP) at 100 GHz with 1 kHz modulation were carried out and found to be W/ Hz [1]. We anticipate NEP improvement for frequency modulation of 100 kHz to W/ Hz and lower, because of greatly reduced noise [1]- [3].…”

Section: Introductionmentioning

confidence: 93%

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THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

2009

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The detection mechanism of glow discharge plasma in neon indicator lamps has been investigated in the terahertz and microwave spectral regions. The influence of the THz radiation polarization on the responsivity of glow discharge detectors (GDD) is considered here. There are two detection mechanisms in the GDD that exist simultaneously, each at the expense of the other. Experiments with GDD neon indicator lamps in the THz regime prove that the dominant detection mechanism of the GDD is enhanced cascade ionization rather than enhanced diffusion current. Our polarization experiments in the THz regime show that when the electric field of the THz radiation is in the same direction as the DC bias electric field of the lamp, the responsivity is about 50% higher than when the THz electric field is orthogonal to the DC field. This supports the concept that the dominant detection mechanism of the GDD in the THz regime is enhanced cascade ionization.

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Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 93%

THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

2009

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“…The phosphor coating introduces an additional pathway for further photoexcitation by the fluorescent photons. The additional pathway feeds back into the gain mechanism, further enhancing the signal [23] and so leading to a non-linear response.…”

Section: Optical Detectionmentioning

confidence: 99%

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

Slocombe

Lewis

2018

J Infrared Milli Terahz Waves

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Terahertz radiation impinging on a lit neon tube causes additional ionization of the encapsulated gas. As a result, the electrical current flowing between the electrodes increases and the glow discharge in the tube brightens. These dual phenomena suggest two distinct modes of terahertz sensing. The electrical mode simply involves measuring the electrical current. The optical mode involves monitoring the brightness of the weakly ionized plasma glow discharge. Here, we directly compare the two detection modes under identical experimental conditions. We measure 0.1-THz radiation modulated at frequencies in the range 0.1-10 kHz, for lamp currents in the range 1-10 mA. We find that electrical detection provides a superior signal-tonoise ratio while optical detection has a faster response. Either method serves as the basis of a compact, robust, and inexpensive room-temperature detector of terahertz radiation.

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“…A candidate for THz FPA pixels is miniature neon indicator lamps N523 of international light technology (Peabody, MA) which was tested experimentally and found to be a very good THz detector [2]. Its NEP is on the order of 10 -9 W/Hz 1/2 , and rise time is on the order of a microsecond and less.…”

Section: Introductionmentioning

confidence: 99%

Measurements and simulations of the optical parameters of the Glow Discharge Detector (GDD) Focal Plane Array (FPA) millimeter wavelength imaging system

Shilemay

Rozban

Levanon

et al. 2011

2011 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS 2011)

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The optical parameters of millimeter wavelength (MMW) imaging system are under investigation in this study. The Optical Transfer Function (OTF) was measured and simulated in this study. The performance and quality of the MMW imaging system were tested using point source objects and Point Spread Function (PSF) was obtained. The MMW imaging system is composed of large aperture 500 mm spherical mirror, CW MMW source and 8X8 Glow Discharge Detector (GDD) Focal Plane Array (FPA). In order to investigate the above optical parameters a diagonal mirror was used in order to allow vertically placing of objects rather than horizontally. In order to avoid stray light, absorber materials were placed around the quasi-optic set-up. Special metal resolution charts and point source objects were manufactured and imaged. The influence of the diffraction has been taken care in the calculations and simulations. The experimental results showed very good agreement with the simulations and calculations results.

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Inexpensive detector for terahertz imaging

Cited by 84 publications

References 9 publications

THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

THz Polarization Effects on Detection Responsivity of Glow Discharge Detectors (GDDs)

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

Measurements and simulations of the optical parameters of the Glow Discharge Detector (GDD) Focal Plane Array (FPA) millimeter wavelength imaging system

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