Reflective scanning imaging based on a fast terahertz photodetector

Qiu, Fucheng; Tan, Zhongxin; Fu, Zhanglong; Wan, Wen‐Ming; Li, Mengqi; Wang, Chang; Cao, Juncheng

doi:10.1016/j.optcom.2018.06.030

Cited by 15 publications

(6 citation statements)

References 25 publications

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“…This problem is not unique to our single pixel THz imaging system. Pathways to solutions exist in the literature for systems similarly employing THz QCL sources and using a variety of detection schemes, including LFI [51,52], those utilising external detectors [71], and THz Radar [13]. In this respect, we emphasise here that our pulsed LFI scheme enjoys increased immunity to pixel motion artefacts which are commonly observed in fast scanner systems.…”

Section: Discussionmentioning

confidence: 99%

Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers

Lim¹,

Bertling²,

Taimre³

et al. 2019

Opt. Express

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We report a coherent terahertz (THz) imaging system that utilises a quantum cascade laser (QCL) operating in pulsed-mode as both the source and detector. The realisation of a short-pulsed THz QCL feedback interferometer permits both high peak powers and improved thermal efficiency, which enables the cryogen-free operation of the system. In this work, we demonstrated pulsed-mode swept-frequency laser feedback interferometry experimentally. Our interferometric detection scheme not only permits the simultaneous creation of both amplitude and phase images, but inherently suppresses unwanted background radiation. We demonstrate that the proposed system utilising microsecond pulses has the potential to achieve 0.25 mega-pixel per second acquisition rates, paving the pathway to video frame rate THz imaging. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Using a THz QCL as an illumination source allows for higher resolution imaging than sub-THz systems (due to the shorter wavelength) and many orders of magnitude more power (> 100 mW) than typical time-domain systems [26]. Therefore, the THz QCL is emerging as an obvious

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Section: Discussionmentioning

confidence: 99%

Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers

Lim¹,

Bertling²,

Taimre³

et al. 2019

Opt. Express

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show abstract

“…Tan Zhiyong et al from the Shanghai Institute of Microsystem and Information Technology (SIMIT) developed the fast scanning imaging system based on THz quantum devices [27].…”

Section: Scanning Imagingmentioning

confidence: 99%

Research Progress on Terahertz Quantum-Well Photodetector and Its Application

Shao

Tan

et al. 2021

Front. Phys.

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Compared with other typical terahertz (THz) detectors, the quantum-well photodetector (QWP) has the advantages of high detection sensitivity, fast response, mature fabrication, small size, and easy integration. Therefore, it is suitable for high-speed detection and imaging applications at the THz band. Researchers, both domestic and overseas, have systematically studied material design and device performance of the THz QWP. The design of the device is such that the peak frequency error is within 8%, the maximum peak responsibility is 5.5 A/W, the fastest response speed is 6.2 GHz, the best noise equivalent power is ∼10−13 W/Hz0.5, and the spectrum range is 2.5–6.5 THz. In this article, firstly the basic principles and theoretical calculations of the THz QWP are described, and then the research progress of the THz QWP in our research group at imaging and communication is reviewed, which looks forward to its future development.

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“…The imaging resolution is 0.4 mm. In order to further improve the imaging speed, in 2018, a scanning imaging system based on the fast rotation and translation structure was constructed by Qiu et al [121] A 4.3 THz QWP with fast detection performance and a 4.2 THz QCL with CW operation mode have been used in the above system. The fast scanning reflection imaging of a hidden leaf has been demonstrated, with a single frame imaging time of less than 10 s and a maximum of 5000 points per second scanning speed.…”

Section: -10 Imaging-based Positioning Spectral Analysismentioning

confidence: 99%

“…A resolution of 0.3 mm and a circular imaging region with a diameter of 100 mm were obtained. [121] Due to the failure of Si readout integrated circuits (ROICs) and the thermal mismatch between the photo-detector arrays and the ROICs at temperatures below 40 K, there are big technical challenges to construct terahertz photo-type focal plane arrays. In 2016, a pixel-less photo-type terahertz imager based on the frequency up-conversion technique [122] was demonstrated by Fu et al [123] The imager is composed of terahertz QWP and near-infrared (NIR) light emitting diodes (LEDs) which are called as QWP-LED and their materials are grown in sequence on the same substrates using MBE system.…”

Section: -10 Imaging-based Positioning Spectral Analysismentioning

confidence: 99%

Research progress in terahertz quantum-cascade lasers and quantum-well photodetectors

Tan¹,

Wan²,

Cao³

2020

Chinese Phys. B

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As semiconductor devices, the terahertz quantum-cascade laser is a coherent source based on intersubband transitions of unipolar carriers while the terahertz quantum-well photodetector is a kind of detector which matches the laser frequency. They are solid-state, electrically operated, and can be easily integrated with other components. This paper reviews the state of the art for the design, working performance, and future directions of the two devices. Their applications in photoelectric characterization and imaging are also discussed.

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Reflective scanning imaging based on a fast terahertz photodetector

Cited by 15 publications

References 25 publications

Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers

Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers

Research Progress on Terahertz Quantum-Well Photodetector and Its Application

Research progress in terahertz quantum-cascade lasers and quantum-well photodetectors

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