Uncooled bolometer-type Terahertz focal plane array and camera for real-time imaging

Oda, Naoki

doi:10.1016/j.crhy.2010.05.001

Cited by 130 publications

(64 citation statements)

References 10 publications

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“…Furthermore, if occlusion is an issue as shown earlier (16), the region of interest may give erroneous data due to the dynamic nature of the sample and the sequential process of acquisition. One option to increase imaging speed is to synchronously acquire multiple pixels at once through the use of an array of emitters and/or detectors and there have been some significant improvements presented recently on the development of efficient microbolometer arrays for detection (44)(45)(46). However, such arrays are not suitable for time-domain imaging as they have limited ability to capture the spectral information available, and arrays of time-domain sources and detectors remain expensive and difficult to fabricate.…”

Section: Imaging Speedmentioning

confidence: 99%

Recent advances in terahertz technology for biomedical applications

Sun¹,

He²,

Li³

et al. 2017

Quant. Imaging Med. Surg.

230

113

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Terahertz instrumentation has improved significantly in recent years such that THz imaging systems have become more affordable and easier to use. THz systems can now be operated by non-THz experts greatly facilitating research into many potential applications. Due to the non-ionising nature of THz light and its high sensitivity to soft tissues, there is an increasing interest in biomedical applications including both in vivo and ex vivo studies. Additionally, research continues into understanding the origin of contrast and how to interpret terahertz biomedical images. This short review highlights some of the recent work in these areas and suggests some future research directions.

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Section: Imaging Speedmentioning

confidence: 99%

Recent advances in terahertz technology for biomedical applications

Sun¹,

He²,

Li³

et al. 2017

Quant. Imaging Med. Surg.

230

113

View full text Add to dashboard Cite

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“…23,24 Currently, most THz imaging applications using THz QCL sources have been demonstrated by exploiting the direct detection using slow THz detectors. [25][26][27] Actually, the ultrafast detection mechanism can be also used for imaging. In 2005, Barbieri et al successfully demonstrated inter-mode beat note imaging with THz QCLs using a fast Schottky diode mixer.…”

confidence: 99%

Terahertz imaging using photomixers based on quantum well photodetectors

Zhou

Wan

et al. 2017

AIP Advances

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Due to the fast intersubband transitions, the terahertz (THz) quantum well photodetector (QWP) is supposed to work fast. Recently it has been demonstrated that the THz QWP can detect the THz light modulated at 6.2 GHz and therefore it can be used as a photomixer [H. Li et al., Sci. Rep. 7, 3452 (2017)]. In this work, the authors report a novel active THz imaging using THz QWP photomixers. The THz radiation source used for this imaging application is a multi-mode THz quantum cascade laser (QCL) operating in continuous wave mode. When the fast THz QWP is illuminated by the multi-mode THz radiation, the intermediate frequency signal that is resulted from the frequency beating between the neighbouring THz modes of the QCL can be extracted from the QWP mesa for imaging applications. Employing the technique, the frequency can be down-converted from the THz range to the microwave regime. And therefore, the signal can then be amplified, filtered, and detected using the mature microwave technology.

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“…Two types of THz-FPAs, namely, broad-band type and narrow-band type microbolometer THz-FPAs, have been developed so far [9], [18], [19] and they have 320x240 format and 23.5 μm pixel pitch. Figure 1 shows pixel structures of both broad-band and narrow-band types.…”

Section: Microbolometer Thz Focal Plane Array (Thz-fpa)mentioning

confidence: 99%

“…Microbolometer focal plane arrays (FPAs) have recently been developed specifically for the THz frequency range by several groups [9]- [11] . NEC, the company of the first author of this paper, has begun initial production of a palm-size THz camera which operates at a 30Hz frame rate [12] .…”

Section: Introductionmentioning

confidence: 99%

Proposal for real-time terahertz imaging system with palm-size terahertz camera and compact quantum cascade laser

Oda¹,

Lee

Ishi³

et al. 2012

SPIE Proceedings

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This paper describes a real-time terahertz (THz) imaging system, using the combination of a palm-size THz camera with a compact quantum cascade laser (QCL). The THz camera contains a 320x240 microbolometer focal plane array which has nearly flat spectral response over a frequency range of ca. 1.5 to 100 THz, and operates at 30 Hz frame rate.The QCL is installed in compact cryogen-free cooler. A variety of QCLs are prepared which can cover frequency range from ca. 1.5 to 5 THz. THz images of biochemical samples will be presented, using the combined imaging system. Performance of the imaging system, such as signal-to-noise ratio of transmission-type THz microscope, is predicted.

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Uncooled bolometer-type Terahertz focal plane array and camera for real-time imaging

Cited by 130 publications

References 10 publications

Recent advances in terahertz technology for biomedical applications

Recent advances in terahertz technology for biomedical applications

Terahertz imaging using photomixers based on quantum well photodetectors

Proposal for real-time terahertz imaging system with palm-size terahertz camera and compact quantum cascade laser

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