All–optoelectronic continuous–wave terahertz systems

Löffler, Thomas; Siebert, Karsten; Quast, Holger; Hasegawa, Noburu; Loata, G.; Wipf, Robert; Hahn, Tobias; Thomson, Mark D.; Leonhardt, R.; Roskos, Hartmut G.

doi:10.1098/rsta.2003.1326

Cited by 18 publications

(4 citation statements)

References 50 publications

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“…Importantly, Hasegawa et al 43 have shown that when scanning surfaces with T-rays, they can achieve a high sensitivity to defects despite natural surface roughness. 44 This is a key finding, as it demonstrates that THz radiation outperforms visible light, which is scattered significantly by rough surfaces.…”

Section: Industrial Surface Inspection Quality Control and Process Momentioning

confidence: 84%

T-ray sensing applications: review of global developments

Rainsford

Mickan

Abbott

2005

Smart Structures, Devices, and Systems II

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Terahertz wavelengths can pass through dry, non-polar, non-metallic materials that are opaque at visible wavelengths. Moreover they can be manipulated using millimeter wave and quasi-optical techniques to form an image. Sensing in this band potentially provides advantages in a number of areas of interest for security and defense, such as screening of personnel for hidden objects, and the detection of chemical and biological agents. This paper reviews recent research into THz applications by groups across Europe, the US, Australasia, and the UK. Several private companies are developing smaller and cheaper reliable devices allowing for commercialisation of these applications. While there are a number of challenges to be overcome there is little doubt that THz technologies will play a major role in the near future for advancement of security, public health and defense.

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Section: Industrial Surface Inspection Quality Control and Process Momentioning

confidence: 84%

T-ray sensing applications: review of global developments

Rainsford

Mickan

Abbott

2005

Smart Structures, Devices, and Systems II

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“…20 The technology for growth, design, and characterization of the Low Temperature Grown (LT) GaAs photomixers has improved dramatically 20,21 enabling the use of CW THz systems for sensing, spectroscopy, 22,23 and imaging applications. 24,25,26,27,28 The key materials component of LT-GaAs and higher power ErAs:GaAs photomixers is the presence of nanoparticulates that reduce the charge carrier lifetime in the material to the sub-picosecond level thereby enabling optical mixing to the THz range. While there has been improvements in photomixer performance with ErAs:GaAs materials, 29 the photomixer approach has been limited by the achievable output power and device reliability.…”

Section: Thz Photomixing Systemmentioning

confidence: 99%

Terahertz imaging using an interferometric array

et al. 2005

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It has been suggested that interferometric/ synthetic aperture imaging techniques, when applied to the THz regime, can provide sufficient imaging resolution and spectral content to detect concealed explosives and other weapons from a standoff distance. The interferometric imaging method is demonstrated using CW THz generation and detection. Using this hardware, the reconstruction of THz images from a point source is emphasized and compared to theoretical predictions.

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“…22 The technology for growth, design, and characterization of the Low Temperature Grown (LT) GaAs photomixers has improved dramatically 22,23 enabling the use of CW THz systems for sensing, spectroscopy, 15,24 and imaging applications. 25,26,27,28,29 The key materials component of LT-GaAs and higher power ErAs:GaAs photomixers is the presence of nanoparticulates that reduce the charge carrier lifetime in the material to the sub-picosecond level thereby enabling optical mixing to the THz range. While there has been improvements in photomixer performance with ErAs:GaAs materials, 30 the photomixer approach has been limited by the achievable output power and device reliability.…”

Section: Options For Imaging Modalitiesmentioning

confidence: 99%

<title>THz standoff detection and imaging of explosives and weapons (Invited Paper)</title>

et al. 2005

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Recently, there has been a significant interest in employing Terahertz (THz) technology, spectroscopy and imaging for standoff detection applications. There are three prime motivations for this interest: (a) THz radiation can detect concealed weapons since many non-metallic, non-polar materials are transparent to THz radiation, (b) target compounds such as explosives, and bio/chemical weapons have characteristic THz spectra that can be used to identify these compounds and (c) THz radiation poses no health risk for scanning of people. This paper will provide an overview of THz standoff detection of explosives and weapons including discussions of effective range, spatial resolution, and other limitations. The THz approach will be compared to alternative detection modalities such as x-ray and millimeter wave imaging.

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All–optoelectronic continuous–wave terahertz systems

Cited by 18 publications

References 50 publications

T-ray sensing applications: review of global developments

T-ray sensing applications: review of global developments

Terahertz imaging using an interferometric array

<title>THz standoff detection and imaging of explosives and weapons (Invited Paper)</title>

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