THz wave polarization-controlled spectroscopic imaging for anisotropic materials

Zhang, Liangliang; Zhong, Hua; Deng, Chao; Zhang, Cunlin; Zhao, Yuejin

doi:10.1016/j.optcom.2011.05.036

Cited by 12 publications

(13 citation statements)

References 22 publications

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“…We believe that the developed technology could create a tremendous impact on T-ray imaging technologies for industrial and clinical applications as well as for the T-ray polarization imaging applications [8,9,13]. Fig.…”

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confidence: 99%

T-ray topography by time-domain polarimetry

Yasumatsu

Watanabe

2012

Opt. Lett.

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We demonstrate a method for substantially improving the axial resolution of terahertz time-of-flight measurements by analyzing the time-dependent polarization direction of an elliptically polarized single-cycle terahertz electromagnetic (T-ray) pulse. We show that, at its most sensitive, the technique has an axial resolution of ∼λ/1000 (<1 μm) with a subsecond measurement time, and very clear T-ray topographic images are obtained. Such a very high axial resolution of the T-ray topography opens the way for novel industrial and biomedical applications such as fine metalworking and corneal inspection in a safe manner.

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confidence: 99%

T-ray topography by time-domain polarimetry

Yasumatsu

Watanabe

2012

Opt. Lett.

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“…Also here, the method was applicable only to samples with large birefringence leading to double pulses of the e-and o-components. The described approaches were also extended for THz polarization imaging [9,10], where texture anisotropies of SOFI (an insulation polyurethane foam material) were imaged. As no rotation of the sample is required, this method is less prone to errors due to re-alignment compared to the methods described at the beginning of the chapter.…”

Section: Determination Of the Orientation Of The Optical Axismentioning

confidence: 99%

“…With no claim to completeness, this paper should give a comprehensive view of the field of THz birefringence measurements, also providing insight into its potential for material characterization. Another wide and prosperous field is PS-THz imaging, where numerous advances have been made in the last few years (see, e.g., [4][5][6][7][8][9][10]). Although the one or other aspect will be addressed marginally in the course of this paper, PS-THz imaging is not in its main focus and is worth being reviewed elsewhere.…”

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confidence: 99%

Recent Advances in Birefringence Studies at THz Frequencies

Wiesauer

Jördens

2013

J Infrared Milli Terahz Waves

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In the last few years, various studies on terahertz (THz) birefringence have been presented, based on polarization-sensitive THz time-domain spectroscopy. The field of THz birefringence is a wide one covering several aspects, such as different materials exhibiting THz birefringence, polarization-sensitive THz technology, as well as numerous methods for extracting the birefringence properties of a sample from the THz data. Therefore, this paper aims at reviewing recent results on THz birefringence measurements presented in literature, addressing the above aspects and giving an overview of the topic. Moreover, it will focus on the investigation of birefringent fibrous samples, where specific results will be discussed in detail. Altogether, this paper should give a comprehensive view on the recent achievements in the measurements of THz birefringence.

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“…Terahertz (THz) imaging is a new hot topic in the current field of imaging technology [1][2][3][4][5]. THz imaging has the advantage to penetrate most of non-metal and non-polar materials for the detection of concealed objects, while it is harmless to biological tissue and human body [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Many variations of this scheme have been presented since then. Most of them were based on the pulsed THz time-domain spectroscopic imaging [3][4][5][6]. Pallavi Doradla et al presented some reflection measurements of 5-mm-thick sections of colorectal tissues using a polarization-specific detection technique based on continuous wave (CW) terahertz source [7].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Imaging Progress at Capital Normal University

Zhao¹

2017

IJASS

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The progress on terahertz imaging at Capital Normal University in Beijing is presented. Our works on TerahertzImaging include the active and passive imaging. For the active terahertz imaging, the pulse and continue wave terahertz imaging are studied, respectively. The active terahertz pulse imaging is based on the terahertz time-domain spectroscopy (THz-TDS). A practical focus-plane imaging system is built up based on the THz-TDS with the probe-beam-expanded electro-optical sampling and an infrared CCD imaging. The active terahertz continuous wave imaging is based on a CO 2 -laser-pumped terahertz coherent source and an uncooled bolometer array of terahertz camera. The active terahertz polarization imaging and wave front imaging is developed. For the passive terahertz imaging, the low frequency of radiometers are used to detect the point-to-point beam-scanned terahertz signal by the optical focusing and scanning system so that the passive THz imaging is realized for the security inspection of human body. The related components and image processing methods are studied and used for the improvement of imaging speed and resolution. The research on THz imaging technology at Capital Normal University is opening up a potential application in the field of non-destructive testing and security inspection for the terahertz technology.

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THz wave polarization-controlled spectroscopic imaging for anisotropic materials

Cited by 12 publications

References 22 publications

T-ray topography by time-domain polarimetry

T-ray topography by time-domain polarimetry

Recent Advances in Birefringence Studies at THz Frequencies

Terahertz Imaging Progress at Capital Normal University

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