Imaging with terahertz waves

Hu, Bin; Nuss, M. C.

doi:10.1364/ol.20.001716

Cited by 1,490 publications

(633 citation statements)

References 8 publications

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“…Terahertz imaging was first proposed by Hu and Nuss in 1995 [20]. They used optically gated photoconductive antennas for the generation and detection of terahertz pulses.…”

Section: Thz Imagingmentioning

confidence: 99%

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Identification of biological tissue using chirped probe THz imaging

Ferguson

Wang

Gray

et al. 2002

Microelectronics Journal

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We consider the application of pulsed THz imaging systems in biomedical diagnostics and mail/packaging inspection. The sub-millimetre spectroscopic measurements obtained from T-ray systems contain a wealth of information about the sample under test. We demonstrate that different types of tissue can be classified based on their terahertz response measured with the chirped probe pulse technique. We demonstrate the performance of a quadratic classifier using linear filter models for feature extraction in the discrimination between different tissues.Modern THz systems are hindered by the slow acquisition speed. The chirped probe pulse technique offers a significant improvement in this context. We present the terahertz responses of biological samples measured using a chirped probe pulse, and discuss the problem of data processing and extracting sample characteristics. q

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“…Terahertz imaging was first proposed by Hu and Nuss in 1995 [20]. They used optically gated photoconductive antennas for the generation and detection of terahertz pulses.…”

Section: Thz Imagingmentioning

confidence: 99%

“…The spatial signal output from the spectrometer is [20]. The image is formed by scanning the mechanical motion stages in x, y and time dimensions.…”

Section: Thz Imaging With a Chirped Probe Pulsementioning

confidence: 99%

Identification of biological tissue using chirped probe THz imaging

Ferguson

Wang

Gray

et al. 2002

Microelectronics Journal

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“…During the last decade, a large research effort has been dedicated to the development of sub-millimeter wave technology (300 GHz-3 THz), due to the large number of potential applications in different areas, such as terahertz imaging and sensing [1][2][3][4][5][6][7][8][9][10][11], wireless communications [12], radio-astronomy [13], fast measurement systems [14], non-destructive material analysis [15][16][17][18], or non-ionizing diagnosis [19][20][21][22], among others.…”

Section: Introductionmentioning

confidence: 99%

SUB-MILLIMETER WAVE FREQUENCY SCANNING 8 x 1 ANTENNA ARRAY

Camblor-Diaz¹,

Hoeye²,

Vázquez³

et al. 2012

PIER

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Abstract-In this work, a sub-millimeter wave frequency scanning 8 × 1 element antenna array is presented for its use in a terahertz imaging system operating in the 220-330 GHz frequency band. The antenna array is formed by eight open ended waveguides, a phaseshifting network implemented with WR-3 rectangular waveguides and a power divider. Dielectric rods are used to improve the radiation patterns at large beam-steering angles. Prototypes of antenna arrays with and without the dielectric rods have been manufactured and experimentally characterized. A beam-steering range greater than 40 • has been obtained for a frequency sweep between 270 GHz and 330 GHz.

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“…Pulsed terahertz (THz) imaging was first proposed by Hu andNuss in 1995 (Hu andNuss 1995). It utilizes the THz, or far-infrared, region of the electromagnetic spectrum and is based upon the technique of terahertz time-domain spectroscopy (THz-TDS).…”

Section: Introductionmentioning

confidence: 99%

Towards functional 3D T-ray imaging

et al. 2002

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We review the recent development of T-ray computed tomography, a terahertz imaging technique that allows the reconstruction of the three-dimensional refractive index profile of weakly scattering objects. Terahertz pulse imaging is used to obtain images of the target at multiple projection angles and the filtered backprojection algorithm enables the reconstruction of the object's frequencydependent refractive index. The application of this technique to a biological bone sample and a plastic test structure is demonstrated. The structure of each target is accurately resolved and the frequency-dependent refractive index is determined. The frequency-dependent information may potentially be used to extract functional information from the target, to uniquely identify different materials or to diagnose medical conditions.

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Imaging with terahertz waves

Cited by 1,490 publications

References 8 publications

Identification of biological tissue using chirped probe THz imaging

Identification of biological tissue using chirped probe THz imaging

SUB-MILLIMETER WAVE FREQUENCY SCANNING 8 x 1 ANTENNA ARRAY

Towards functional 3D T-ray imaging

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