Two-dimensional electro-optic imaging of THz beams

Wu, Qi; Hewitt, T. D.; Zhang, X.‐C.

doi:10.1063/1.116920

Cited by 412 publications

(186 citation statements)

References 0 publications

Supporting

Mentioning

182

Contrasting

Unclassified

Order By: Relevance

“…This technique is quite time consuming; a typical image of size 100 × 100 pixels measured at 18 projection angles can take over an hour. The imaging speed may be dramatically improved to under a few minutes using 2D THz imaging with a CCD camera (Wu et al 1996), however, the diffracted THz radiation then becomes significant and introduces additional processing concerns.…”

Section: T-ray Computed Tomographymentioning

confidence: 99%

See 1 more Smart Citation

Towards functional 3D T-ray imaging

et al. 2002

View full text Add to dashboard Cite

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.

show abstract

Section: T-ray Computed Tomographymentioning

confidence: 99%

“…A number of alternative methods have been suggested. A dramatic improvement in acquisition speed was made using two-dimensional electro-optic detection of a collimated THz pulse (Wu et al 1996).…”

Section: T-ray Imaging With a Chirped Probe Beammentioning

confidence: 99%

Towards functional 3D T-ray imaging

et al. 2002

View full text Add to dashboard Cite

show abstract

“…Shortly afterwards a dramatic improvement in acquisition speed was made using two-dimensional electro-optic detection of the terahertz pulse [21]. In this technique, the terahertz pulse acts as a transient bias on a k110l oriented ZnTe crystal, inducing a polarisation in the crystal.…”

Section: Thz Imagingmentioning

confidence: 99%

“…2. Hardware schematic for all-optical 2D THz imaging [21]. The image is formed by expanding the THz and probe beams and using the Pockel's effect and crossed polarisers to convert the THz field to an intensity modulation which is measured using the CCD.…”

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

View full text Add to dashboard Cite

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

show abstract

“…Very recently, several attempts have been made to improve the lateral resolution by applying near-field techniques such as using small apertures in front of the sample 102 or terahertz pulse generation in subwavelength regions. 99 It was shown recently 103 that electrooptic sampling can be performed in parallel using a large-area electrooptic crystal and an unfocused probe beam, thus allowing the acquisition of t-ray images in real time.…”

Section: Imagingmentioning

confidence: 99%

Ultrafast Laser Technology and Spectroscopy

Reid

Wynne

2000

Encyclopedia of Analytical Chemistry

View full text Add to dashboard Cite

Ultrafast laser technology and spectroscopy involves the use of femtosecond (10 −15 s) laser and other (particle) sources to study the properties of matter. The extremely short pulse duration allows one to create, detect and study very short‐lived transient chemical reaction intermediates and transition states. Ultrafast lasers can also be used to produce laser pulses with enormous peak powers and power densities. This leads to applications such as laser machining and ablation, generation of electromagnetic radiation at unusual wavelengths (such as millimeter waves and X‐rays), and multiphoton imaging. The difficulty in applying femtosecond laser pulses is that the broad frequency spectrum can lead to temporal broadening of the pulse on propagation through the experimental set‐up. In this article, we describe the generation and amplification of femtosecond laser pulses and the various techniques that have been developed to characterize and manipulate the pulses.

show abstract

Two-dimensional electro-optic imaging of THz beams

Cited by 412 publications

References 0 publications

Towards functional 3D T-ray imaging

Towards functional 3D T-ray imaging

Identification of biological tissue using chirped probe THz imaging

Ultrafast Laser Technology and Spectroscopy

Contact Info

Product

Resources

About