A method to analyze the change in the polarization state of a terahertz (THz) wave by using a typical electro-optic sampling setup with a ?110? zinc-blende crystal as a sensor is presented. To illustrate knowledge of the polarization of the THz pulse, the THz detection function in a ZnTe crystal is presented. Two kinds of Jones matrix for the birefringence device and the polarizer device are used to analyze the polarization change in the THz electric field caused by the sample. It is found that THz polarization imaging is sensitive to the edge of the sample.
[Show abstract][Hide abstract] ABSTRACT: The recent advances involving imaging with sub-picosecond
terahertz pulses have opened up a wide range of possibilities in the
applications of far-infrared technology. For the first time, a
commercially viable terahertz imaging spectrometer seems a realizable
prospect. However, several substantial engineering research challenges
remain to be overcome before this goal can be achieved. One of these
involves the necessity for a femtosecond laser system, required for
gating the emitter and receiver antennas used in the THz-TDS system. The
demonstration experiments performed to date have employed rather crude
signal processing algorithms. The shortcomings of these are evident in
some of the results presented here, highlighting the need for a more
Nonlinear Optics '98: Materials, Fundamentals and Applications Topical Meeting; 09/1998
[Show abstract][Hide abstract] ABSTRACT: Within the last several years, the field of terahertz science and technology has changed dramatically. Many new advances in the applications of terahertz imaging have been developed. We present a pulsed terahertz real-time imaging with dynamic subtraction technique. The reflective image of a Nikon camera cap is obtained. The multiwavelength imaging and polarization imaging methods are also shown in the paper. At the end, we give the result of continous-wave (CW) standoff imaging with the imaging distance of 50m.
[Show abstract][Hide abstract] ABSTRACT: We present a terahertz wave polarization analysis method to extract the polarization rotation angle with respect to the horizontal direction. A quartz crystal is used as the polarization analyzer with the optical axis of the crystal fixed at 45 degrees orientation. The polarization angle of the terahertz waves generated from two-color laser-induced gas plasma is extracted by measuring the transmitted ordinary and extraordinary beams. This work demonstrates that low-absorbance birefringent materials are good candidates for terahertz polarization analysis.
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