Results 191 to 200 of about 42,760 (220)

Terahertz transition radiation

Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004., 2006
We report on the observation of transition radiation generated by short optical pulses crossing the boundary between linear and non-linear materials. Unlike transition radiation observed with moving charges, we observe terahertz generation at the boundary between two media traversed by a femtosecond optical pulses.
A.S. Nikoghosyan, E.M. Laziev, R.M. Martirosyan, A.A. Hakhoumian, J.M. Chamberlain, R.A. Dudley, N.N. Zinov'ev   +6 more
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Imaging with terahertz radiation

Reports on Progress in Physics, 2007
Within the last several years, the field of terahertz science and technology has changed dramatically. Many new advances in the technology for generation, manipulation, and detection of terahertz radiation have revolutionized the field. Much of this interest has been inspired by the promise of valuable new applications for terahertz imaging and sensing.
Chan, Wai Lam, Deibel, Jason A., Mittleman, Daniel M.   +2 more
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Quadrupole radiation from terahertz dipole antennas

Optics Letters, 2000
We report what is to our knowledge the first detailed investigation of the polarization state of radiation from lens-coupled terahertz dipole antennas. The radiation exhibits a weak but measurable component that is polarized orthogonally to the orientation of the emitter dipole.
J V, Rudd, J L, Johnson, D M, Mittleman
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Langmuir wave undulator for terahertz radiation

Optics Letters, 2012
A source of terhertz (THz) radiation based on the free-electron laser, where a plasma wave plays the role of undulator, is theoretically studied. This scheme can generate coherent photons in the range of 0.1-10 THz. The feasible physical parameters in laboratories are estimated.
Seunghyeon, Son, Sung Joon, Moon, Jaeyoung, Park   +2 more
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Imprinted diffractive optics for terahertz radiation

Optics Letters, 2007
Terahertz diffractive optic elements have been fabricated in polypropylene by imprinting with a silicon master. A silicon master is created with eight phase levels for high diffraction efficiency and etched using inductively coupled plasma reactive ion etching.
E D, Walsby, J, Alton, C, Worrall, H E, Beere, D A, Ritchie, D R S, Cumming   +5 more
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Terahertz radiation and spectroscopy

OSA Annual Meeting, 1993
Various mechanisms for generating short pulses of terahertz radiation by excitation with ultrafast laser pulses are described, together with optoelectronic and bolometric means of terahertz detection.
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Terahertz radiation probes polymers

C&EN Global Enterprise, 2016
For a long time, the club of scientists working with terahertz radiation was fairly exclusive. Its “members” included instrumentation aficionados who made customized equipment for probing molecules in the terahertz range (1 THz = 1012 Hz), also known as the far-infrared range. These scientists used light in this portion of the electromagnetic spectrum,
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Noninvasive Mail Inspection System with Terahertz Radiation

Applied Spectroscopy, 2009
Using the high penetrability of the terahertz waves and the characteristic absorption spectra in this frequency range, we have built a noninvasive mail inspection system targeting drugs and explosives. The system is composed of two stages; in the first stage, the scattering of a continuous terahertz wave is used for selecting mail that contains ...
Hiromichi, Hoshina, Yoshiaki, Sasaki, Aya, Hayashi, Chiko, Otani, Kodo, Kawase   +4 more
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Emission of Terahertz Radiation

2003
As described by the theory set out in Chap. 1 and proven by the experiments discussed in Chap. 4, Bloch oscillations are associated with a harmonic spatial motion of carriers. It is obvious that these carriers should thus generate radiation owing to their continuous acceleration.
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Sensing with Terahertz Radiation

2003
Spectroscopy in the Terahertz Spectral Region.- Terahertz Imaging.- Free-Space Electro-Optic Techniques.- Photomixers for Continuous-Wave Terahertz Radiation.- Applications of Optically Generated Terahertz Pulses to Time Domain Ranging and Scattering.- Bio-medical Applications of THz Imaging.- Electronic Sources and Detectors for Wideband Sensing in ...
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