Time-reversal therahertz imaging

Autor: Ruffin, A. Boh, Van Rudd, John, Decker, Joan, Sanchez-Palencia, Laurent, Le Hors, Lenaic, Whitaker, John, Norris, Theodore
Přispěvatelé: Sanchez-Palencia, Laurent, Center for Ultrafast Optical Sciences (CUOS), University of Michigan [Ann Arbor], University of Michigan System-University of Michigan System, Picometrix, Inc.
Jazyk: angličtina
Rok vydání: 2002
Předmět:
Zdroj: IEEE Journal of Quantum Electronics
IEEE Journal of Quantum Electronics, Institute of Electrical and Electronics Engineers, 2002, 38, pp.1110
ISSN: 0018-9197
Popis: We describe a technique for imaging in the terahertz regime using time reversal of single-cycle pulses. Specifically, the time-reversal symmetry of Maxwell's wave equation is exploited to reconstruct the transmission function of a diffracting aperture by inverting the diffracted fields. After deriving a time-reversed form of the Huygens-Fresnel diffraction integral, we demonstrate through simulation and experiment the reconstruction of one-dimensional and two-dimensional (2-D) objects. A means to obtain data efficiently for reconstruction of 2-D apertures is described. The spatial resolution determined by the Sparrow criterion is found to correspond to approximately 30% of the peak wavelength and 85% of the mean wavelength of the power spectrum of the single-cycle waveform. Finally, the modulation transfer function for the imaging method is simulated and is shown to be nearly diffraction-limited when compared to an ideal imaging system.
Databáze: OpenAIRE
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