منابع مشابه
Ghost imaging with twisted Gaussian Schell-model beam.
Based on the classical optical coherence theory, ghost imaging with twisted Gaussian Schell-model (GSM) beams is analyzed. It is found that the twist phase of the GSM beam has strong influence on ghost imaging. As the absolute value of the twist factor increases, the ghost image disappears gradually, but its visibility increases. This phenomenon is caused by the fact that the twist phase enhanc...
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A wide range of diffractive elements have been used to evaluate the topological charge of Laguerre-Gaussian beams. Here we show theoretically and experimentally that this charge can be simply and readily measured from the interference pattern in Young’s double slit experiment. It can be evaluated from the twisting order of the interference. The results are confronted with previously published s...
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i ntroduction: the purpose of this in vitro study was to compare the canal transportation and centering ability of twisted file (tf) to that of reciproc system. methods and materials: forty noncalcified roots with mature apices, minimum length of 19 mm and an apical curvature of 15-30 degrees (according to schneider’s method), from freshly extracted mandibular and maxillary teeth, were selected...
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The transmission and reflection of a monochromatic electromagnetic wave in a twisted nematic wedge are investigated, We consider the special case where the characteristic length f of the director twist is much higher than the optical wavelength A, By using the penurbative theoretical procedure proposed by Oldano et al., we find an analytic expression for the transmitted and reflected beams at t...
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A repetitive pin-jointed, pre-twisted structure is analysed using a state variable transfer matrix technique. Within a global coordinate system the transfer matrix is periodic, but introduction of a local coordinate system rotating with nodal cross-sections results in an autonomous transfer matrix for this Floquet system. Eigenanalysis reveals four real unity eigenvalues, indicating tension–tor...
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ژورنال
عنوان ژورنال: Nature Photonics
سال: 2015
ISSN: 1749-4885,1749-4893
DOI: 10.1038/nphoton.2015.95