منابع مشابه
Near-field diffraction of chirped gratings.
In this Letter, we analyze the near-field diffraction pattern produced by chirped gratings. An intuitive analytical interpretation of the generated diffraction orders is proposed. Several interesting properties of the near-field diffraction pattern can be determined, such as the period of the fringes and its visibility. Diffraction orders present different widths and also, some of them present ...
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A phase-step in a phase mask is not copied into the substrate but is split into two half-amplitude phase-shifts in the near-field because of the presence of an additional interference fringe system of the two beams diffracted from the two grating sections separated by the phase-step. In the case of multiple phase-shifts, the split phase-shifts from two adjacent phase-steps can crossover in the ...
متن کاملChirped Gratings in Integrated Optics
Gratings with variable periods (chirped gratings) have been fabricated by recording the interference pattern of a collimated laser beam with a converging beam generated by a cylindrical lens. An analysis is presented for the behavior of the chirped gratings as a function of wavelength, the angle between the illuminating beams, the F number of the lens, and its position. To calculate the power r...
متن کاملNear-field studies of arrays of chirped subwavelength apertures
1 Nonlinear Physics Center, Research School of Physics and Engineering, The Australian National University, Canberra, ACT, Australia 2 WITec GmbH, Lise-Meitner-Straße 6, 89081 Ulm, Germany 3 School of Information Technology and Electrical Engineering, University of New South Wales, The Australian Defence Force Academy, Canberra, ACT, Australia 4 Department of Electronic Materials Engineering, R...
متن کاملPoled polymer thin-film gratings studied with far-field optical diffraction and second-harmonic near-field microscopy.
Electrical poling induces polar ordering of molecules in a grating that has been holographically inscribed on a thin film of polymer with azobenzene side chains. The resulting chi2 grating, seen by second-harmonic-generation (SHG) near-field scanning optical microscopy, can have a periodic structure that is significantly different from the topographical image. The far-field linear and SHG diffr...
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ژورنال
عنوان ژورنال: Optics Letters
سال: 2016
ISSN: 0146-9592,1539-4794
DOI: 10.1364/ol.41.004091