Results 341 to 350 of about 7,907,205 (365)
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Extending focus of optical microscopy and application
SPIE Proceedings, 2003With the development of modern science and techology, MEMS becomes an important branch. The micro operating system becomes an interested spot. During the micromanipulation process, observing the micro components by optical microscope is a crucial technology. Limited by the optical parameters, focus of the optical microscope is small.
Rei Li +4 more
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Depth of focus enhancement in optical lithography
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena, 1992Apodization, or pupil plane filtering, can be used to enhance the depth of focus of lithographic projection systems. However, this improvement comes at the expense of decreasing radial concentration of energy in the point spread function. To examine this tradeoff quantitatively, we first define the average encircled energy as a criterion of the energy ...
R. von Bünau +2 more
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The Sub‐Nanometer Scale as a New Focus in Nanoscience
Advances in Materials, 2018Size is one of the central issues in nanoscience. The practical meaning of the term “sub‐nanometric material (SNM)” requires two aspects: (1) its size should be at the atomic level; (2) it shows unique (size‐related) properties compared to its nano ...
Bing Ni, Yuang Shi, Xun Wang
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Analysis on the depth of focus in flying optics
Optical Engineering, 1998Based on a simplified model of Gaussian beam focusing, in which nontruncating, thin-lens, aberration-free, and on-axis optical sys- tems are assumed and the thermal-lensing effect is neglected, a general and concise expression is derived to describe the variation of 1/e 2 radius of the focused beam as a function of input beam waist to lens spacing ...
Chih-Han Fang, Mao-Hong Lu
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The Focus of Beam Using Optical Transformation
Advanced Materials Research, 2013A novel scheme is proposed to achieve beam focus by applying the method of embedded coordinate transformation[1] in this paper. The focus degree of electromagnetic waves is determined by the structure parameters in the transformation region. Theoretical analysis and simulating results are given to demonstrate that our design is feasible and practical ...
G.X. Yu, Lijuan Xia, Xin Ye Yu
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Focus wave modes in optical parametric generators
Optics Letters, 2002It is shown that in the paraxial approximation the conditions for noncollinear phase matching for three-wave parametric interaction in a nonlinear crystal coincide with the conditions for generation of focus wave modes. As a result, the creation of broadband localized optical fields (pulsed beams without diffraction and dispersion spreading) inside the
A. Stabinis, A. Piskarskas, S. Orlov
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Sampling for Shape from Focus in Optical Microscopy
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2012Shape from focus (SFF), which relies on image focus as a cue within sequenced images, represents a passive technique in recovering object shapes in scenes. Although numerous methods have been recently proposed, less attention has been paid to particular factors affecting them.
Mannan Saeed Muhammad, Tae-Sun Choi
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Measurement of localized heating in the focus of an optical trap
Applied Optics, 2000Localized heating in the focus of an optical trap operating in water can result in a temperature rise of several kelvins. We present spatially resolved measurements of the refractive-index distribution induced by the localized heating produced in an optical trap and infer the temperature distribution. We have determined a peak temperature rise in water
Jérôme Conia, Peter M. Celliers
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Plasmonic Metasurfaces for Nonlinear Optics and Quantitative SERS
, 2016Plasmonic metasurfaces consist of two-dimensional arrays of metallic nanoresonators (plasmonic “meta-atoms”), which exhibit collective and tunable resonance properties controlled by electromagnetic near-field coupling. These man-made surfaces can produce
S. Gwo +8 more
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Ultra-high-speed variable focus optics for novel applications in advanced imaging
OPTO, 2018S. Kang +4 more
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