Results 271 to 280 of about 2,335,579 (312)
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Applied Optics, 1987
The phase mask distribution of optical sine transformation (OST) has been calculated according to the optical general transformation theory. To avoid the diffraction loss of the phase mask, the optical waveguide method is used. Computation shows that the optical sine transformation is possible with only one phase mask, i.e., one-half of a cylindrical ...
G, Yang +4 more
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The phase mask distribution of optical sine transformation (OST) has been calculated according to the optical general transformation theory. To avoid the diffraction loss of the phase mask, the optical waveguide method is used. Computation shows that the optical sine transformation is possible with only one phase mask, i.e., one-half of a cylindrical ...
G, Yang +4 more
openaire +2 more sources
Optical coordinate transformations
Applied Optics, 1992A novel technique for designing holographic optical elements that can perform general types of coordinate transformation is presented. The design is based on analytic ray-tracing techniques for finding the grating vector of the element, from which the holographic grating function is obtained as a solution of a Poissonlike equation. The grating function
N, Davidson, A A, Friesem, E, Hasman
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Compact and broadband multimode waveguide bend by shape-optimizing with transformation optics
, 2020Multimode waveguide bend is one of the key components for realizing high-density mode-division multiplexing systems on chip. However, the reported multimode waveguide bends are either large, bandwidth-limited or fabrication-complicated, which hinders ...
Shuyi Li +7 more
semanticscholar +1 more source
IEEE Transactions on Antennas and Propagation, 2019
A transformation-optics mapping that radially compresses a sphere into a cylindrical slab with an arbitrary ratio of D/t is proposed to design a flat and thin dual-polarized Luneburg lens antenna (LLA) for ultrawide-angle operation at microwave bands ...
Yuanyan Su, Zhi Ning Chen
semanticscholar +1 more source
A transformation-optics mapping that radially compresses a sphere into a cylindrical slab with an arbitrary ratio of D/t is proposed to design a flat and thin dual-polarized Luneburg lens antenna (LLA) for ultrawide-angle operation at microwave bands ...
Yuanyan Su, Zhi Ning Chen
semanticscholar +1 more source
IEEE Transactions on Antennas and Propagation, 2018
Based on a transformation optics method, a flat compact dual-polarized Luneburg lens antenna is proposed and implemented using the printed-circuit-board-stacked gradient-index metamaterials for beamscanning and multibeam applications at X-bands.
Yuanyan Su, Zhi Ning Chen
semanticscholar +1 more source
Based on a transformation optics method, a flat compact dual-polarized Luneburg lens antenna is proposed and implemented using the printed-circuit-board-stacked gradient-index metamaterials for beamscanning and multibeam applications at X-bands.
Yuanyan Su, Zhi Ning Chen
semanticscholar +1 more source
Advanced synthesis of meta-antenna radiation pattern enabled by transformation optics
Journal of Optics, 2019Multi emission meta-radiating structures have been an important area of focus due to their potential applications in multi-user scenarios. Thereby, based on the concept of multi-folded transformation optics, a general approach for enabling the ...
H. B. Sedeh +2 more
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Geometrically flat hyperlens designed by transformation optics
Journal of Physics D: Applied Physics, 2019Here, we present a geometrically flat hyperlens that can still magnify and transfer sub-wavelength objects to the far-field. The flat hyperlens is designed using the transformation optics approach, which transforms the virtual space of the cylindrical ...
Sunae So, J. Rho
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Fourier-transform optical microsystems
Optics Letters, 1999The design, fabrication, and initial characterization of a miniature single-pass Fourier-transform spectrometer (FTS) that has an optical bench that measures 1 cm x 5 cm x 10 cm is presented. The FTS is predicated on the classic Michelson interferometer design with a moving mirror. Precision translation of the mirror is accomplished by microfabrication
S D, Collins +5 more
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Transformation optics and metamaterials
Nature Materials, 2010Underpinned by the advent of metamaterials, transformation optics offers great versatility for controlling electromagnetic waves to create materials with specially designed properties. Here we review the potential of transformation optics to create functionalities in which the optical properties can be designed almost at will. This approach can be used
Chen, Huanyang +2 more
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Optical nonsubsampled contourlet transform
Applied Optics, 2016The nonsubsampled contourlet transform (NSCT) is a fully shift-invariant, multiscale, and multidirectional expansion implemented in optics using the Fourier transform of its filters. In this paper, we propose a novel optical NSCT filter design method and the corresponding post-processing method to avoid the use of holographic techniques.
Liang, Han +4 more
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