Results 31 to 40 of about 5,613 (231)
Band-specific phase engineering for curving and focusing light in waveguide arrays [PDF]
, 2012 Band specific design of curved light caustics and focusing in optical waveguide arrays is introduced. Going beyond the discrete, tight-binding model, which we examined recently, we show how the exact band structure and the associated diffraction ...
Chremmos, Ioannis +1 more
core +1 more source
IEEE Access, 2019 The spaceborne synthetic aperture radar (SAR) system working at P-band, is vulnerable to the ionospheric effect. The ionospheric scintillation will introduce random phase fluctuations into the SAR signal and deteriorate the imaging performance.
Lei Yu +4 more
doaj +1 more source
Design and control of laser micromachining workstation [PDF]
, 2012 The production process of miniature devices and microsystems requires the utilization of non-conventional micromachining techniques. In the past few decades laser micromachining has became micro-manufacturing technique of choice for many industrial and ...
Baran, Eray Abdurrahman +6 more
core +1 more source
Accelerating and abruptly-autofocusing beam waves in the Fresnel zone of antenna arrays [PDF]
, 2013 We introduce the concept of spatially accelerating (curved) beam waves in the Fresnel region of properly designed antenna arrays. These are transversely localized EM waves that propagate in free space in a diffraction-resisting manner, while at the same ...
Chremmos, Ioannis +2 more
core +1 more source
Graphics processing unit (GPU) aided wavefront-based autofocusing in microscopy
AIP Advances, 2018 Based on the wavefront sensing and propagation, the wavefront-based autofocus approach is proposed for potentially adopted in rapid autofocusing since it can precisely locate the focal plane but only requiring much fewer multi-focal image captures ...
Zhilong Jiang +4 more
doaj +1 more source
Autofocusing Algorithm for Pixel-Super-Resolved Lensfree On-Chip Microscopy
Frontiers in Physics, 2021 In recent years, lensfree on-chip microscopy has developed into a promising and powerful computational optical microscopy technique that allows for wide-field, high-throughput microscopic imaging without using any lenses.
Yumin Wu +19 more
doaj +1 more source
Abruptly autofocusing vortex beams
Optics Express, 2012 We generate abruptly autofocusing beams that produce vortices at the focus. We give explicit equations for the phase-only Fourier masks that generate these beams including explanations for controlling the focal distance and numerical aperture. We show experimental results for the focal distance, the vortex pattern and show that the diameter of the ...
Jeffrey A, Davis +2 more
openaire +2 more sources
A New Autofocusing Method Based on Brightness and Contrast for Color Cameras
Advances in Electrical and Computer Engineering, 2016 The autofocusing is one of the most important features of imaging devices. This feature directly affects the quality of the image taken by the imaging device. Currently, many studies are being performed to improve the feature of autofocusing.
SELEK, M.
doaj +1 more source
Laguerre-Gaussian Beams with an Increased Dark Area and Autofocusing
Photonics, 2022 We introduce and investigate a novel Laguerre-Gaussian (LG) beam, different from the conventional modal LG beams, which conserve the transverse intensity structure (up to scale) on propagation.
Victor V. Kotlyar +3 more
doaj +1 more source
Lightweight smart autofocusing eyeglasses
MOEMS and Miniaturized Systems XVII, 2018 More than 100 million people in the United States of America alone suffer from age-related presbyopia caused by a loss of focal accommodation of the eye crystalline lens as the lens stiffens with age. The resulting accommodative error or lag produces blurred images of objects placed at different distances.
N, Hasan +6 more
openaire +3 more sources