Results 261 to 270 of about 86,685 (296)

Sharp focusing by means of binary relief at the end of the optical fiber

Proceedings of SPIE, 2014
Sharp focusing of homogeneously polarized fiber modes using the binary micro-relief at the output end of the optical fiber is numerically investigated by the FDTD method. The features of the application of sharp focusing for the input of laser modes in the fiber with a smaller diameter are defined.
Dmitry Savelyev, Svetlana N Khonina
exaly   +2 more sources

Sharp-focusing Schlieren systems for studies of flat flames

Journal of Scientific Instruments, 1962
The application of sharp-focusing Schlieren systems, of the type first described by Kantrowitz and Trimpi (1950), to flat disks of non-luminous flames is discussed with the object of measuring details of the flame contour across a given plane. Such details may include local effects of introducing small probes into the flame, or the measurement of small
G Dixon-Lewis
exaly   +2 more sources

High-throughput, single-stream microparticle focusing using a microchannel with asymmetric sharp corners

Microfluidics and Nanofluidics, 2014
A new microfluidic device for fast and high-throughput particle focusing is reported. The particle focusing is based on the combination of inertial lift force effect and centrifugal force effect generated in a microchannel with a series of repeated ...
Liang-Liang Fan, Yu Han, Jiang Zhe
exaly   +2 more sources

A sharp-focusing schlieren optical deflectometer

31st Aerospace Sciences Meeting, 1993
A new instrument capable of localized, nonintrusive turbulence measurements is developed by combining a focusing schlieren system with an optical deflectometer. This instrument records the fluctuating light intensity at a point in the focused schlieren image.
F. ALVI, G. SETTLES, L. WEINSTEIN
openaire   +1 more source

Sector Metalens for Sharp Focusing of Laser Light

2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring), 2019
In this paper we have investigated a 16-sector metalens fabricated in a thin film of amorphous silicon and consisting from a set of subwavelength binary diffractive gratings. The metalens converts linearly polarized incident light into an azimuthally polarized optical vortex and focuses it. Experimentally using scanning near-field optical microscope it
S. S. Stafeev, A. G. Nalimov, L. O'Faolain, V. V. Kotlyar   +3 more
openaire   +1 more source

Inertial focusing of particles and cells in the microfluidic labyrinth device: Role of sharp turns

Biomicrofluidics, 2022
Inertial, size-based focusing was investigated in the microfluidic labyrinth device consisting of several U-shaped turns along with circular loops. Turns are associated with tight curvature and, therefore, induce strong Dean forces for separating particles; however, systematic studies exploring this possibility do not exist.
Anirudh Gangadhar, Siva A. Vanapalli
openaire   +2 more sources

Sharp focusing of vector optical vortices using a metalens

Journal of Optics, 2018
Using an FDTD-simulation, we numerically show that a spiral metalens with topological charge m = 1, numerical aperture 1, and a focal length equal to the incident wavelength produces a tight near-surface focal spot shaped as a circle for incident TE-waves or a doughnut for TM-waves.
V V Kotlyar, A G Nalimov
openaire   +1 more source

Sharp focusing of laser light by multilayer cylinders with circular cross-section

Saratov Fall Meeting 2017: Laser Physics and Photonics XVIII; and Computational Biophysics and Analysis of Biomedical Data IV, 2018
E S Kozlova
exaly   +2 more sources

Extraction and transport of sharp focused electron beam

Czechoslovak Journal of Physics, 2006
The characteristics of the electron beam extracted from plasma sources based on hollow cathode were investigated by using computer code Kobra3-INP. It has been used to evaluate the extraction and acceleration systems in attempt to generate an electron beam with high current, high brightness and low divergence.
openaire   +1 more source

Sharp focusing of laser beams in anisotropic uniaxial crystals

Journal of Optical Technology, 2015
This paper discusses the sharp focusing of homogeneously polarized laser beams in a uniaxial crystal. It is shown analytically and numerically that, when homogeneously polarized radiation is sharply focused along the axis of a crystal, two foci are formed, corresponding to the ordinary and extraordinary rays. The introduction of a vortex phase into the
S. N. Khonina, S. I. Kharitonov, O. V. Zoteeva   +2 more
openaire   +1 more source