Results 251 to 260 of about 1,925,346 (295)

An affordable fiducial marker strategy for reliable autofocus in long-term live microscopy. [PDF]

J Microsc
Djafer-Cherif I, Waclaw B.
europepmc   +1 more source

Achieving Achromatic and Misalignment-Tolerant Fiber Coupling via Meta-Lens with Structural Interleaving. [PDF]

Nanomaterials (Basel)
Yuan X, Tian Z, Jia B, Zhang Y, Zhou Y, Hu C, Xu Q, Yun F.   +7 more
europepmc   +1 more source

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Acoustic metalens with switchable and sharp focusing

Applied Physics Express, 2023
Abstract Sharp and tunable focusing functionality is highly desired in various acoustic application fields. Here, we propose a simply structured metalens for water-borne sounds with a switchable focusing functionality. Each meta-atom in the lens is composed of two elliptical iron cylinders, and is smartly designed so that it can redirect
Jun Mei
exaly   +2 more sources

Analysis of polarisation states at sharp focusing

Optik, 2016
Abstract We investigate the inter-relation of the phase and polarisation singularities in systems with high numerical aperture. We consider sharp focusing by means of three types of systems: a micro-objective, a diffractive axicon and a micro-objective combined with an axicon-type multichannel diffractive optical element.
Svetlana Khonina, Dmitry Savelyev
exaly   +2 more sources

Polarization conversion at sharp focusing of vector vortex beams

2017 19th International Conference on Transparent Optical Networks (ICTON), 2017
We demonstrate the conversion of cylindrically polarized laser beams in an orthogonal polarization state by introducing a high-order vortex phase singularity. Our theoretical and experimental investigations show that increasing the order of the phase singularity leads to effective generation of azimuthal polarization from radial polarization.
Svetlana Khonina, Dmitry Savelyev
exaly   +3 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

Sharp focusing of vector optical vortices using a metalens

Journal of Optics (United Kingdom), 2018
Abstract 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 ...
Anton Nalimov, Víctor Kotlyar
exaly   +2 more sources