Results 21 to 30 of about 1,925,346 (295)

Broadband and high-numerical-aperture sharp focusing for waterborne sound with metagrating-based lens

New Journal of Physics, 2022
Metalens with broadband and high-efficiency focusing functionality is desired in various underwater acoustic applications such as sonar and oceanography.
Jun Mei, Lijuan Fan, Xiaobin Hong
doaj   +1 more source

Spatial-energy characteristics of focused modes of a metal terahertz laser resonator [PDF]

Радиофизика и электроника, 2019
Subject and ppurpose. In this paper, the spatial-energy characteristics of laser beams with inhomogeneous spatial polarization with their moderate and sharp focusing are theoretically investigated.
S.A. Vlasenko, A.V. Degtyarev, M.M. Dubinin, V.A. Maslov   +3 more
doaj   +1 more source

The Effect of the Position Determination Error for Flexible Linear Array Elements on the Tomogram Focusing

Sensors, 2023
In the article, the study of the quality of tomogram focusing during the inspection of objects with curved surfaces by flexible acoustic array was described.
Dmitry A. Sednev, Alexey I. Soldatov, Andrey A. Soldatov, Maria A. Kostina, Daria A. Koneva   +4 more
doaj   +1 more source

Light distribution in fat cell layers at physiological temperatures

Scientific Reports, 2023
Adipose tissue (AT) optical properties for physiological temperatures and in vivo conditions are still insufficiently studied. The AT is composed mainly of packed cells close to spherical shape.
Irina Yu. Yanina, Polina A. Dyachenko, Arkady S. Abdurashitov, Alexander S. Shalin, Igor V. Minin, Oleg V. Minin, Andrey D. Bulygin, Denis A. Vrazhnov, Yury V. Kistenev, Valery V. Tuchin   +9 more
doaj   +1 more source

CONTROL OVER HIGHER-ORDER TRANSVERSE MODES IN A WAVEGUIDE-BASED QUASI-OPTICAL RESONATOR [PDF]

Radio Physics and Radio Astronomy, 2022
Subject and Purpose. The problems under consideration concern selection and focusing of higher-order modes in a waveguide-based dielectric laser. The purpose is to clarify the physics underlying the behavior of, and permitting control over, continuous ...
A. V. Degtyarеv, M. M. Dubinin, O. V. Gurin, V. O. Maslov, K. I. Muntean, V. M. Ryabykh, V. S. Senyuta, O. O. Svystunov   +7 more
doaj   +1 more source

Visualization Characteristics of a Sharp Focusing Schlieren Method.

Journal of the Visualization Society of Japan, 2000
A sharp focusing schlieren system gives a means for observing any cross section of a flow field, which is perpendicular to the test beam axis of the optical system. This is impossible for a conventional schlieren system. In this study, a sharp focusing schlieren system was designed with referring to the Weinsten's system to investigate visualization ...
YAMAGUCHI, Yutaka, KASHITANI, Masashi, WADA, Shinichi, SAITO, Teruo   +3 more
openaire   +2 more sources

Congeneric predators fill discrete niches created by the relative abundances of their prey species

Journal of Avian Biology, 2022
To what degree is niche partitioning driven by underlying patterns in resources such as food, rather than by competition itself? Do discrete niches exist?
Eliot T. Miller, Oisin Mac Aodha, Emma I. Greig, David N. Bonter, Wesley M. Hochachka   +4 more
doaj   +1 more source

Structurally Stable Astigmatic Vortex Beams with Super-High Orbital Angular Momentum (ABCD Matrix Approach)

Photonics, 2023
We have demonstrated efficiency of employing the ABCD matrix approach to transform higher-order structured Laguerre–Gaussian (sLG) beams into structurally stable astigmatic sLG (asLG) beams, highlighting their dynamics at propagating.
Alexander Volyar, Mikhail Bretsko, Server Khalilov, Yana Akimova   +3 more
doaj   +1 more source

Adiabatic nano-focusing of plasmons by sharp metallic wedges [PDF]

Applied Physics B, 2006
In this paper, we demonstrate the possibility of efficient adiabatic nano-focusing of plasmons by a sharp triangular metal wedge. The geometrical optics approach and the approximation of continuous electrodynamics are used for the analysis. In particular, it is demonstrated that both the phase and group velocities of an incident anti-symmetric (with ...
Gramotnev, Dmitri, Vernon, Kristy
openaire   +2 more sources

Adiabatic nano-focusing of plasmons by sharp metallic grooves: Geometrical optics approach [PDF]

, 2005
In this paper, we demonstrate the possibility of efficient adiabatic nano-focusing of gap plasmons by sharp metallic V-grooves or dielectric wedges covered with metal.
Gramotnev, Dmitri K., D. K. Gramotnev
core   +1 more source