Results 211 to 220 of about 78,093 (245)

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, Lijuan Fan, Xiaobin Hong
openaire   +1 more source

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

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 Nikolaevna Khonina   +2 more
openaire   +1 more source

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