Results 21 to 30 of about 2,348 (165)
Nanooptical elements for visual verification
Scientific Reports, 2021 This paper focuses on the development of flat diffractive optical elements (DOEs) for protecting banknotes, documents, plastic cards, and securities against counterfeiting.
Alexander Goncharsky +3 more
doaj +1 more source
Achromatic diffractive liquid-crystal optics for virtual reality displays
Light: Science & Applications, 2023 Diffractive liquid-crystal optics is a promising optical element for virtual reality (VR) and mixed reality as it provides an ultrathin formfactor and lightweight for human factors and ergonomics.
Zhenyi Luo +4 more
doaj +1 more source
Modern Types of Axicons: New Functions and Applications
Sensors, 2021 Axicon is a versatile optical element for forming a zero-order Bessel beam, including high-power laser radiation schemes. Nevertheless, it has drawbacks such as the produced beam’s parameters being dependent on a particular element, the output beam’s ...
Svetlana N. Khonina +3 more
doaj +1 more source
IEEE Photonics Journal, 2022 Diffractive optical element (DOE) array promises compact shape for full-parallax integral imaging three-dimensional (3D) display. However, DOEs suffer from large chromatic aberration due to the strong wavelength-dependent nature of diffraction phenomena ...
Yuedi Wang +7 more
doaj +1 more source
Two-photon imaging with diffractive optical elements [PDF]
Frontiers in Neural Circuits, 2009 Two-photon imaging has become a useful tool for optical monitoring of neural circuits, but it requires high laser power and serial scanning of each pixel in a sample. This results in slow imaging rates, limiting the measurements of fast signals such as neuronal activity. To improve the speed and signal-to-noise ratio of two-photon imaging, we introduce
Watson, Brendon O. +2 more
openaire +4 more sources
Design, fabrication and investigation of a silicon subwavelength terahertz axicon [PDF]
Компьютерная оптика, 2019 A silicon subwavelengh terahertz axicon has been designed, fabricated, and investigated by methods of numerical and optical experiments. The research has been performed on a free-electron laser workstation NOVOFEL (Budker Institute of Nuclear Physics of ...
Svetlana Khonina +6 more
doaj +1 more source
Компьютерная оптика, 2021 Spatial intensity distributions of the Laguerre-superGauss modes (1,0) as well as a super-Gaussian beam with radial and circular polarization were investigated versus changes in the height of a diffractive axicon.
D.A. Savelyev
doaj +1 more source
Cascaded diffractive optical element for high-fidelity optical information encryption [PDF]
EPJ Web of ConferencesCascaded diffractive optical element (DOE), consisting of multiple DOE layers, is a type of multi-layer architecture that introduces additional design freedom, e.g.
Li Yanqiu +3 more
doaj +1 more source
Spectral resolution of optical filters based on diffractive optical elements with non-uniform illumination [PDF]
Journal of the European Optical Society-Rapid Publications, 2008 We study the transmission coefficient and the spectral resolution of optical filters based on a diffractive optical element (DOE), with a collimating lens, input and output fibers.
Angelskår Hallvard, Sudbø Aasmund S.
doaj +1 more source
Results in PhysicsMultifocal refractive-diffractive optical elements, which produce arbitrary light distribution, are widely used in lightweight and compact optical systems.
Bo Dong, Ying Yang, Changxi Xue
doaj +1 more source