Results 51 to 60 of about 32,036 (281)
Diffractive X-ray Telescopes [PDF]
, 2010 Diffractive X-ray telescopes using zone plates, phase Fresnel lenses, or related optical elements have the potential to provide astronomers with true imaging capability with resolution several orders of magnitude better than available in any other ...
Skinner, Gerald K.
core +3 more sources
Advanced Materials, EarlyView.We introduce a molecular strategy to assemble one‐dimensional (1D) materials into two‐dimensional (2D) van der Waals metal–organic frameworks (MOFs). Crystals of [FeX(pzX)(bpy)] (X = Cl, F) form anisotropic 2D layers that can be mechanically exfoliated into thin sheets.
Eleni C. Mazarakioti +12 more
wiley +1 more source
Double-sided split-step MM-wave Fresnel lenses: design, fabrication and focal field measurements [PDF]
Journal of the European Optical Society-Rapid Publications, 2014 Design, fabrication and focal field measurements of W-band Fresnel lenses to produce well-shaped Gaussian beams in the focal domain are presented. Two lenses, one of Teflon and another of Polyamide, have been compared in their performance with a double ...
Yurchenko V. B. +4 more
doaj +1 more source
A Transmittance-optimized, Point-focus Fresnel Lens Solar Concentrator [PDF]
, 1984 The development of a point-focus Fresnel lens solar concentrator for high-temperature solar thermal energy system applications is discussed. The concentrator utilizes a transmittance-optimized, short-focal-length, dome-shaped refractive Fresnel lens as ...
Oneill, M. J.
core +1 more source
Advanced Science, EarlyView.A programmable 2048‐element circular ultrasound array combined with a compact acoustic lens produces a thin “sound sheet” over a large field of view, and records echoes with wide angular diversity across the ring aperture. Coherence‐enhanced beamforming converts full‐matrix data into high‐contrast tomographic slices, delivering near‐diffraction‐limited
Qiu‐De Zhang +11 more
wiley +1 more source
Hybrid high-concentration photovoltaic system designed for different weather conditions
Scientific Reports, 2023 In this study, we propose a novel high-concentration photovoltaic (HCPV) cell by considering both the light leakage characteristics of the Fresnel-lens-based solar cell modules and the performance issues arising from cloud shading in practical use.
Chi Sun +6 more
doaj +1 more source
Development of Ground-testable Phase Fresnel Lenses in Silicon
, 2006 Diffractive/refractive optics, such as Phase Fresnel Lenses (PFL's), offer the potential to achieve excellent imaging performance in the x-ray and gamma-ray photon regimes.
B. Morgan +14 more
core +1 more source
Generalised photon sieves: fine control of complex fields with simple pinhole arrays [PDF]
, 2015 Spatial shaping of light beams has led to numerous new applications in fields such as imaging, optical communication, and micromanipulation. However, structured radiation is less well explored beyond visible optics, where methods for shaping fields are ...
Li, F. +3 more
core +1 more source
Advanced Science, EarlyView.A large‐aperture, high focusing efficiency and polarization‐independent THz single‐layer achromatic metalens is reported via discrete multi‐wavelength achromatic design and global optimization algorithm. The fabricated metalens exhibits a largest diameter of 2.21 cm, excellent achromatic performance, extremely high average focusing efficiency (> 46 ...
Xiaoqiang Jiang +7 more
wiley +1 more source
Journal of Sustainable Development of Energy, Water and Environment Systems, 2018 Nowadays, building-integrated solar systems (i.e. photovoltaic modules installed directly in the façades) and concentrating solar systems are more popular.
Krzysztof Sornek +2 more
doaj +1 more source