Results 71 to 80 of about 5,837,988 (197)
Recent Advances in Programmable Metasurfaces and Meta‐Devices
Advanced Electronic Materials, EarlyView.Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao +4 more
wiley +1 more source
Advanced Electronic Materials, EarlyView.A compact passive engineered surface converts changes in microwave frequency into many distinct illumination patterns, allowing nearby objects to be imaged without mechanical scanning, active tuning, or a large antenna array. Operating from 18 to 28 GHz, the single‐port system uses measured field patterns to reconstruct metallic targets and distinguish
Mohammed H. Arif +6 more
wiley +1 more source
DESIGN AND FABRICATION OF HOLOGRAPHIC OPTICAL ELEMENTS AND KINOFORMS
, 1997 "The thesis gives an account of the most important papers found in the literature. They describe the methods employed to generate and to improve the quality of computer generated holograms, different techniques used to code them, and a number of ...
JESUS RAFAEL MOYA CESSA
core
Aberration-free lithography setup for fabrication of holographic diffractive optical elements.
, 2009 A holographic optical lithography setup with extremely small longitudinal spherical aberration is described. The setup is used for the fabrication of holographic diffractive optical elements intended to collect light emitted from a fluorescence spot ...
MACKO Peter +3 more
core +1 more source
PhotonicsInfrared optical vortices are used in the field of optical communications at wavelengths around 1550 nm. A versatile method to generate them is with a Spatial Light Modulator (SLM); however, they are expensive devices and cannot be easily integrated into
Álvaro Paredes-Amorín +3 more
doaj +1 more source
High environmentally compatible photopolymer for waveguide couplers [PDF]
EPJ Web of ConferencesAugmented reality and see-through displays have become a hot topic in holography and in the development of holographic recording materials. Designing holograms for these applications depends strongly on the recording material, and therefore both the ...
Sirvent-Verdu J. J. +5 more
doaj +1 more source
Physical Unclonable Functions From Microwave Metasurface Fingerprints
Advanced Electronic Materials, EarlyView.Nominally identical metasurfaces fabricated through standard PCB processes inevitably contain microscopic fabrication imperfections. This work demonstrates that these unavoidable electromagnetic deviations can serve as unique physical unclonable fingerprints for wireless authentication.
Guanxiong Shen +4 more
wiley +1 more source
Holographic fabrication of reconfigurable diffractive elements [PDF]
EPJ Web of ConferencesThe fabrication of Diffractive Optical Elements (DOEs) involves the analog patterning of material surfaces on the scale of light wavelength. This typically requires multi-step lithographic processes.
Reda Francesco +4 more
doaj +1 more source
Holographic Mapping of Orbital Angular Momentum using a Terahertz Diffractive Optical Neural Network
Advanced Intelligent Discovery, EarlyView.A compact six‐layer diffractive optical neural network enables direct recognition and spatial mapping of terahertz (THz) orbital angular momentum (OAM) beams. Fabricated by 3D printing, the system distinguishes nine OAM modes and their superpositions with high fidelity, good efficiency, and low crosstalk, offering a scalable solution for THz ...
Wei Jia +3 more
wiley +1 more source
Diffractional analysis of holographic optical elements recorded on cylindrical substrates
, 1993 The image quality of holographic optical elements recorded with spherical wavefronts on cylindrical substrates is analyzed using diffraction theory. The computation of point spread functions for aberration-free and angular misadjustment cases is done by ...
Carretero López, Luis +3 more
core +1 more source