Results 11 to 20 of about 24,731 (260)
Diffraction mode selection in planar lasers with Bragg resonators [PDF]
ITM Web of Conferences, 2019 Using the coupled-wave approach supplemented by the quasioptical approximation, we investigate the possibilities of diffraction mode selection with respect to the transverse index in planar distributed-feedback lasers.
Ginzburg Naum +5 more
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Synthesis and characterizations of (Ba1-xCax)Ti4O9, 0 ≤ x ≤ 0.9 ceramics
Journal of Materials Research and Technology, 2021 Manufacturing of energy storage devices with good efficiency and fewer losses has been a distinct topic. A material with good dielectric properties and fewer energy losses is the basic demand of the electronic industry.
Asad Ali +7 more
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Ultra-low threshold lasing through phase front engineering via a metallic circular aperture
Nature Communications, 2022 Low threshold lasing is widely required, especially for portable systems. Here the authors design a circular subwavelength metallic aperture in a QCL to shape its phase front and control diffraction losses, which in turn allows a lower threshold ...
Zhixin Wang +4 more
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Millimeter‐wave diffraction‐loss model based on over‐rooftop propagation measurements
ETRI Journal, 2020 Measuring the diffraction loss for high frequencies, long distances, and large diffraction angles is difficult because of the high path loss. Securing a well‐controlled environment to avoid reflected waves also makes long‐range diffraction measurements ...
Kyung‐Won Kim +5 more
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Data in Brief, 2021 In this data article, we present the spectroscopic structural data of the pottery samples collected from Petén Itzá, Guatemala. Detailed Fourier transmission infrared, powder X-ray diffraction, scanning electron microscopy coupled to electron dispersive ...
Kefa K. Onchoke +4 more
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Van Der Waals Materials for Subdiffractional Light Guidance
Photonics, 2022 Photonics is a natural next technological step after an era of electronics. However, the diffraction limit of light poses severe limitations on photonic elements and dictates their size.
Georgy Ermolaev +5 more
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International Journal of Antennas and Propagation, 2017 Applying propagation models with good accuracy is an essential issue for increasing the capacity and improving the coverage of cellular communication systems.
Ahmad S. Abdulrasool +2 more
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Rainfall and Diffraction Modeling for Millimeter-Wave Wireless Fixed Systems
IEEE Access, 2020 Rain attenuation is the main practical problem that confronts wireless signals specifically when it uses millimeter-waves for fifth-generation (5G) communication systems.
Zaid Ahmed Shamsan
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Properties of NGO 3% Silicon Steel Asymmetrically Cold Rolled [PDF]
Materials Research, 2015 The effects of asymmetric and conventional deformations and annealing on the microstructure of non-grain-oriented (NGO) 3 wt% silicon steel were analyzed by x-ray diffraction, optical microscopy and magnetometry.
Ramon Alves Botelho +3 more
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Optical loss due to diffraction by concentrator Fresnel lenses [PDF]
AIP Conference Proceedings, 2014 Fresnel lenses are widely used in concentrating photovoltaic (CPV) systems as a primary optical element. They focus sunlight on small solar cells or on the entrance apertures of secondary optical elements. A Fresnel lens consists of several prism rings and diffraction by these prism rings is unavoidable.
Hornung, T., Nitz, P.
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