Results 111 to 120 of about 96,151 (324)

Controlling the path of discretized light in waveguide lattices

open access: yes, 2011
A general method for flexible control of the path of discretized light beams in homogeneous waveguide lattices, based on longitudinal modulation of the coupling constant, is theoretically proposed.
C. Gómez-Reino, Stefano Longhi
core   +1 more source

Femtosecond Single‐ and Double‐Pulse Fabrication of Periodic Nanostructures on Stainless Steel for Surface‐Enhanced Raman Spectroscopy

open access: yesAdvanced Engineering Materials, EarlyView.
Periodic submicron features are fabricated on 304 stainless steel using single and double femtosecond laser pulses. By adjusting polarization, fluence, and inter‐pulse delay, 1D and 2D nanostructures are formed. Enhanced hydrophobicity and dense surface‐enhanced Raman spectroscopy hotspots enable analyte detection down to 10−10 M with good ...
Balaji Baskar   +3 more
wiley   +1 more source

X‐Ray Computed Tomography Quantifies Primary Phases and Reveals Crack Morphology in High‐Cycle Fatigue of Aluminum Alloy EN AW‐2618A

open access: yesAdvanced Engineering Materials, EarlyView.
Primary phases and a fatigue crack are studied in a forged blank of an aluminum alloy using synchrotron and laboratory X‐ray computed tomography. To image the crack, the fatigue test is interrupted, and a static tensile load is applied to open the crack.
Jakob Schröder   +6 more
wiley   +1 more source

Electronically Controllable Varactor Loaded Beam Switchable 4-Element Array Antenna for Sub-6 GHz Application

open access: yesIEEE Access
In this paper, we present a 4-element varactor loaded switched beam array antenna, which is configured using a switch-line phase shifting mechanism and varactor diodes in the Sub-6 GHz band ranging from 5.8 to 6.6 GHz.
Pooja Panda   +2 more
doaj   +1 more source

Experimental demonstration of a global dispersion-free steering correction at the new linac test facility at SLAC

open access: yesPhysical Review Special Topics. Accelerators and Beams, 2014
The performance of future linear colliders will depend critically on beam-based alignment and feedback systems. In ILC and CLIC it is planned to perform dispersion-free steering in the main linacs.
A. Latina   +5 more
doaj   +1 more source

Additive Manufacturing of Highly Alloyed Aluminum–Lithium

open access: yesAdvanced Engineering Materials, EarlyView.
Al–Li alloys, promising for future lightweight constructions due to their low density and high stiffness, are limited to 9 at% lithium in commercial forms because of segregation issues. To overcome this traditional limitation, powder bed fusion with an ultrashort pulse laser is used.
Lisa Matthäus   +4 more
wiley   +1 more source

3-D Printable Metal-Dielectric Metasurface for Risley Prism-Based Beam-Steering Antennas

open access: yesIEEE Access
A 3-D printable, planar, metal-dielectric metasurface-based, 2-D beam-steering system for aperture-type antennas is presented in this paper. This beam-steering system, also known as the near-field meta-steering system, comprises two fully passive phase ...
Md Yeakub Ali   +4 more
doaj   +1 more source

Practicality of electronic beam steering for MST/ST radars, part 6.2A [PDF]

open access: yes
Electronic beam steering is described as complex and expensive. The Sunset implementation of electronic steering is described, and it is demonstrated that such systems are cost effective, versatile, and no more complex than fixed beam alternatives ...
Clark, W. L., Green, J. L.
core   +1 more source

Experimental generation of steering odd dark beams of finite length [PDF]

open access: green, 2000
A. Dreischuh   +3 more
openalex   +1 more source

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