Results 21 to 30 of about 19,487 (306)
Photonics, 2022 We demonstrate two-dimensional beam steering through wavelength control using a one-dimensional optical phased array (OPA) in which a path difference is built up in each channel to allocate a phase delay sequentially.
Hyeonho Yoon +6 more
doaj +1 more source
Measured and simulated performance of a ceramic micromechanical beam steering device at 94 GHz [PDF]
, 2008 We report the first experimental demonstration of a transmission-mode micromechanical beam steering device for use in standoff terahertz imaging and spectroscopy.
Drysdale, T.D. +5 more
core +1 more source
Non-mechanical beam steering: ways and means [PDF]
, 2018 One of the very useful aspects of a laser is its well-defined beam, delivering high intensity to a defined location. Directing that beam and specifying the location is generally done with adjustable mirrors. Directing the beam in time varying manner most
Benton, David
core +1 more source
The impact of a 1.5 T MRI linac fringe field on neighbouring linear accelerators
Physics and Imaging in Radiation Oncology, 2017 Background and purpose: This study investigates the influence of an MRI linac fringe field on neighbouring radiotherapy accelerators and whether restoring their original steering calibration can be used to shorten downtime after changes of the magnetic ...
Thijs Perik +2 more
doaj +1 more source
Beam Steering with Segmented Annular Arrays [PDF]
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2006 Two-dimensional (2-D) arrays of squared matrix have maximum periodicity in their main directions; consequently, they require half wavelength (lambda/2), interelement spacing to avoid grating lobes. This condition gives rise to well-known problems derived from the huge number of array elements and from their small size.
Ullate, Luis G. +3 more
openaire +3 more sources
Optically Controlled Beam-steering Wireless Systems [PDF]
Optical Fiber Communication Conference (OFC) 2020, 2020 Wavelength-controlled 2D steering of mm-wave beams and infrared beams provides high communication capacity, privacy and energy efficiency. Using diffractive elements and accurate user localization, delivery of multiple 10GbE video streams by infrared beams is demonstrated.
Koonen, A.M.J. (Ton) +5 more
openaire +3 more sources
Crystals, 2022 A novel beam steering angle expander is demonstrated by cascading two polymeric liquid crystal polarization lenses with different diopters. The lens module performs as a planar telescope, which has features such as a light weight, low cost, and high ...
Yannanqi Li, Zhenyi Luo, Shin-Tson Wu
doaj +1 more source
Beam steering by χ^(2) trapping
Optics Letters, 1995 We show numerically the mutual dragging and locking together of intense fundamental and second-harmonic light beams propagating in second-order nonlinear media, and we discuss the potential applications of such effects for the steering of beams by spatial phase modulation of the input signals.
Torner Sabata, Lluís +3 more
openaire +4 more sources
A micromechanical beam-steering device for terahertz systems [PDF]
, 2004 Beam-steering techniques are required to fully exploit terahertz imaging systems. We propose and model a device employing artificial dielectric techniques to provide a variable phase-control medium.
Drysdale, T.D., Cumming, D.R.S.
core +1 more source
Two-Dimensional Beam Steering Based on Compact Programmable Coding Metasurface
Applied Sciences, 2022 A programmable coding metasurface provides unprecedented flexibility to manipulate electromagnetic waves dynamically. By controlling the peculiarity of subwavelength artificial atoms, devices with metasurfaces perform various functionalities.
Fei Yang +6 more
doaj +1 more source