Results 21 to 30 of about 7,914 (285)
Reprogrammable optical phase array
Applied Optics, 2007 A novel reprogrammable optical phase array (ROPA) device is presented as a reconfigurable electro-optic element. One specific application of the ROPA, a 1 x 6 electro-optic space switch, is fully described. Switching angles are within 2 degrees , and switching is achieved through a complementary metal-oxide semiconductor (CMOS) controlled, diffraction ...
Madeleine, Mony +6 more
openaire +3 more sources
Observation of intensity flattened phase shifting enabled by unidirectional guided resonance
Nanophotonics, 2021 Phase-only light modulation is an important functionality for many optoelectronic applications. Although modulation efficiency can be significantly improved by using optical resonances, resonance detuning is always accompanied with dramatic intensity ...
Zhang Zixuan +5 more
doaj +1 more source
Flat Luneberg lens based on a printed circuit with curved conductors
Физика волновых процессов и радиотехнические системы, 2021 The use of a printed Luneberg lens is promising for powering ultra-wideband phased array antennas with full-azimuth scanning. This article describes in detail the model for constructing a flat Luneberg lens based on a printed circuit with curved ...
Konstantin A. Bykov +3 more
doaj +1 more source
Array projection optics. Multi-channel design for ultra slim projectors
, 2022 Paper 77161ACommon projection optics use a single aperture approach to create a magnified image on a screen. The transmitted flux of such systems always scales with their system dimensions thus preventing the realization of ultra compact devices along ...
Sieler, M. +3 more
core +1 more source
On the Design of Unconventional Optical Phased Array Antennas
, 2023 The design of unconventional optical phased array architectures suitable for implementation within photonic integrated circuits, is addressed. Starting from a set of free-space-optics beam pattern requirements, thinned array layouts are optimized using a
Anselmi N. +4 more
core +1 more source
Active Optics—Advances of Cycloid-like Variable Curvature Mirrors for the VLTI Array
Photonics, 2022 Elasticity theory and active optics led us to the discovery of three geometrical configurations of variable curvature mirrors (VCMs) that are either cycloid-like or tulip-like thickness distributions. Cycloid-like VCMs are generated by a uniform load—air
Gerard Rene Lemaitre +5 more
doaj +1 more source
Integrated circular optical phased array [PDF]
EPJ Web of Conferences, 2021 Existing OPAs are typically based on 2D rectangular arrays or 1D linear arrays. Both approaches present a limited field-of-view (FOV) due to the presence of the grating lobes when the element spacing is larger than λ/2. To address the need for an increased steering range, we propose a new design strategy of an OPA system utilizing a 2D circular phased ...
Liu Qiankun +5 more
openaire +2 more sources
Automated IBEX crawler for PAUT inspection for in-service ferromagnetic assets
e-Journal of Nondestructive Testing, 2023 In order to guarantee the safety of the gas production plants, Air Liquide conducts NDT inspections regularly closely following the assets’ maintenance plans.
Natalia Marcial Alfaro +7 more
doaj +1 more source
Internally sensed optical phased array
Optics Letters, 2013 Extending phased array techniques to optical frequencies is challenging because of the considerably smaller wavelengths and the difficulty of stabilizing the optical path lengths of multiple emitters to this level of precision. This is especially true under real-world conditions where thermal and vibrational disturbances cause path length variations ...
Bowman, David J +7 more
openaire +3 more sources
Vernier optical phased array lidar transceivers
Optics Express, 2022 Optical phased arrays (OPAs) which beam-steer in two dimensions (2D) are currently limited to grating row spacings well above a half wavelength. This gives rise to grating lobes along one axis which limit the field of view (FOV), introduce return signal ambiguity, and reduce the optical efficiency in lidar applications.
Nathan Dostart +7 more
openaire +2 more sources