Results 21 to 30 of about 1,171,647 (287)

Shear capacity of reinforced concrete beams using neural network [PDF]

, 2007
NoOptimum multi-layered feed-forward neural network (NN) models using a resilient back-propagation algorithm and early stopping technique are built to predict the shear capacity of reinforced concrete deep and slender beams.
Song, J-K., Yang, Keun-Hyeok, Ashour, Ashraf   +2 more
core   +4 more sources

Multimode vector beam synthesis and rapid modulation via interferometric methods [PDF]

AIP Advances
Optical interference techniques are widely regarded as an effective approach for generating vector beams. In this paper, we theoretically simulate the generation of multimode vector beams through the vortex beams interference. Then, in the experiment, we
Qiyou Huang, Zhenye Ge, Duigao Yi, Kaibin Xu, Renfei Zheng, Zhifei Yu, Ting Zhang, Bing Chen   +7 more
doaj   +1 more source

Nonparaxial accelerating Bessel-like beams [PDF]

, 2013
A new class of nonparaxial accelerating optical waves is introduced. These are beams with a Bessel-like profile that are capable of shifting laterally along fairly arbitrary trajectories as the wave propagates in free space.
Chremmos, Ioannis, Chremmos, I., Ioannis D. Chremmos, Nikolaos K. Efremidis, Efremidis, Nikolaos K., Efremidis, N.   +5 more
core   +1 more source

Generation of terahertz vector beams using dielectric metasurfaces via spin-decoupled phase control

Nanophotonics, 2020
Cylindrical vector beams (CVBs), being a special kind of beams with spatially variant states of polarizations, are promising in photonics applications, including high-resolution imaging, plasmon excitation, optical trapping, and laser machining. Recently,
Xu Yuehong, Zhang Huifang, Li Quan, Zhang Xueqian, Xu Quan, Zhang Wentao, Hu Cong, Zhang Xixiang, Han Jiaguang, Zhang Weili   +9 more
doaj   +1 more source

Enhancement of Optical Spin-Orbit Coupling in Anisotropic ENZ Metamaterials

IEEE Photonics Journal, 2023
Vector vortex beams which possess complex intensity and polarisation patterns, and phase or polarisation singularities are important in a variety of applications ranging from high resolution imaging and data transmission to nonlinear optics and quantum ...
Vittorio Aita, Anatoly V. Zayats
doaj   +1 more source

Tip-Enhanced Raman Spectroscopy with High-Order Fiber Vector Beam Excitation

Sensors, 2018
We investigated tip-enhanced Raman spectra excited by high-order fiber vector beams. Theoretical analysis shows that the high-order fiber vector beams have stronger longitudinal electric field components than linearly polarized light under tight focusing
Fanfan Lu, Tengxiang Huang, Lei Han, Haisheng Su, Heng Wang, Min Liu, Wending Zhang, Xiang Wang, Ting Mei   +8 more
doaj   +1 more source

Theoretical Study on Generation of Multidimensional Focused and Vector Vortex Beams via All-Dielectric Spin-Multiplexed Metasurface

Nanomaterials, 2022
The optical vortex (OV) beams characterized by orbital angular momentum (OAM) possess ubiquitous applications in optical communication and nanoparticle manipulation.
Yue Liu, Li Chen, Chengxin Zhou, Kuangling Guo, Xiaoyi Wang, Yuhan Hong, Xiangbo Yang, Zhongchao Wei, Hongzhan Liu   +8 more
doaj   +1 more source

Vector Beam Bending

, 2021
It is well known that the trajectory of a light beam can curve if the medium in which the beam propagates is inhomogeneous or if the local spacetime is curved. In this paper we present a third possibility and show that a properly-prepared optical beam follows a curved trajectory even in free space where the spacetime is locally flat.
Nichols, J. M., Nickel, D. V., Bucholtz, F.   +2 more
openaire   +2 more sources

Influence of section depth on the structural behaviour of reinforced concrete continuous deep beams [PDF]

, 2007
YesAlthough the depth of reinforced concrete deep beams is much higher than that of slender beams, extensive existing tests on deep beams have focused on simply supported beams with a scaled depth below 600 mm.
Yang, Keun-Hyeok, Ashour, Ashraf
core   +1 more source

Orbital angular momentum: origins, behavior and applications [PDF]

, 2011
As they travel through space, some light beams rotate. Such light beams have angular momentum. There are two particularly important ways in which a light beam can rotate: if every polarization vector rotates, the light has spin; if the phase structure ...
Padgett, M.J., Yao, Alison, Padgett, Miles, Alison M. Yao, Miles J. Padgett, Yao, A.M.   +5 more
core   +1 more source