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Inferring brain connectivity and structure \textit{in-vivo} requires accurate estimation of the orientation distribution function (ODF), which encodes key local tissue properties. However, estimating the ODF from diffusion MRI (dMRI)…

图像与视频处理 · 电气工程与系统科学 2024-02-07 William Consagra , Lipeng Ning , Yogesh Rathi

We introduce a two-dimensional (2D) discrete nonlinear Schr\"{o}dinger (DNLS) equation with self-attractive cubic nonlinearity in a rotating reference frame. The model applies to a Bose-Einstein condensate stirred by a rotating strong…

斑图形成与孤子 · 物理学 2009-11-13 J. Cuevas , B. A. Malomed , P. G. Kevrekidis

Far-field slit-diffraction of circular optical-vortex (OV) beams is efficient for measurement of the topological charge (TC) magnitude but does not reveal its sign. We show that this is because in the common diffraction schemes the…

光学 · 物理学 2020-10-13 A. Bekshaev , L. Mikhaylovskaya , S. Patil , V. Kumar , R. P. Singh

The optical reflection coefficient of a dielectric medium moving uniformly in the plane spanned by its surface is rigorously calculated using classical electrodynamics and special relativity, and expressed in the Fourier domain, as a…

We investigate the Kerr and magneto-optical effects for a probe laser field with two orthogonally polarized components, propagating in a cold Rydberg atomic gas with an inverted-Y-type level configuration via double electromagnetically…

原子物理 · 物理学 2021-04-23 Yue Mu , Lu Qin , Zeyun Shi , Guoxiang Huang

Optical Feshbach resonances (OFRs) allow one to control cold atomic scattering, produce ultracold molecules and study atomic interactions via photoassociation spectroscopy. In the limit of ultracold s-wave collisions the strength of an…

原子物理 · 物理学 2023-06-02 Mateusz Borkowski

Materials that exhibit high nonlinear optical (NLO) susceptibilities are considered as promising candidates for a wide range of photonic and electronic applications. Here we argue that the ferroelectric nematic (NF) materials have…

软凝聚态物质 · 物理学 2022-03-22 C. L. Folcia , J. Ortega , R. Vidal , T. Sierra , J. Etxebarria

This paper presents a tutorial review of nonlocal interferometry. The role of the Feynman propagator in optical coherence is also discussed, including the possibility of generating optical coherence and entanglement outside of the light…

量子物理 · 物理学 2008-07-18 J. D. Franson

We use a time-dependent dynamical mean-field-hydrodynamic model to predict and study bright solitons in a degenerate fermion-fermion mixture in a quasi-one-dimensional cigar-shaped geometry using variational and numerical methods. Due to a…

其他凝聚态物理 · 物理学 2009-11-13 Sadhan K. Adhikari

We study the asymptotical compatibility of the Fourier spectral method in multidimensional space for the Nonlocal Ohta-Kawasaka (NOK) model, which is proposed in our previous work. By introducing the Fourier collocation discretization for…

数值分析 · 数学 2023-11-28 Wangbo Luo , Yanxiang Zhao

Active mode mismatch sensing and control can facilitate optimal coupling in optical cavity experiments such as interferometric gravitational wave detectors. In this paper, we demonstrate a radio-frequency (RF) beam wavefront curvature…

光学 · 物理学 2025-02-20 Liu Tao , Mauricio Diaz-Ortiz , Paul Fulda

We show that ballistic transport of optically excited atoms in an atomic vapor provides a nonlocal nonlinearity which stabilizes the propagation of vortex beams and higher order modes in the presence of a self-focusing nonlinearity.…

光学 · 物理学 2007-08-06 S. Skupin , M. Saffman , W. Krolikowski

We propose an approach to far-field optical imaging beyond the diffraction limit. The proposed system allows image magnification, is robust with respect to material losses and can be fabricated by adapting existing metamaterial technologies…

光学 · 物理学 2009-11-13 Zubin Jacob , Leonid V. Alekseyev , Evgenii Narimanov

Nonlocality is a key feature of many physical systems since it prevents a catastrophic collapse and a symmetry-breaking azimuthal instability of intense wave beams in a bulk self-focusing nonlinear media. This opens up an intriguing…

斑图形成与孤子 · 物理学 2017-02-16 V. M. Biloshytskyi , A. O. Oliynyk , P. M. Kruglenko , A. S. Desyatnikov , A. I. Yakimenko

A model of a Bose-Einstein condensate in a ring optical lattice with atomic dissipations applied at a stationary or at a moving location on the ring is presented. The localized dissipation is shown to generate and stabilize both stationary…

斑图形成与孤子 · 物理学 2016-11-23 Russell Campbell , Gian-Luca Oppo

Stability of off-site vortex solitons in a photorefractive optical lattice is analyzed. It is shown that such solitons are linearly unstable in both the high and low intensity limits. In the high-intensity limit, the vortex looks like a…

斑图形成与孤子 · 物理学 2009-11-10 Jianke Yang

Nonlinear phononics relies on the resonant optical excitation of infrared-active lattice vibrations to coherently induce targeted structural deformations in solids. This form of dynamical crystal-structure design has been applied to control…

应用物理 · 物理学 2021-05-19 Meredith Henstridge , Michael Först , Edward Rowe , Michael Fechner , Andrea Cavalleri

We have reviewed recent developments of some aspects of optical spatial solitons in photorefractive media. Underlying principles governing the dynamics of photorefractive nonlinearity have been discussed using band transport model.…

光学 · 物理学 2012-09-12 S. Konar , Anjan Biswas

We experimentally demonstrate the Talbot effect resulting from the repeated self-reconstruction of a spatially intensity-modulated probe field under the Fresnel near-field regime. By launching the probe beam into an optically induced atomic…

光学 · 物理学 2018-01-10 Zhaoyang Zhang , Xing Liu , Dan Zhang , Jiteng Sheng , Yiqi Zhang , Yanpeng Zhang , Min Xiao

Sub-wavelength confinement of mid-infrared light can be achieved exploiting the metal-like optical response of polar dielectric crystals in their Reststrahlen spectral region, where they support evanescent modes termed surface phonon…

介观与纳米尺度物理 · 物理学 2020-05-29 Christopher R. Gubbin , Simone De Liberato
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