Zobrazeno 1 - 10
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pro vyhledávání: '"Ayman F"'
Autor:
Saari, Peeter, Besieris, Ioannis M.
Hall and Abouraddy [1] have reported first experimental observation of optical de Broglie-Mackinnon wave packets, which is a seminal achievement in the study of so-called non-diffracting optical pulses. These wave packets propagate in free space with
Externí odkaz:
http://arxiv.org/abs/2403.02343
Space-time wave packets (STWPs) are a new class of pulsed optical beams with many unique and intriguing attributes, including propagation invariance and tunable group velocity in linear optical media. STWPs are a form of spatiotemporally structured l
Externí odkaz:
http://arxiv.org/abs/2405.14102
Autor:
Hall, Layton A., Abouraddy, Ayman F.
All linear, propagation-invariant, paraxial pulsed beams are spatiotemporally X-shaped (conical waves) in absence of group-velocity dispersion (GVD), or in presence of normal GVD. It is known, however, that such conical waves become O-shaped in prese
Externí odkaz:
http://arxiv.org/abs/2405.14095
For partially coherent optical fields in which a single binary degree of freedom (DoF) is relevant, such as polarization, entropy uniquely identifies the class of optical fields that can be converted into each other via unitary transformations. Howev
Externí odkaz:
http://arxiv.org/abs/2404.12532
We introduce a taxonomy for partially coherent optical fields spanning multiple degrees of freedom (DoFs) based on the rank of the associated coherence matrix (the number of non-zero eigenvalues). When DoFs comprise two spatial modes and polarization
Externí odkaz:
http://arxiv.org/abs/2310.14012
It is now well-understood that a Lorentz boost of a spatially coherent monochromatic optical beam yields a so-called space-time wave packet (STWP): a propagation-invariant pulsed beam whose group velocity is determined by the relative velocity betwee
Externí odkaz:
http://arxiv.org/abs/2308.06387
Chirped Bragg volume gratings (CBGs) offer a useful alternative for spectral analysis, but increasing the bandwidth necessitates increasing the device area. In contrast, recently developed rotated CBGs (r-CBGs), in which the Bragg structure is rotate
Externí odkaz:
http://arxiv.org/abs/2307.06180
Autor:
Mahmoud M. Gabr, Sawsan M. El-Halawani, Ayman F. Refaie, Sherry M. Khater, Amani M. Ismail, Mary S. Karras, Raghda W. Magar, Shorouk El Sayed, Malgorzata Kloc, Ahmed Uosef, Omaima M. Sabek, Mohamed A. Ghoneim
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-15 (2024)
Abstract This study was to determine whether extracellular vesicles (EVs) derived from insulin-producing cells (IPCs) can modulate naïve mesenchymal stromal cells (MSCs) to become insulin-secreting. MSCs were isolated from human adipose tissue. The
Externí odkaz:
https://doaj.org/article/c763a3cff9ee422abf116a22f6795d92
Autor:
Hall, Layton A., Abouraddy, Ayman F.
de Broglie wave packets accompanying moving particles are dispersive and lack an intrinsic length scale dictated solely by the particle mass and velocity. Mackinnon proposed almost 45~years ago a localized non-dispersive wave packet constructed out o
Externí odkaz:
http://arxiv.org/abs/2302.13194