Results 21 to 27 of about 2,856 (27)

Quantum Theory of Superresolution for Two Incoherent Optical Point Sources

open access: yes, 2016
Rayleigh's criterion for resolving two incoherent point sources has been the most influential measure of optical imaging resolution for over a century. In the context of statistical image processing, violation of the criterion is especially detrimental ...
Lu, Xiao-Ming   +2 more
core   +2 more sources

Understanding the electromagnetic 4-potential in the tetrad bundle

open access: yes, 2018
Separation of the spin and orbital angular momenta of the electromagnetic field has been discussed frequently in recent years. The spin and orbital angular momenta cannot be made simultaneously gauge invariant and Lorentz covariant and are not conserved ...
Hao, Yufang   +2 more
core   +1 more source

Frequency converter implementing an optical analogue of the cosmological redshift

open access: yes, 2010
According to general relativity, the frequency of electromagnetic radiation is altered by the expansion of the universe. This effect--commonly referred to as the cosmological redshift--is of utmost importance for observations in cosmology.
Balazs   +26 more
core   +1 more source

Protecting OAM Photons from Decoherence in a Turbulent Atmosphere

open access: yes, 2013
One of the most important properties of orbital angular momentum (OAM) of photons is that the Hilbert space required to describe a general quantum state is infinite dimensional.
Alonso, Jose Raul Gonzalez, Brun, Todd
core   +1 more source

Nonlocality in uniaxially polarizable media

open access: yes, 2015
We reveal extraordinary electromagnetic properties for a general class of uniaxially polarizable media. Depending on parameters, such metamaterials may have wide range of nontrivial shapes of isofrequency contours including lemniscate, diamond and ...
Belov, Pavel A., Gorlach, Maxim A.
core   +1 more source

Transverse rotation of the momentary field distribution and the orbital angular momentum of a light beam

open access: yes, 2008
The transverse beam pattern, usually observed in experiment, is a result of averaging the optical-frequency oscillations of the electromagnetic field distributed over the beam cross section.
A Ya Bekshaev   +9 more
core   +1 more source

Incoherent lensless imaging via coherency back-propagation

open access: yes, 2017
The two-point complex coherence function constitutes a complete representation for scalar quasi-monochromatic optical fields. Exploiting dynamically reconfigurable slits implemented with a digital micromirror device, we report on measurements of the ...
Abouraddy, Ayman F.   +6 more
core   +1 more source

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