Results 11 to 20 of about 8,096 (140)

Polarization Strips in the Focus of a Generalized Poincaré Beam

Photonics
We analyze the tight focusing of a generalized Poincaré beam using a Richards–Wolf formalism. Conventional Poincaré beams are superpositions of two Laguerre–Gaussian beams with orthogonal polarization, while the generalized Poincaré beams are composed of
Victor V. Kotlyar, Alexey A. Kovalev, Alexey M. Telegin, Elena Sergeevna Kozlova   +3 more
doaj   +3 more sources

Sharp focusing of a light field with polarization and phase singularities of an arbitrary order [PDF]

Компьютерная оптика, 2019
Using the Richards-Wolf formalism, we obtain general expressions for all components of the electric and magnetic strength vectors near the sharp focus of an optical vortex with the topological charge m and nth-order azimuthal polarization.
Victor Kotlyar, Sergey Stafeev, Alexey Kovalev   +2 more
doaj   +1 more source

Experimental investigation of the energy backflow in the tight focal spot

Компьютерная оптика, 2020
Using two identical microobjectives with a numerical aperture NA = 0.95, we experimentally demonstrate that the on-axis intensity near the tight focal spot of an optical vortex with a topological charge 2 is zero for right-handed circular polarization ...
V.V. Kotlyar, S.S. Stafeev, A.G. Nalimov , A.A. Kovalev , A.P. Porfirev   +4 more
doaj   +1 more source

Photometric Redshift Biases from Galaxy Evolution [PDF]

, 2010
Proposed cosmological surveys will make use of photometric redshifts of galaxies that are significantly fainter than any complete spectroscopic redshift surveys that exist to train the photo-z methods.
C. Jonathan MacDonald, Gary Bernstein, Huterer D.   +2 more
core   +3 more sources

On the radiative efficiencies, Eddington ratios, and duty cycles of luminous high-redshift quasars [PDF]

, 2010
We investigate the characteristic radiative efficiency \epsilon, Eddington ratio \lambda, and duty cycle P_0 of high-redshift active galactic nuclei (AGN), drawing on measurements of the AGN luminosity function at z=3-6 and, especially, on recent ...
Adelberger, Barger, Barger, Basilakos, Bentz, Bryan, Coil, Cool, David H. Weinberg, De Zotti, Di Matteo, Dutton, Eddington, Eisenstein, Fan, Fan, Ferrarese, Ferrarese, Francesco Shankar, Francke, Gebhardt, Gnedin, Graham, Greene, Gultekin, Haiman, Haiman, Hennawi, Ho, Ho, Hopkins, Hopkins, Hopkins, Hunt, Häring, Jiang, Jing, Jordi Miralda-Escudé, Kollmeier, Kurk, La Franca, Lapi, Lauer, Li, Magorrian, Marconi, Martin Crocce, Martini, Merritt, Mo, Myers, Netzer, Pablo Fosalba, Peng, Pizzella, Richards, Richards, Richards, Richards, Scannapieco, Schneider, Shankar, Shankar, Shankar, Shankar, Shankar, Shen, Shen, Shen, Shen, Shields, Silverman, Small, Sołtan, Spergel, Steed, Strand, Tanaka, Thacker, Tremaine, Treu, Tundo, Ueda, Volonteri, Volonteri, Wechsler, Wyithe, Wyithe, York, Yu, Yu   +90 more
core   +2 more sources

Energy-momentum balance in quantum dielectrics [PDF]

, 2005
We calculate the energy-momentum balance in quantum dielectrics such as Bose-Einstein condensates. In agreement with the experiment [G. K. Campbell et al. Phys. Rev. Lett.
L. D. Landau, L. D. Landau, L. D. Landau, L. P. Pitaevskii, M. Abraham, M. Born, R. Peierls, R. V. Jones, R. V. Jones, Ulf Leonhardt, W. C. Röntgen, W. Gordon   +11 more
core   +2 more sources

The Non-Vortex Inverse Propagation of Energy in a Tightly Focused High-Order Cylindrical Vector Beam

IEEE Photonics Journal, 2019
In this paper, the tight focusing of high-order cylindrical vector beams (beams with polarization singularity) was investigated. Using the Richards–Wolf formalism, there were obtained expressions for all projections of the electric and magnetic ...
Sergey S. Stafeev, Victor V. Kotlyar, Anton G. Nalimov, Elena S. Kozlova   +3 more
doaj   +1 more source

Eigenfunction expansion of the electric fields in the focal region of a high numerical aperture focusing system [PDF]

, 2008
Published ...
Foreman, MR, Sherif, SS, Torok, P
core   +1 more source

An Observational Determination of the Bolometric Quasar Luminosity Function [PDF]

, 2006
We combine a large set of quasar luminosity function (QLF) measurements from the rest-frame optical, soft and hard X-ray, and near- and mid-infrared bands to determine the bolometric QLF in the redshift interval z=0-6.
Boyle B. J., Comastri A., Fioc M., Gilli R., Gordon T. Richards, Hasinger G., Kormendy J., Lars Hernquist, Lawrence A., Magdziarz P., Miyaji T., Nandra K., Page M. J., Philip F. Hopkins, Silk J., Soltan A.   +15 more
core   +2 more sources

Machine-assisted discovery of relationships in astronomy [PDF]

, 2013
High-volume feature-rich data sets are becoming the bread-and-butter of 21st century astronomy but present significant challenges to scientific discovery.
Djorgovski, S. G., Donalek, Ciro, Drake, Andrew J., Graham, Matthew J., Mahabal, Ashish A.   +4 more
core   +2 more sources