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3 p, 124.5 KB |
Spin-induced angular momentum switching
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Fernández Calvo, Gabriel (Universitat Autònoma de Barcelona. Departament de Física) ;
Picón Álvarez, Antonio (Universitat Autònoma de Barcelona. Departament de Física)
When light is transmitted through optically inhomogeneous and anisotropic media the spatial distribution of light can be modified according to its input polarization state. A complete analysis of this process, based on the paraxial approximation, is presented, and we show how it can be exploited to produce a spin-controlled change in the orbital angular momentum of light beams propagating in patterned space-variant optical axis phase plates. [...]
2007 - 10.1364/OL.32.000838
Optics letters, Vol. 32, No. 7 (1 April 2007) , p. 838-840
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8 p, 644.8 KB |
Atomtronics with holes : coherent transport of an empty site in a triple-well potential :
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Benseny, Antoni (Universitat Autònoma de Barcelona. Departament de Física) ;
Fernández-Vidal, Sònia, 1978- (Universitat Autònoma de Barcelona. Departament de Física) ;
Bagudà, Joan (Universitat Autònoma de Barcelona. Departament de Física) ;
Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ;
Picón Álvarez, Antonio (Universitat Autònoma de Barcelona. Departament de Física) ;
Roso, Luis (Centro de Láseres Pulsados (Salamanca, Castella i Lleó)) ;
Birkl, Gerhard (Universität Darmstadt. Institut für Angewandte Physik, Technische) ;
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
American Physical Society
We investigate arrays of three traps with two fermionic or bosonic atoms. The tunneling interaction between neighboring sites is used to prepare multisite dark states for the empty site (i. e. , the hole) which allows for the coherent manipulation of its external degrees of freedom. [...]
2010 - 10.1103/PhysRevA.82.013604
Physical review. A, Vol. 82, Issue 1 (July 2010) , p. 013604-1-013604-8
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7 p, 824.8 KB |
Dipole spectrum structure of nonresonant nonpertubative driven two-level atoms
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Picón Álvarez, Antonio (Universitat Autònoma de Barcelona. Departament de Física) ;
Roso, Luis (Centro de Láseres Pulsados (Salamanca, Castella i Lleó)) ;
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
Varela, O. (Universidad de Salamanca. Departamento de Física Aplicada) ;
Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ;
Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ;
Plaja, L. (Universidad de Salamanca. Departamento de Física Aplicada) ;
American Physical Society
We analyze the dipole spectrum of a two-level atom excited by a nonresonant intense monochromatic field under the electric dipole approximation and beyond the rotating wave approximation. We show that the apparently complex spectral structure can be completely described by two families: harmonic frequencies of the driving field and field-induced nonlinear fluorescence. [...]
2010 - 10.1103/PhysRevA.81.033420
Physical review. A, Vol. 81, Issue 3 (March 2010) , p. 033420-1-033420-7
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9 p, 468.6 KB |
Two-center interferences in photoionization of a dissociating H2+ molecule
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Picón Álvarez, Antonio (University of Colorado at Boulder. Department of Physics) ;
Bahabad, A. (University of Colorado at Boulder. Department of Physics) ;
Kapteyn, H. C. (University of Colorado at Boulder. Department of Physics) ;
Murnane, M. M. (University of Colorado at Boulder. Department of Physics) ;
Becker, A. (University of Colorado at Boulder. Department of Physics) ;
American Physical Society
We analyze two-center interference effects in the yields of ionization of a dissociating hydrogen molecular ion by an ultrashort vuv laser pulse. To this end, we performed numerical simulations of the time-dependent Schrödinger equation for a H2+ model ion interacting with two time-delayed laser pulses. [...]
2011 - 10.1103/PhysRevA.83.013414
Physical review. A, Vol. 83, Issue 1 (January 2011) , p. 013414-1-013414-9
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