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We propose a new stress-sensing technique based upon measurement of light scattering produced by an array of birefringent waveguides. When external stress is applied to the array of waveguides, their optical properties are modified via the photo[...]texto impreso
We present a method for automatic determination of isostatics from the photoelastic measurement of isoclinics obtained by phase-shifting techniques. The method is based on the integration of two difference equations by use of a multigrid algorit[...]texto impreso
Electrons moving in a tilted periodic potential perform a periodic motion, known as Bloch oscillation. Within a semiclassical description, the crystal momentum increases linearly with time until it reaches the boundary of the first Brillouin zon[...]texto impreso
Gonzalez-Santander, C. ; Apostolova, T. ; Domínguez-Adame Acosta, Francisco | IOP Publishing Ltd. | 2013-08-21We calculate the binding energy of on-and off-center hydrogenic impurities in a parabolic quantum dot subjected to an intense high-frequency laser field. An exactly solvable model that replaces the actual Coulomb interaction with the donor by a [...]texto impreso
Moura, F. A. B. F., de ; Lyra, M. L. ; Domínguez-Adame Acosta, Francisco ; Malyshev, Andrey | IOP Publishing Ltd. | 2007-02-07We study numerically the dynamics of a one-electron wavepacket in a two-dimensional random lattice with long-range correlated diagonal disorder in the presence of a uniform electric field. The time-dependent Schrodinger equation is used for this[...]texto impreso
We present a formalism based upon dynamic programming (DP), to characterize light propagation in particular GRIN (gradient index) media by analyzing ray trajectories associated with skew-type rays. We study the conditions for the formation of pe[...]texto impreso
Malyshev, Andrey ; Díaz García, Elena ; Domínguez-Adame Acosta, Francisco | IOP Publishing Ltd. | 2009-08-19We present a theoretical analysis of the effects of the environment on charge transport in double-stranded synthetic poly(G)-poly(C) DNA molecules attached to two ideal leads. Coupling of the DNA to the environment results in two effects: (i) lo[...]texto impreso
The entropy maximum principle is applied to obtain the final equilibrium state in the free expansion of a perfect gas. This provides an example where the entropy of an isolated system at equilibrium has an absolute maximum which is not a local m[...]texto impreso
Quiroga Mellado, Juan Antonio ; González Cano, Agustín ; Bernabeu Martínez, Eusebio | IOP Publishing Ltd. | 1995-02A method to estimate in a fast and simple way the response of an image acquiring system (such as a charge-coupled device camera plus an image-processing board) for a monochromatic light source is presented. Two images, whose irradiances are rela[...]texto impreso
Díaz Herrera, Natalia ; Navarrete Fernández, María Cruz ; Esteban Martínez, Óscar ; González Cano, Agustín | IOP Publishing Ltd. | 2004-02A fibre-optic sensor has been developed for the measurement of temperature, especially of liquids. The device is conceived as part of an all-optical CTD probe for the control of the physical parameters of a marine medium. The dependence on tempe[...]texto impreso
Creffield, Charles E. ; Kornilovitch, P. E. ; Klepfish, E. G. ; Pike, E. R. ; Sarkar, Sarben | IOP Publishing Ltd. | 1997-05-05A Quantum Monte Carlo calculation of dynamical spin susceptibility in the half-filled 2D Hubbard model is presented for temperature T = 0.2t and an intermediate on-site repulsion U = 4t. Using the singular value decomposition technique we succee[...]texto impreso
Piquero Sanz, Gemma María ; Ramírez Sánchez, Victoria ; Santarsiero, Massimo | IOP Publishing Ltd. | 2009-08Recently introduced global parameters for describing the polarization of a beam are used to characterize spirally polarized fields, which include as particular cases azimuthally and radially polarized fields. Theoretical predictions about such g[...]texto impreso
Díaz Herrera, Natalia ; Esteban Martínez, Óscar ; Navarrete Fernández, María Cruz ; Le Haitre, Michel ; González Cano, Agustín | IOP Publishing Ltd. | 2006-08We have successfully proved the feasibility of an optical salinity meter for marine applications in a two-week measurement campaign, carried out for the realization of in situ salinity measurements in seawater. An optical instrument (optode), in[...]texto impreso
Carvalho, R.C.P. ; Lyra, M. L. ; de Moura, F.A.B.F. ; Domínguez-Adame Acosta, Francisco | IOP Publishing Ltd. | 2011-05-04We study the wavepacket dynamics in a two-channel Anderson model with correlated diagonal disorder. To impose correlations in the disorder distribution we construct the on-site energy landscape following both symmetric and antisymmetric rules. O[...]texto impreso
In a stratified graded-index medium the variation of the refractive index can be measured directly from the analysis of light paths. Only Snell's law and a simple set-up based on digitized images and a personal computer are needed.
