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Приказ резултата 1931-1940 од 2184
Dynamics of dark solitons localized at structural defect in one-dimensional photonic lattices with defocusing saturable nonlinearity
(Europhysics Letters / EPL, 2013)
We investigated the influence of the structural defect placed inside uniform photonic lattice on existence and dynamics of dark spatially localized defect modes. Depending on the strength of the defect and considering the ...
Control of light propagation in one-dimensional quasi-periodic nonlinear photonic lattices
(Journal of Optics, 2014)
We investigate light localization in quasi-periodic nonlinear photonic lattices (PLs) composed of two periodic component lattices of equal lattice potential strength and incommensurate spatial periods. By including the ...
Discrete localized modes supported by an inhomogeneous defocusing nonlinearity
(Physical Review E, 2013)
We report that infinite and semi-infinite lattices with spatially inhomogeneous self-defocusing (SDF) onsite nonlinearity, whose strength increases rapidly enough toward the lattice periphery, support stable unstaggered ...
Gain optimization in intersubband quantum well lasers by inverse spectral theory
(Solid State Communications, 1999)
A systematic procedure is described for the maximization of gain in optically pumped intersubband lasers, via tailoring the quantum well potential. The procedure relies on the inverse spectral theory, which enables shifting ...
Delay times in a terahertz chiral metamaterial slab
(Physical Review A, 2016)
We investigate the propagation of circularly polarized electromagnetic waves through a free-standing Omega particle chiral metamaterial slab and study the associated delay times: dwell time and group delay. Through this ...
Surface composition and structure of Ni-Cr sputtered coatings exposed in air at room temperature
(Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 2007)
Nichrome coatings have been deposited using the d.c. sputtering of the target (80% Ni-20% Cr wt.) by Ar+ ions at a working pressure of 10(-1) Pa and at room temperature. After the air exposure of samples at room temperature, ...
Optimization and magnetic-field tunability of quantum cascade laser for applications in trace gas detection and monitoring
(Journal of Physics. D: Applied Physics, 2010)
We explore the possibilities of using advanced tools for global optimization, namely the genetic algorithm, to obtain structural parameters of gain-maximized quantum cascade laser (QCL) emitting at specified wavelengths, ...
Goos-Hanchen shift and time delay in dispersive nonlinear media
(Physics Letters A, 2011)
We present an analysis of the influence of the Goos-Hanchen effect on tunneling times, group delay and dwell time, of electromagnetic waves propagating through an obstacle made of left-handed metamaterial embedded in a ...
Spin-dependent dwell times of electron tunneling through double- and triple-barrier structures
(Journal of Applied Physics, 2008)
We have analyzed the influence of Dresselhaus and Rashba spin-orbit couplings (caused by the bulk inversion asymmetry and the structural asymmetry, respectively) on electron tunneling through a double- and triple-barrier ...
Analysis of tunneling times in absorptive and dispersive media
(Journal of the Optical Society of America. B: Optical Physics, 2008)
Tunneling times in absorptive and dispersive media are considered, as are the relations between them. Group delay and dwell time are used as the most appropriate tunneling time characterizations. A general expression that ...