Zobrazeno 1 - 10
of 1 025
pro vyhledávání: '"Staliunas K"'
We show that the simultaneous modulation of the propagation constant and of the gain/loss coefficient along the multimode fibers results in unidirectional coupling among the modes, which, depending on the modulation parameters, leads to the enhanceme
Externí odkaz:
http://arxiv.org/abs/2211.12762
Non-Hermitian systems offer new platforms for unusual physical properties that can be flexibly manipulated by redistribution of the real and imaginary parts of refractive indices, whose presence breaks conventional wave propagation symmetries, leadin
Externí odkaz:
http://arxiv.org/abs/2204.13376
We propose and explore a physical mechanism for the stabilization of the complex spatiotemporal dynamics in arrays (bars) of broad area laser diodes taking advantage of the symmetry breaking in non-Hermitian potentials. We show that such stabilizatio
Externí odkaz:
http://arxiv.org/abs/2106.08763
We propose a general design strategy based on genetic optimization to realize asymmetric reflectivity in periodic and non-periodic planar structures containing dielectric and gain-loss layers. By means of an optimization algorithm, it is possible to
Externí odkaz:
http://arxiv.org/abs/2008.12057
Publikováno v:
Phys. Rev. Applied 14, 044010 (2020)
Non-Hermitian systems exploiting the synergy between gain and loss have recently become the focus of interest to discover novel physical phenomena. The spatial symmetry breaking in such systems allows tailoring the wave propagation at will. Inspired
Externí odkaz:
http://arxiv.org/abs/2002.01817
We propose a novel physical mechanism based on periodic non-Hermitian potentials to efficiently control the complex spatial dynamics of broad-area lasers, particularly in Vertical-Cavity Surface-Emitting Lasers (VCSELs), achieving a stable emission o
Externí odkaz:
http://arxiv.org/abs/1902.04915
We provide a numerical proof of concept of a stabilization mechanism for BAS laser sources. The scheme is based on the simultaneous introduction of in-phase two-dimensional modulations on the refractive index and pump (gain). We numerically proof tot
Externí odkaz:
http://arxiv.org/abs/1802.06256
We show that the emission of broad area semiconductor amplifiers and lasers can be efficiently stabilized by introducing, two-dimensional periodic modulations simultaneously on both the refractive index and the pump (gain-loss) profiles, in the trans
Externí odkaz:
http://arxiv.org/abs/1801.03878
Publikováno v:
Phys. Rev. Lett. 120, 213902 (2018)
We predict the onset of self-induced parametric or Faraday instabilities in a laser, spontaneously induced by the presence of pump depletion in the cavity, which leads to a periodic gain landscape for light propagating in the cavity. As a result of t
Externí odkaz:
http://arxiv.org/abs/1712.06625
Publikováno v:
Phys. Rev. A 96 043852 (2017)
Electromagnetic response of PT-dipole is studied both analytically and numerically. In analytical approach, dipole is represented by two point scatterers. Within the first Born approximation, the asymmetry of the scattering field with respect to the
Externí odkaz:
http://arxiv.org/abs/1710.09092