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- Gregory Kozyreff, S. Jonathan Chapman
- Physical review letters
- 2006

We analyze stationary fronts connecting uniform and periodic states emerging from a pattern-forming instability. The size of the resulting periodic domains cannot be predicted with weakly nonlinear methods. We show that what determine this size are exponentially small (but exponentially growing in space) terms. These can only be computed by going beyond all… (More)

- Gregory Kozyreff, A. G. Vladimirov, Paul Mandel
- Physical review. E, Statistical, nonlinear, and…
- 2001

We study the dynamics of an array of single mode semiconductor lasers globally but weakly coupled by a common external feedback mirror and by nearest neighbor interactions. We seek to determine the conditions under which all lasers of the array are in phase, whether in a steady, periodic, quasiperiodic, or chaotic regime, in order to maximize the output far… (More)

- Gregory Kozyreff, Mustapha Tlidi
- Chaos
- 2007

We derive asymptotically an order parameter equation in the limit where nascent bistability and long-wavelength modulation instabilities coalesce. This equation is a variant of the Swift-Hohenberg equation that generally contains nonvariational terms of the form psinabla(2)psi and /nablapsi/(2). We briefly review some of the properties already derived for… (More)

- Gregory Kozyreff, S. Jonathan Chapman
- Physical review letters
- 2013

In pattern-forming systems, localized patterns are states of intermediate complexity between fully extended ordered patterns and completely irregular patterns. They are formed by stationary fronts enclosing an ordered pattern inside an homogeneous background. In two dimensions, the ordered pattern is most often hexagonal and the conditions for fronts to… (More)

- A. G. Vladimirov, Dmitry Turaev, Gregory Kozyreff
- Optics letters
- 2004

We propose a new model for passive mode locking that is a set of ordinary delay differential equations. We assume a ring-cavity geometry and Lorentzian spectral filtering of the pulses but do not use small gain and loss and weak saturation approximations. By means of a continuation method, we study mode-locking solutions and their stability. We find that… (More)

- A. G. Vladimirov, Dmitry V. Skryabin, Gregory Kozyreff, Paul Mandel, Mustapha Tlidi
- Optics express
- 2006

We consider a passive optical cavity containing a photonic crystal and a purely absorptive two-level medium. The cavity is driven by a superposition of two coherent beams forming a periodically modulated pump. Using a coupled mode reduction and direct numerical modeling of the full system we demonstrate the existence of bistability between uniformly… (More)

- Gregory Kozyreff, Pauline Assemat, S. Jonathan Chapman
- Physical review letters
- 2009

We analytically study the influence of boundaries on distant localized patterns generated by a Turing instability. To this end, we use the Swift-Hohenberg model with arbitrary boundary conditions. We find that the bifurcation diagram of these localized structures generally involves four homoclinic snaking branches, rather than two for infinite or periodic… (More)

- Romain Coussement, Yu V Rostovtsev, +9 authors Olga Kocharovskaya
- Physical review letters
- 2002

A significant reduction of absorption for single gamma photons has been experimentally observed by studying Mössbauer spectra of 57Fe in a FeCO3 crystal. The experimental results have been explained in terms of a quantum interference effect involving nuclear level anticrossing due to the presence of a combined magnetic dipole and electric quadrupole… (More)

- Umberto Bortolozzo, Luc Pastur, Pier Luigi Ramazza, Mustapha Tlidi, Gregory Kozyreff
- Physical review letters
- 2004

We report the observation of different localized structures coexisting for the same parameter values in an extended system. The experimental findings are carried out in a nonlinear optical interferometer and are fully confirmed by numerical simulations. The existence of each kind of localized structure is put in relation to a corresponding delocalized… (More)

- J.L. Dominguez-Juarez, Gregory Kozyreff, J Martorell
- Nature communications
- 2011

Unmarked sensitive detection of molecules is needed in environmental pollution monitoring, disease diagnosis, security screening systems and in many other situations in which a substance must be identified. When molecules are attached or adsorbed onto an interface, detecting their presence is possible using second harmonic light generation, because at… (More)