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We show how classical light can be used to simulate a nonclassical quantum process. Specially modulated optical waveguides were utilized to emulate two-mode squeezed vacuum states as the light amplitudes in our arrays correspond to the photon number distribution of the squeezed states. In our experiments demonstrate a transition from photon number growth to periodic Bloch oscillations for increased...
In this paper, curved nonlinear waveguide arrays are specially designed and numerically nonlinearly-induced symmetry breaking of the output beam profile is demonstrated. This phenomenon facilitates possibilities for tunable all-optical sorting of input ultra-broad spectrum beams into narrow spectrum output channels, realizing demultiplexing of individual spectral components.
In this work, we present a general approach for the realization of reflectionless potentials for periodic photonic structures in the form of coupled-resonator optical waveguides (CROW) or optical waveguide arrays. Wave transport in such systems is primarily defined through tunneling between optical modes of the neighboring sites. We suggest that the regime of reflectionless light propagation can be...
In this work, we predict, for the first time to our knowledge, that stable broad spatio-temporal solitons can exist in arrays of periodically curved optical waveguides, and such discrete light bullets are mobile and can move across the array. We consider propagation of light pulses in a one-dimensional array of coupled optical waveguides, where waveguide axes are periodically curved in the longitudinal...
In this work, we demonstrate a novel electro-optic platform for study of nonlinear light propagation in re-configurable periodic potentials. On the base of this platform, we predict theoretically a novel types of interface solitons existing at the interfaces between chirped and homogeneous lattices. Our platform consists of an array of close coupled waveguides in a x-cut LiNbO3 crystal, where on both...
Manipulation of light beams and pulses in nonlinear photonic lattices or waveguide arrays is attracting increasing attention, due to the potential to control spatial beam shaping combined with manipulation of temporal and spectral characteristics. In particular, photonic lattices created in a medium with quadratic nonlinearity can facilitate ultra-fast all-optical switching through parametric wave...
In this work, we study, for the first time to our knowledge, the interplay between both types of localized surface modes at the edge of a semi-infinite periodically curved waveguide array with a surface defect. We demonstrate experimentally the signature of such modes, and show that nonlinear beam self-action can provide effective control and switching between different surface states. For experimental...
The physics and applications of slow light are attracting increasing attention in recent years. Dramatic reduction of the pulse velocity by orders of magnitude was demonstrated experimentally in photonic structures with periodic modulation of refractive index. The benefits of slow-light regime include potential applications for optical delay lines and enhanced light-mater interactions. Whereas the...
We review the fundamentals of light control in nonlinear periodic photonic lattices. In particular, we demonstrate their ability to control the modulational instability and pattern formation in a nonlinear dissipative feedback system.
We predict theoretically and observe experimentally novel defect-free surface waves in truncated arrays of coupled optical waveguides with periodically bent axes, demonstrating their different properties compared to the previously studied Tamm or Shockley type states.
We study the tolerances in the phase shift between the Bragg gratings in coupled waveguides, for optimisation of power-controlled switching and slowing down of optical pulses, and cancellation of dispersion-induced pulse broadening through enhanced nonlinear self-action.
We predict theoretically and observe experimentally new regimes of polychromatic beam shaping in laser-written periodically curved two-dimensional waveguide arrays, demonstrating selective control over the strength and dimensionality of spatial diffraction for different spectral components.
We study light propagation in hexagonal waveguide arrays and show that simultaneous spatiotemporal localisation is possible by combination of engineered anomalous dispersion through selective excitation of Bloch-modes and spatial confinement in a nonlinear defect mode.
We report on the observation of nonlocal gap solitons in infiltrated photonic crystal fibres. We employ the thermal defocusing nonlinearity of the liquid to study soliton existence and effect of boundaries of the periodic structure.
We report the first observation of slow-light tunneling between coupled periodic waveguides, designed to simultaneously support two slow-light states with different phase velocities in the same frequency range. Numerical simulations agree well with experimental results.
We predict a novel type of defect-free surface waves which, in contrast to previously studied Tamm or Shockley type waves, appear in truncated but otherwise perfect arrays of coupled optical waveguides with periodically bent axes.
We report on the first experimental observation of self-collimation of white-light beams in specially designed fs laser-written curved waveguide arrays, where discrete diffraction was suppressed over the spectral range extending from blue to infrared wavelengths.
We present the first experimental observation of nonlinear beam diffusion and formation of diffraction-managed solitons in periodically-curved arrays of coupled optical waveguides created using femtosecond laser writing in silica glass, and titanium indiffusion in LiNbO3 crystals.
We suggest novel opportunities for power-controlled switching and slowing down of optical pulses in coupled waveguides with phase-shifted Bragg gratings, combined with cancellation of dispersion-induced pulse broadening through enhanced nonlinear self-action in the slow-light regime.
We predict that robust routing of slow-light pulses is possible between antisymmetrically coupled photonic-crystal waveguides. We demonstrate that for all pulses with the group velocities varying by several orders of magnitude, the complete switching occurs at the fixed coupling length of just several unit cells of the photonic crystal.
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