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Physical Review A

Cavity-soliton motion in the presence of device defects

E. Caboche, S. Barland, M. Giudici, Jorge R. Tredicce, G. Tissoni, L. A. Lugiato

Published Nov 10, 2009• 25 citations
Publisher

Abstract

Cavity solitons (CSs) are localized structures appearing as single intensity peaks in the homogeneous background of the field emitted by a nonlinear (micro) resonator driven by a coherent field (holding beam). By introducing a phase gradient in the holding beam, it is possible to induce CS drift. This motion is strongly influenced by the presence of defects in the device structure. We analyze numerically two situations that appeared in the experiments. In the first one, a structure is self-generated on the defect and a regular sequence of moving CS originates from it. We investigate the properties of this ``tap'' of CS as a function of the defect characteristics and of the parameters values. The second situation corresponds to the interaction between a moving CS and a defect, which plays a fundamental role in CS applications such as the delay line or the shift register.

DOI
10.1103/physreva.80.053814

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Cavity solitons (CSs) are localized structures appearing as single intensity peaks in the homogeneous background of the field emitted by a nonlinear (micro) resonator driven by a coherent field (holding beam). By introducing a phase gradient in the holding beam, it is possible to induce CS drift. This motion is strongly influenced by the presence of defects in the device structure. We analyze numerically two situations that appeared in the experiments. In the first one, a structure is self-generated on the defect and a regular sequence of moving CS originates from it. We investigate the properties of this ``tap'' of CS as a function of the defect characteristics and of the parameters values. The second situation corresponds to the interaction between a moving CS and a defect, which plays a fundamental role in CS applications such as the delay line or the shift register.
In this communication, the authors investigate numerically and analytically the influence of delayed feedback on the mobility properties of 2D cavity solitons. The authors consider a passive cavity filled with a two-level medium and driven by a coherent injection beam. The authors report on a new type of instability leading to a spontaneous drift of dissipative solitons. The authors show that when the product of the delay time and the feedback amplitude exceeds a certain threshold, a single circularly symmetric localized structure starts to move in an arbitrary direction.
Temporal cavity solitons (TCSs) are optical pulses that persist inside coherently driven passive Kerr resonators [1]. Since their discovery, TCSs have been suggested as bits for all-optical buffers due to their flexibility [2]: they can be individually addressed, erased and moved around at will. To that end, a reliable method is required to move, position, and trap TCSs to precise locations. So far a successful method to achieve this has been to use a phase modulation of the driving field in space [3] or time [4]. Here, we demonstrate that TCS trapping and manipulation can also be achieved by inducing intensity gradients on the background field.
We employ an alternative control of diffraction based on the generation of slow-light dissipative solitons for a three-level medium in a cavity pumped by two quasi-resonant fields. Complex self-organised structures and spatial localization of light due to the interaction of diffraction and nonlinearity in optical cavities have important applications in optics and photonics, ranging from digital optical memories to delay lines. Note that conservative Raman solitons with slow-light have been observed in free propagation in a planar CS2waveguide by using the localization of a pump field.
Clouds of cold neutral atoms driven by a coherent light beam in a ring cavity exhibit self-structured states transversely with respect to the beam axis due to optomechanical forces and the backaction of the atomic structures on the beam. Below the instability threshold for extended hexagonal structures, localized solitonlike excitations can be stable. These constitute peaks or holes of atom density, depending on the linear susceptibility of the cloud. Complex rotating and spiraling motion of coupled atom-light solitons, and, hence, atomic transport, can be achieved via phase gradients in the input field profile. We also discuss the stability of rotating soliton chains in view of soliton-soliton interactions. The investigations are performed in a cavity scheme but expected to apply to other longitudinally pumped schemes with diffractive coupling.
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Cavity solitons in ring resonators have revolutionized frequency comb generation and its applications. Coexistence of bright and dark cavity solitons in these devices is, in general, associated with vectorial configurations with more than one optical field resonated in the cavity. We demonstrate the coexistence of stable bright, stable dark, and stable hybrid bright-dark cavity solitons in a single resonated field device formed by a three-level medium in a micro-resonator with normal dispersion. Each of these solitons displays unusually wide regions of stability and a multitude of secondary localized structures, including families of soliton crystals leading to an unprecedented variety of possible frequency combs in a single photonic device. Of the many possible soliton crystals, the most striking is a periodic sequence of dark cavity solitons found at huge distances from the stability region of the single dark soliton.