Optical Solitons in a Trinal-channel Inverted Nonlinear Photonic Crystal

Abstract

Inverted nonlinear photonic crystals are the crystals featuring competition between linear and nonlinear lattices, with minima of the linear potential coinciding with maxima of the nonlinear pseudopotential, and vice versa. Traditional inverted nonlinear photonic crystals only have two channels, and can be attained experimentally by means of Rhodamine B (RhB, a dye featuring saturable absorption) doped into the SU-8 polymer. In this paper, a new type of inverted nonlinear photonic crystal is constructed by juxtaposing three kinds of channels into a period. These three channels are a purely linear channel, a saturable self-focusing nonlinear channel, and a saturable self-defocusing nonlinear channel. This optical device is assumed to be fabricated by means of SU-8 polymer material periodically doped with two types of active dyes. The nonlinear propagation of a light field inside this device (passing along the channel) can be described by a nonlinear Schrodinger equation. Stable multi-peak fundamental and dipole solitons are found in the first gap of the system. These solitons sufficiently exhibit some interesting digital properties, which may have potential in optical communications.

References in corpus (5)

• Soliton modes, stability, and drift in optical lattices with spatially modulated nonlinearity
• Power-dependent shaping of vortex solitons in optical lattices with spatially modulated nonlinear refractive index
• Propagation of solitons in thermal media with periodic nonlinearity
• Solitons in one-dimensional photonic crystals
• Driving light pulses with light in two-level media