Observation of linear and nonlinear strongly localized modes at phase-slip defects in one-dimensional photonic lattices

Abstract

We investigate light localization at a single phase-slip defect in one-dimensional photonic lattices, both numerically and experimentally. We demonstrate the existence of various robust linear and nonlinear localized modes in lithium niobate waveguide arrays exhibiting saturable defocusing nonlinearity.

The influence of nonlinear and linear defects on the light propagation through linear one-dimensional photonic lattice

“…Defects in PL can be formed by changing the value of refractive index in certain WG or by changing the width of the WG or the distance between WGs ( (Meier et al, 2005), (Morandotti et al, 2003)). These defects destroy the translation symmetry of the system but, at the same time, they enable the existence of different stable, localized modes ( (Beličev et al, 2010), (Fedele et al, 2005), (Molina et al, 2008)). Recently, the influence of nonlinear defect (ND) on the light beam propagation in one-dimensional (1D) linear uniformed lattice has been investigated (Kuzmanović et al, 2015a) as well as the influence of linear defect (LD) and interface defect on the beam dynamics (Stojanović Krasić et al, 2016).…”

Stable Higher-Charged Vortex Solitons in Optically-Induced Lattices

“…When lights propagate in an optical lattice with a local defect, the band-gap guidance results in the formation of linear or nonlinear defect modes [32,33]. Recently, defect guiding phenomena of light in diverse settings, such as photonic crystals [13], fabricated waveguide arrays [34,35], and optically induced photonic lattices [36][37][38][39][40][41][42], have been predicted theoretically and observed experimentally. Ye and his coworkers proposed that stable nonlinear modes can be trapped in a lower-index defect sandwiched between two optical lattices, or in the cylindrical core of a radial lattice [43].…”

Nonlinear beam deflection in photonic lattices with negative defects

“…Trapping of moving solitons by linear and nonlinear defects in a one-dimensional (1D) waveguide array has been proposed as well [14]. Very recently, localized defect modes have been observed with phase defects rather than amplitude defects in photonic structures [15,16]. In applications of photonic lattices for information processing, an important task is to identify mechanisms to change the propagation direction of light beams inside the lattice network.…”