Localization of optical pulses in guided wave structures with only fourth order dispersion

Publication date: Available online 19 August 2019Source: Physics Letters AAuthor(s): Wesley B. CardosoAbstractInspired by the recent realization of pure-quartic solitons [Nat. Commun. 7 (2016) 10427], in the present work we study the localization of optical pulses in a similar system, i.e., a silicon photonic crystal air-suspended structure with a hexagonal lattice. The propagation of ultrashort pulses in such a system is well described by a generalized nonlinear Schrödinger (NLS) equation, which in certain conditions works with near-zero group-velocity dispersion and third order dispersion. In this case, the NLS equation has only the fourth order dispersion term. In the present model, we introduce a quasiperiodic linear coefficient that is responsible to induce the localization. The existence of Anderson localization has been confirmed by numerical simulations even when the system presents a small defocusing nonlinearity.

Source: Physics Letters A - August 20, 2019 Category: Physics Source Type: research