Nonlinear localized modes in PTPT-symmetric optical media with competing gain and loss

• Existence of localized modes is investigated in PT-symmetric complex potentials.
• Exact analytical expression of the localized modes is obtained.
• Effect of gain/loss profile on the stability of these localized modes is discussed.
• Localized modes in 2D and associated transverse power-flow density are also examined.

The existence and stability of the nonlinear spatial localized modes are investigated in parity-time symmetric optical media characterized by a generic complex hyperbolic refractive index distribution with competing gain and loss profile. The exact analytical expression of the localized modes are found for all values of the competing parameter and in the presence of both the self-focusing and self-defocusing Kerr nonlinearity. The effects of competing gain/loss profile on the stability structure of these localized modes are discussed with the help of linear stability analysis followed by the direct numerical simulation of the governing equation. The spatial localized modes in two-dimensional geometry as well as the transverse power-flow density associated with these localized modes are also examined.