Tunable nonlinear PT-symmetric defect modes with an atomic cell

TL;DR

This paper introduces a method to create a tunable, highly nonlinear, PT-symmetric defect in a 1D photonic crystal using an atomic cell with isotopes, enabling stable nonlinear defect modes.

Contribution

It presents a novel scheme for engineering tunable nonlinear PT-symmetric defects with atomic cells in photonic crystals, allowing control over defect modes.

Findings

PT-symmetric defect can be achieved with atomic cells.

Stable nonlinear defect modes can be formed.

The defect's properties are tunable via control fields.

Abstract

We propose a scheme of creating a tunable highly nonlinear defect in a one-dimensional photonic crystal. The defect consists of an atomic cell filled in with two isotopes of three-level atoms. The probe-field refractive index of the defect can be made parity-time (PT) symmetric, which is achieved by proper combination of a control field and of Stark shifts induced by a far-off-resonance field. In the PT-symmetric system families of stable nonlinear defect modes can be formed by the probe field.