Sagnac interferometry and self-Kerr nonlinearity dependent photon drag

Quantum Optics and Quantum Information Research Group, Department of Physics, University of Malakand Chakdara Dir (L), 18800, Khyber Pakhtunkhwa, Pakistan

^(a) E-mail: Sana7175@gmail.com (corresponding author)

Received: 28 May 2023
Accepted: 25 July 2023

Abstract

We present a theoretical investigation of the photon drag by incorporating self-Kerr nonlinearity (SKN) in a Sagnac interferometer featuring a four-level atomic system. By introducing SKN in the system, we demonstrate significant improvements in the photon drag angles, ranging from ±10 micro-radians to ±1 centi-radians. Additionally, the presence of SKN leads to electromagnetically induced transparency (EIT), reduced group velocities, and a positive group index enhancement within the system. Conversely, in the absence of SKN, a negative group index is observed, accompanied by larger group velocities and minimal photon drag angles. The results obtained may have potential applications in various fields, such as slow-light detection, controlled image coding/design, efficient light modulators, and phase-matching in Brillouin scattering.