Controllable large positive and negative Goos-Hänchen shifts with a double-Lambda atomic system.

Area of Science:

• Quantum optics
• Atomic physics
• Photonics

Background:

• The Goos-Hänchen shift (GHS) describes the transverse displacement of a light beam upon reflection.
• Controlling GHS is crucial for developing advanced optical devices.
• Atomic media offer unique properties for manipulating light-matter interactions.

Purpose of the Study:

• To investigate the Goos-Hänchen shift (GHS) in a cavity with a double-Lambda atomic medium.
• To explore the controllability of GHS using both coherent and incoherent fields.
• To identify conditions for achieving large GHS amplitudes.

Main Methods:

• Theoretical analysis of light reflection from a bounded atomic medium.
• Modeling the optical response of a double-Lambda system under coherent and incoherent fields.
• Investigating the dependence of GHS on incidence angle and system parameters.

Main Results:

• Demonstrated positive and negative controllability of GHS by applying coherent and incoherent fields.
• Observed large GHS amplitudes, on the order of the incident light's wavelength.
• Identified multiple angles of incidence and a wide range of atomic medium parameters that yield significant GHS.

Conclusions:

• The proposed system allows for significant control over the Goos-Hänchen shift.
• Large, controllable GHS can be achieved in double-Lambda atomic systems, opening avenues for optical sensing and manipulation.
• The findings have implications for the design of novel photonic devices.