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Azimuthal modulation of electromagnetically induced grating using structured light.

Seyyed Hossein Asadpour¹, Teodora Kirova², Jing Qian³

¹Department of Physics, Iran University of Science and Technology, Tehran, Iran.

Scientific Reports

|October 21, 2021

Summary

This summary is machine-generated.

We demonstrate a novel method for creating a 2D Electromagnetically Induced Grating using atomic systems and optical vortex beams. This technique allows for enhanced control over light diffraction patterns, transferring energy to higher orders.

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Area of Science:

Atomic, Molecular, and Optical Physics
Quantum Optics
Nonlinear Optics

Background:

Electromagnetically Induced Transparency (EIT) enables control over light propagation in atomic media.
Asymmetric diffraction gratings have applications in optical switching and signal processing.
Optical vortex beams carry orbital angular momentum and exhibit unique phase profiles.

Purpose of the Study:

To theoretically propose and investigate a scheme for generating a two-dimensional Electromagnetically Induced Grating (EIG).
To explore the influence of optical vortex beams and standing waves on the diffraction properties of a probe field.
To demonstrate the creation of an asymmetric diffraction grating without relying on parity-time symmetric structures.

Main Methods:

Theoretical modeling of a three-level atomic system interacting with probe and coupling fields.
Derivation of the Maxwell wave equation to describe probe light dynamics.
Numerical calculation of probe field amplitude, phase modulations, and Fraunhofer diffraction patterns.

Main Results:

A two-dimensional asymmetric grating is observed due to the azimuthal modulation of a Laguerre-Gaussian optical vortex beam.
The asymmetric grating enhances zeroth and high orders of diffraction, transferring probe energy.
Complete blocking of diffracted photons at specific angles is achieved due to vortex beam coupling, without PT symmetry.

Conclusions:

The proposed scheme successfully generates a 2D asymmetric EIG with tunable properties.
The interaction with optical vortex beams is crucial for inducing asymmetry and controlling diffraction.
This work offers a new pathway for designing advanced optical gratings with potential applications in photonics and quantum information processing.