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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

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Polarized induced phase grating in a quantized four-level graphene monolayer system.

Seyyed Hossein Asadpour, Edris Faizabadi

|October 18, 2022

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Electromagnetically induced gratings (EIG) and phase gratings (EIPG) are demonstrated in graphene systems. Controlling coupling field polarization tunes probe light diffraction, enabling adjustable grating performance.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Area of Science:

Quantum optics
Condensed matter physics
Nanophotonics

Background:

Graphene exhibits unique optical properties due to its electronic structure.
Electromagnetically induced transparency (EIT) and related phenomena are crucial in quantum optics.
Nonlinear optical effects in low-dimensional materials are of significant research interest.

Purpose of the Study:

To investigate the formation of electromagnetically induced gratings (EIG) and electromagnetically induced phase gratings (EIPG) in a four-level quantized graphene monolayer system.
To explore the influence of coupling field polarization on the optical properties of graphene.
To analyze the diffraction characteristics of probe light modulated by these gratings.

Main Methods:

Utilizing the density matrix technique to model the four-level graphene system.
Applying perturbation theory to derive the self-Kerr nonlinear susceptibility.
Simulating the interaction of elliptically polarized coupling fields with the graphene monolayer.
Analyzing the amplitude and phase modulations of the probe light.

Main Results:

Demonstrated the feasibility of creating EIG and EIPG in a quantized graphene monolayer.
Showcased that controlling the polarization of coupling fields is key to forming these gratings.
Observed that probe light strength can switch between zeroth-order and high-order diffraction due to phase modulation.
Confirmed that grating diffraction performance is tunable via coupling light polarization.

Conclusions:

Elliptically polarized coupling fields enable the formation of EIG and EIPG in graphene.
The diffraction properties of these induced gratings are controllable through polarization tuning.
This work highlights graphene's potential for advanced optical modulation and diffraction applications.