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Dynamically Tunable and Multifunctional Polarization Beam Splitters Based on Graphene Metasurfaces.

Gongli Xiao1, Sitong Zhou1, Hongyan Yang2

  • 1Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China.

Nanomaterials (Basel, Switzerland)
|September 9, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a tunable graphene metasurface that acts as a multifunctional polarization beam splitter. It demonstrates dynamic electro-optical switching and polarization sensitivity for advanced optical devices.

Keywords:
graphenemetamaterialsplasmon-induced transparencypolarization beam splitterpolarization-sensitive

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Area of Science:

  • Optoelectronics
  • Metamaterials
  • Nanotechnology

Background:

  • Graphene metasurfaces offer unique optical properties.
  • Dynamically tunable devices are crucial for advanced photonic applications.
  • Plasma-induced transparency (PIT) enables novel optical functionalities.

Purpose of the Study:

  • To propose and analyze a multifunctional, dynamically tunable polarization beam splitter based on a graphene metasurface.
  • To investigate the electro-optical switching modulation and polarization sensitivity of the proposed device.
  • To explore the combination of PIT and polarization sensitivity for versatile optical device development.

Main Methods:

  • Coupled-mode theory (CMT) for theoretical analysis.
  • Finite-difference time-domain (FDTD) approach for numerical simulations.
  • Graphene metasurface design with specific strip and block configurations.

Main Results:

  • Achieved triple plasma-induced transparency (PIT).
  • Demonstrated synchronous or asynchronous six-mode electro-optical switching modulation with a maximum modulation degree of amplitude (MDA) of 97.6% at 5.148 THz.
  • Realized a polarization-sensitive, tunable polarization beam splitter (PBS) with an extinction ratio of 19.6 dB and insertion loss of 0.35 dB at 6.143 THz, and a frequency modulation degree of 25.2%.

Conclusions:

  • The proposed graphene metasurface enables multifunctional and tunable polarization beam splitting.
  • Combining PIT with polarization sensitivity offers a viable platform for advanced optical devices.
  • Dynamic electro-optical control of optical properties is achieved by tuning graphene's Fermi levels.