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Topological phase singularities in atomically thin high-refractive-index materials.

Georgy Ermolaev1, Kirill Voronin1, Denis G Baranov1

  • 1Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia.

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|April 20, 2022
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Atomically thin transition metal dichalcogenides (TMDCs) enable advanced photonic devices. Combining TMDCs with Fabry-Perot resonators creates topological phase singularities for enhanced optical modulation and sensing applications.

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Area of Science:

  • Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Atomically thin transition metal dichalcogenides (TMDCs) offer unique excitonic properties for photonic applications.
  • The atomic thickness of 2D materials limits their optical phase delay, necessitating advanced optical designs for sensing and modulation.
  • Fabry-Perot resonators integrated with 2D semiconductors can enhance optical functionalities.

Purpose of the Study:

  • To engineer optical phase singularities in reflection using 2D semiconductors and Fabry-Perot resonators.
  • To demonstrate the ubiquitous nature of topological phase singularities in various high-refractive-index materials, including TMDCs.
  • To develop a highly sensitive refractive index sensor based on PdSe2 topological phase singularities.

Main Methods:

  • Combining films of 2D semiconductors with excitonic lines with SiO2/Si substrates forming Fabry-Perot resonators.
  • Investigating topological phase singularities in reflection spectra around specific spectral features.
  • Utilizing PdSe2 topological phase singularities for refractive index sensing.

Main Results:

  • Topological phase singularities were successfully realized in reflection spectra of TMDC-based structures.
  • These singularities exhibit rapid phase changes and enable perfect absorption.
  • The developed PdSe2 sensor demonstrated superior phase sensitivity compared to surface plasmon resonance sensors.

Conclusions:

  • Topological phase singularities are a powerful tool for phase engineering in flat optics, applicable to a broad class of 2D materials.
  • The integration of TMDCs with Fabry-Perot resonators offers a versatile platform for advanced photonic devices.
  • The demonstrated refractive index sensor highlights the practical potential of topological phase singularities in sensing applications.