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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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Twisted Two-Dimensional Material Stacks for Polarization Optics.

Kaveh Khaliji1, Luis Martín-Moreno2,3, Phaedon Avouris1,4

  • 1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.

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|May 27, 2022
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Summary
This summary is machine-generated.

We demonstrate a tunable optical element using stacked van der Waals materials. This device precisely controls light polarization for advanced optical applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Precise control of light polarization is crucial for modern optical technologies.
  • Existing methods for polarization control often lack tunability or versatility.

Purpose of the Study:

  • To propose and analyze a novel optical element based on stacked anisotropic van der Waals materials.
  • To demonstrate the capability of this element to achieve diverse Jones matrices and polarization transformations.

Main Methods:

  • Theoretical modeling of a twisted stack of anisotropic van der Waals materials.
  • Analysis of electrostatic control for tuning optical properties.
  • Investigation of Jones matrices for various classes (unitary, Hermitian, singular, etc.).

Main Results:

  • The proposed twisted stack can act as an arbitrary-birefringent wave-plate or polarizer with tunable non-normality.
  • Access to a variety of polarization transformers, including rotators and pseudorotators.
  • An electrostatic-reconfigurable stack demonstrates tunable operation as four distinct polarizers for Stokes polarimetry.

Conclusions:

  • Stacked anisotropic van der Waals materials offer a versatile platform for creating reconfigurable polarization optical elements.
  • This approach enables advanced polarization control for applications in information processing, telecommunications, and spectroscopy.