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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

551
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,...
551

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Programmable Bloch polaritons in graphene.

Lin Xiong1, Yutao Li1, Minwoo Jung2

  • 1Department of Physics, Columbia University, New York, NY 10027, USA.

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Researchers developed a new method to control light-matter quasiparticles called surface plasmon polaritons (SPPs) using graphene. This programmable platform enables on-demand nano-optics for future photonic circuits.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Efficient control of photons is crucial for developing advanced optical devices.
  • Hybridizing light with matter creates quasi-particles that can be programmed by tuning their constituents.
  • Surface plasmon polaritons (SPPs) are promising light-matter quasi-particles for nanophotonics.

Purpose of the Study:

  • To explore a novel method for controlling SPPs in periodically modulated graphene structures.
  • To investigate the transformation of SPPs into Bloch polaritons and their unique band structures.
  • To demonstrate on-demand steering of directional Bloch polaritons using gate voltage.

Main Methods:

  • Hybridization of infrared photons with graphene Dirac electrons to form SPPs.
  • Fabrication of structures with periodically modulated carrier density in graphene.
  • Near-field imaging and Fourier analysis to characterize polariton propagation and band structure.
  • Gate voltage control to manipulate carrier density and steer polariton propagation.

Main Results:

  • Periodic modulation transforms continuous SPPs into Bloch polaritons with discrete energy bands and bandgaps.
  • Directional Bloch polaritons were successfully steered by adjusting the gate voltage.
  • The observed nano-optics functionality was confirmed to be governed by the polaritonic band structure.

Conclusions:

  • A new method for controlling SPPs in graphene using periodic structures has been demonstrated.
  • Programmable steering of Bloch polaritons offers on-demand nano-optics capabilities.
  • This platform holds significant potential for the advancement of on-the-chip photonic circuits.