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Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor.

Yuxiang Tang1, Yanbin Zhang2, Qirui Liu1

  • 1College of Advanced Interdisciplinary Studies, National University of Defense Technology, 410073, Changsha, China.

Light, Science & Applications
|April 15, 2022
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We discovered plasmon-exciton polaritons (plexcitons) in silver-tungsten disulfide systems exhibit giant room-temperature nonlinearity. This strong interaction enables efficient ultrafast all-optical switching and information processing.

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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Materials science

Background:

  • Developing materials with strong optical nonlinearities is crucial for quantum and nonlinear optics.
  • Polaritons, as light-matter quasiparticles, offer potential for achieving significant nonlinear responses.

Purpose of the Study:

  • To explore plasmon-exciton polaritons (plexcitons) in a hybrid silver nanodisk and tungsten disulfide system.
  • To investigate the origin of their giant room-temperature nonlinearity and its potential applications.

Main Methods:

  • Fabrication of a hybrid system with silver nanodisk arrays and monolayer tungsten disulfide (WS2).
  • Comprehensive ultrafast pump-probe spectroscopy to analyze nonlinear optical properties.

Main Results:

  • Plexcitons in the hybrid system exhibit giant room-temperature nonlinearity.
  • Nonlinearity is dominated by saturation and higher-order excitation-induced dephasing, differing from traditional polaritons.
  • Demonstrated manipulation of ultrafast nonlinear absorption properties.

Conclusions:

  • Plexcitons possess intrinsically strong interactions, paving the way for novel optical functionalities.
  • This research opens new avenues for energy-efficient ultrafast all-optical switching and information processing.