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Optical bistability in a nonlinear-shell-coated metallic nanoparticle.

Hongli Chen1,2, Youming Zhang2, Baile Zhang2,3

  • 1College of Physics, Optoelectronics and Energy of Soochow University, &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.

Scientific Reports
|February 25, 2016
PubMed
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Metallic nanoparticles with nonlinear shells show optical bistability, controllable by shell geometry and incident light. Optimized designs offer broader bistable regions and lower thresholds for optical devices.

Area of Science:

  • Nanophotonics
  • Nonlinear Optics
  • Materials Science

Background:

  • Optical bistability is crucial for advanced optical devices.
  • Metallic nanoparticles with nonlinear shells are promising candidates for such applications.
  • Understanding the influence of structural parameters on optical bistability is essential.

Purpose of the Study:

  • To investigate the optical bistability of nonlinear shell-coated metallic nanoparticles using Mie scattering theory.
  • To explore the dependence of optical bistability on nanoparticle geometry and incident light conditions.
  • To identify optimal designs for enhanced optical bistability.

Main Methods:

  • A self-consistent mean field approximation was employed within Mie scattering theory.
  • The study analyzed the effect of varying shell size, metallic core volume fraction, and incident wavelength.

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  • An optimization process was used to find design parameters for improved bistability.

    • Main Results:

    • Optical bistability was demonstrated in nonlinear shell-coated metallic nanoparticles across a wide intensity range.
    • Bistability was found to be highly sensitive to the nanoparticle's geometry, particularly the core volume fraction.
    • The incident wavelength significantly impacts the observed optical bistability.
    • An optimized design was identified, featuring a broader bistable region and a lower threshold field.

    Conclusions:

    • Nonlinear shell-coated metallic nanoparticles exhibit tunable optical bistability.
    • Geometric parameters and incident wavelength are critical for controlling bistability.
    • Optimized designs hold potential for developing efficient all-optical switching and memory devices.