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Tunneling inhibition for subwavelength light.

Changming Huang1, Xianling Shi, Fangwei Ye

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Physics Department, Shanghai Jiao Tong University, Shanghai, China.

Optics Letters
|August 2, 2013
PubMed
Summary

We demonstrate how to inhibit light tunneling in waveguide arrays for subwavelength light spots. Specific modulation frequencies prevent light leakage, enabling undistorted propagation and improved localization with nonlinearity.

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Area of Science:

  • Photonics and Waveguide Optics
  • Nonlinear Optics
  • Metamaterials

Background:

  • Light tunneling in waveguide arrays is crucial for optical signal processing.
  • Subwavelength light propagation presents challenges due to diffraction and scattering.
  • Dynamical modulation of refractive index offers novel control over light propagation.

Purpose of the Study:

  • To investigate the inhibition of light tunneling for subwavelength light spots in dynamically modulated waveguide arrays.
  • To explore the conditions and mechanisms for achieving undistorted propagation of subwavelength light.
  • To analyze the role of nonlinearity and material composition (dielectric and metallic) in this phenomenon.

Main Methods:

  • Theoretical analysis of light propagation in modulated waveguide arrays.

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  • Numerical simulations of subwavelength light spot dynamics.
  • Investigation of parameter space including modulation frequency, waveguide separation, and nonlinearity.

    • Main Results:

    • Light tunneling inhibition achieved for subwavelength light spots in dynamically modulated waveguide arrays.
    • Undistorted propagation over hundreds of Rayleigh lengths demonstrated for specific modulation frequencies.
    • Tunneling inhibition effectiveness dependent on waveguide separation exceeding a critical threshold.
    • Weak focusing nonlinearity enhances light localization.

    Conclusions:

    • Dynamically modulated waveguide arrays offer a viable method for controlling light tunneling at the subwavelength scale.
    • The phenomenon provides a pathway for robust propagation of subwavelength light features.
    • The findings are relevant for designing advanced photonic devices and manipulating light at the nanoscale.