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Light tunneling inhibition and anisotropic diffraction engineering in two-dimensional waveguide arrays.

Y V Kartashov1, A Szameit, V A Vysloukh

  • 1ICFO-Institut de Ciencies Fotoniques and Universitat Politecnica de Catalunya, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain. Yaroslav.Kartashov@icfo.es

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|October 2, 2009
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Summary

We demonstrate suppressing light tunneling in two-dimensional (2D) waveguide arrays using modulated refractive indices. This method enables unique 2D optical effects like anisotropic diffraction and diffraction-free propagation.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics

Background:

  • Waveguide arrays are crucial for controlling light propagation.
  • Light tunneling between adjacent waveguides is a fundamental phenomenon.
  • Understanding and controlling tunneling is key for optical device applications.

Purpose of the Study:

  • To investigate the suppression of light tunneling in two-dimensional (2D) waveguide arrays.
  • To explore the emergence of genuine 2D optical phenomena through refractive index modulation.
  • To demonstrate anisotropic diffraction engineering and diffraction-free propagation.

Main Methods:

  • Utilizing an out-of-phase harmonic modulation of the refractive index in neighboring waveguides.
  • Analyzing light propagation dynamics in engineered 2D waveguide arrays.
  • Investigating tunneling inhibition for multichannel vortices.

Main Results:

  • Effective suppression of light tunneling was achieved at specific modulation frequencies.
  • Anisotropic diffraction engineering was demonstrated, allowing control over light spreading.
  • Diffraction-free propagation along selected directions in the transverse plane was observed.
  • Tunneling inhibition was confirmed for multichannel vortices.

Conclusions:

  • Out-of-phase harmonic modulation of refractive index is an effective method to suppress light tunneling in 2D waveguide arrays.
  • This technique enables the realization of novel 2D optical phenomena.
  • The findings have implications for designing advanced optical devices and controlling light propagation.