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Bloch-Zener oscillations in binary superlattices.

F Dreisow1, A Szameit, M Heinrich

  • 1Institute of Applied Physics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743 Jena, Germany. f.dreisow@uni-jena.de

Physical Review Letters
|March 5, 2009
PubMed
Summary

Bloch-Zener oscillations were observed in laser-written waveguides. This coherent superposition of Bloch oscillations and Zener tunneling leads to unique wave dynamics and reconstruction.

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Area of Science:

  • Nonlinear optics
  • Quantum dynamics
  • Waveguide optics

Background:

  • Bloch oscillations describe particle movement in periodic potentials.
  • Zener tunneling involves transitions between energy bands.
  • Minibands arise in periodic structures like superlattices.

Purpose of the Study:

  • To experimentally demonstrate Bloch-Zener oscillations in a novel system.
  • To investigate the coherent superposition of Bloch oscillations and Zener tunneling.
  • To visualize unique wave dynamics in engineered optical lattices.

Main Methods:

  • Utilizing femtosecond laser-written waveguide arrays to create curved binary lattices.
  • Guiding light waves through these engineered optical structures.
  • Observing and analyzing the resulting wave propagation patterns.

Main Results:

  • Experimental evidence of Bloch-Zener oscillations in light waves.
  • Visualization of double-periodicity breathing and oscillation modes.
  • Demonstration of synchronous tunneling leading to wave reconstruction.

Conclusions:

  • Bloch-Zener oscillations are achievable in curved waveguide arrays.
  • The study reveals novel coherent dynamics in optical systems.
  • Wave reconstruction via synchronous tunneling is a key observation.