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Bloch-wave packet control in truncated modulated optical lattices
Yaroslav V Kartashov1, Victor A Vysloukh, Lluis Torner
1ICFO-Institut de Ciencies Fotoniques and Universitat Politecnica de Catalunya, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain. Yaroslav.Kartashov@icfo.es
Optics Letters
|December 18, 2010
Summary
We investigated Bloch wave packet reflection in optical lattices. Complete beam reflection is achievable by tuning modulation frequency and depth, inhibiting light tunneling.
Area of Science:
- Nonlinear optics
- Wave propagation in periodic structures
- Photonic lattices
Background:
- Optical lattices are crucial for controlling light propagation.
- Understanding wave reflection at interfaces is fundamental in optics.
- Refractive index modulation influences light tunneling and localization.
Purpose of the Study:
- To investigate the reflection of Bloch wave packets at the interface of a modulated optical lattice.
- To demonstrate control over transmitted and reflected energy flows.
- To identify conditions for complete beam reflection.
Main Methods:
- Theoretical study of Bloch wave packet dynamics.
- Analysis of light reflection and transmission at the lattice interface.
- Numerical simulations of wave propagation in modulated optical lattices.
Main Results:
- The ratio of transmitted to reflected energy flow is controllable via modulation frequency and depth.
- Complete beam reflection occurs at specific resonant modulation frequencies.
- Light tunneling between adjacent waveguides is inhibited at these resonant frequencies.
Conclusions:
- Shallow longitudinal out-of-phase refractive index modulation offers efficient control over wave reflection.
- Resonant frequencies provide a mechanism for achieving total reflection in optical lattices.
- This control mechanism has potential applications in optical switching and beam steering.
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