Geometrical representation of coherent tunneling process in two-waveguide and three-waveguide coupler

Geometrical representation of coherent tunneling process in two-waveguide and three-waveguide coupler

We propose an identical geometrical representation scheme for both Landau-Zener （LZ） tunneling process in two-waveguide coupler with a cubically bent structure and stimulated Raman adiabatic passage （STIRAP） in three-waveguide coupler, similar to the geometrical representation of sum frequency proce...

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Bibliographic Details
Published in:Chinese physics B 2017-12, Vol.26 (12), p.324-331
Main Authors: 时坚, 马瑞琼, 段作梁, 梁猛, 柴宝玉, 董军
Format: Article
Language:eng
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Summary:We propose an identical geometrical representation scheme for both Landau-Zener （LZ） tunneling process in two-waveguide coupler with a cubically bent structure and stimulated Raman adiabatic passage （STIRAP） in three-waveguide coupler, similar to the geometrical representation of sum frequency process. The results show that although the two-waveguide coupler with a cubically bent axis has not aperiodic structure, it acts as a chirped quasi-phase-matching （QPM） grating and corrects the relative phase between the two supermodes in the curved coupler system. We present a scheme about how to choose the parameters to design the curved beam splitter.
ISSN:1674-1056
2058-3834