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Journal of International Crisis and Risk Communication Research

Experimental Observation of Rabi oscillations in a one-dimensional photonic lattice

K. V. Shandarova, C. E. Rüter, Rong Dong, Detlef Kip, Konstantinos G. Makris, Demetrios N. Christodoulides, Or Peleg, Mordechai Segev

Published May 4, 2008• 1 citation
Publisher

Abstract

We observe Rabi oscillations in one-dimensional waveguide arrays. Adiabatic transitions, both direct and indirect (phonon-assisted), between extended Floquet-Bloch modes associated with different bands are stimulated by index-gratings inducing periodic modulations along the propagation direction. © 2007 Optical Society of America.
DOI
10.1109/qels.2008.4552958

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We demonstrate spatial Rabi oscillations in optical waveguide arrays. Adiabatic transitions between extended Floquet-Bloch modes associated with different bands are stimulated by periodic modulation of the photonic lattice in the propagation direction. When the stimulating modulation also carries transverse momentum, the transition becomes indirect, equivalent to phonon-assisted Rabi oscillations. In solid state physics such indirect Rabi oscillations necessitate coherent phonons and hence they have never been observed. Our experiments suggest that phonon-assisted Rabi oscillations are observable also with Bose-Einstein condensates, as well as with other wave systems-where coherence can be maintained for at least one period of the Rabi oscillation.
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A light pulse propagating in a suddenly switched-on photonic lattice, when the central frequency lies in the photonic bandgap, is an analog of the Rabi model, where the two-level system is the two resonant (i.e., Bragg-coupled) Fourier modes of the pulse, while the photonic lattice serves as a monochromatic external field. A simple theory of this Rabi oscillations is given and confirmed by the numerical solution of the corresponding Maxwell equations. This is a direct, i.e., temporal analog of the Rabi effect, additionally to the spatial analog in optical beam propagation described previously [Opt. Lett.32, 1920 (2007)]. An additional high-frequency modulation of the Rabi oscillations reflects the lattice-induced energy transfer between the electric and magnetic fields of the pulse.
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