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Journal of Physics B Atomic Molecular and Optical Physics

Photonic transport via chirped adiabatic passage in optical waveguides

Stefano Longhi

Published Jun 5, 2007• 25 citations
Publisher

Abstract

We propose a novel transport scheme for light waves in a triple-well optical system which mimics the technique of Raman chirped adiabatic passage (RCAP) for population transfer in three-level atomic or molecular systems driven by linearly chirped laser pulses. The optical analogue of atomic RCAP is realized using three tunnelling-coupled and cubically bent optical waveguides, and enables an almost complete light transfer between the outer waveguides with negligible excitation of the middle waveguide.

DOI
10.1088/0953-4075/40/12/f01

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We propose a novel transport scheme for light waves in a triple-well optical system which mimics the technique of Raman chirped adiabatic passage (RCAP) for population transfer in three-level atomic or molecular systems driven by linearly chirped laser pulses. The optical analogue of atomic RCAP is realized using three tunnelling-coupled and cubically bent optical waveguides, and enables an almost complete light transfer between the outer waveguides with negligible excitation of the middle waveguide.
We report on an experimental demonstration of light transfer in an engineered triple-well optical waveguide structure which provides a classic analog of coherent tunneling by adiabatic passage (CTAP) recently proposed for coherent transport in space of neutral atoms or electrons among tunneling-coupled optical traps or quantum wells [A. D. Greentree et al., Phys. Rev. B 70, 235317 (2004); K. Eckert et al., Phys. Rev. A 70, 023606 (2004)]. The direct visualization of CTAP wave-packet dynamics enabled by our simple optical system clearly shows that in the counterintuitive passage scheme light waves tunnel between the two outer wells without appreciable excitation of the middle well.
Abstract This study demonstrates complete adiabatic population transfer in a closed three-level atomic system using chirped laser pulses. By satisfying the three-photon resonance condition, we effectively mitigate the first-order Doppler effect. Under the assumption of weak coupling between the stable levels, we show that relative phase fluctuations of the lasers exert a negligible influence on the population dynamics during the transfer process. A comprehensive analysis of the system parameters is conducted to determine the optimal conditions for achieving 100% population transfer while minimizing the excited state population
We propose an adiabatic method for the robust transfer of light between the two outer waveguides in a three-waveguide directional coupler. Unlike the established technique inherited from stimulated Raman adiabatic passage (STIRAP), the method proposed here is symmetric with respect to an exchange of the left and right waveguides in the structure and permits the transfer in both directions. The technique uses the adiabatic elimination of the middle waveguide together with level crossing and adiabatic passage in an effective two-state system involving only the external waveguides. It requires a strong detuning between the outer and the middle waveguide and does not rely on the adiabatic transfer state (dark state) underlying the STIRAP process. The suggested technique is generalized to an array of NNN waveguides and verified by numerical beam propagation calculations.
Classical wave optical analogs of coherent population transfer via a continuum, recently demonstrated for laser-driven atoms and molecules in the atomic physics context, are theoretically proposed for light waves propagating in waveguide-based photonic structures. In particular, it is shown that exploitation of the optical analogs of two-photon Rabi oscillations and stimulated Raman adiabatic passage via continuous states enables efficient transfer of light waves between two channel optical waveguides side coupled to a slab waveguide.