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Europhysics Letters (EPL)

Stopping and manipulating light using a short array of active microresonators

Yannick Dumeige

Published Apr 1, 2009• 17 citations
Publisher

Abstract

We theoretically propose a light-stopping process that uses loss and gain dynamical tuning in short coupled-resonator delay lines. The structure is made of four resonators and is optimized to avoid pulse distortion in the passive regime. The loss and gain modulations allow the resonant structure to be isolated from the access waveguide and the pulse to be stored. We demonstrate via numerical simulations the pulse storing process and show that this active delay line also induces nonlinear effects leading to pulse compression. This last property could be useful for pulse dispersion tailoring.

DOI
10.1209/0295-5075/86/14003

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We theoretically propose a light-stopping process that uses loss and gain dynamical tuning in short coupled-resonator delay lines. The structure is made of four resonators and is optimized to avoid pulse distortion in the passive regime. The loss and gain modulations allow the resonant structure to be isolated from the access waveguide and the pulse to be stored. We demonstrate via numerical simulations the pulse storing process and show that this active delay line also induces nonlinear effects leading to pulse compression. This last property could be useful for pulse dispersion tailoring.
We theoretically analyze the light-storing process in optical microresonator arrays. We propose a passive and an active schemes to strongly slow light. The two mechanisms rely on microresonator chains whose high order dispersion is optimized. The unit cell of the systems is a short sequence of two or four resonators. In the passive process we show that the cancellation of the third order of dispersion allows the propagation of short pulses with no significant distortion in a microresonator array. The second process needs the use of active microresonators whose loss and gain are dynamically tuned. The structure is made of only four resonators and is optimized to avoid pulse distortion as it is the case in the passive scheme. The loss and gain modulations allow the resonant structure to be isolated from the access waveguide and optical pulse to be stored.
Dynamic tuning of systems of microresonators coupled to waveguides allows a rich range of physical effects. Periodic resonator arrays can be tuned to stop and store light pulses, theoretically allowing for tunable delay devices in which the delay is limited neither by bandwidth nor by dispersion. For two-resonator systems, adjustable delays can be obtained from tuning a narrow transparency resonance. Similar behavior is also predicted in a quite different physical system, that of a single photon interacting with dynamically-tuned quantum bits.
We present a theoretical analysis of light propagation in one-dimensional resonant photonic bandgap structures (RPBGs). The analysis is aimed at evaluating the feasibility of controlled stopping, storing, and releasing of light pulses by parametric manipulation of the RPBG's bandstructure. First we lay the conceptual foundation of light-pulse delay by means of band structure control in infinite RPBGs, and then we contrast the idealized concepts with numerical results for realistic, finite-sized RPBGs. For a physical model for RPBGs, we use semiconductor quantum-well Bragg structures, but the general analysis is valid for a wider class of RPBG. We show that the usefulness of RPBGs for optical delay lines depends critically on the number of quantum wells and the dephasing and loss mechanisms in each unit cell of the RPBG, and we also outline optimization strategies in terms of spectral light characteristics as well as quasi-antireflection coating of the RPBGs.