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Optics Express

Controlled storage of light in silicon cavities

Ali W. Elshaari, Abdelsalam A. Aboketaf, Stefan F. Preble

Published Jan 28, 2010• 38 citations
Publisher

Abstract

We experimentally demonstrate a tunable delay element that is inherently insensitive to free-carrier loss and achieves up to 300ps of delay. It is capable of arbitrarily storing and releasing a pulse of light through dynamic tuning of a system of microcavities. The inherent storage time is more than 32 times the duration of the stored pulse.

DOI
10.1364/oe.18.003014

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We experimentally demonstrate a tunable delay element that is inherently insensitive to free-carrier loss and achieves up to 300ps of delay. It is capable of arbitrarily storing and releasing a pulse of light through dynamic tuning of a system of microcavities. The inherent storage time is more than 32 times the duration of the stored pulse.
Abstract Controlling the flow of light on-chip is of great importance for quantum computing and optical signal processing. In this paper, we present a theoretical study to reveal the underlying physics of how to effectively trap, store and release a signal pulse, and eventually break the delay-bandwidth limit, based on controllable EIT-like effect in dynamically tuned standing-wave cascaded nanocavities. Using this mechanism, we design a compact silicon photonic crystal system with long storing time and a delay-bandwidth product over 460, which is about two orders of magnitude greater than the reported results obtained by other methods based on static resonator system, and the trapped signal pulse can be released on demand.
We describe a dynamically tuned system capable of capturing light pulses incident from a waveguide in a pair of microcavities. We use coupled mode theory to design a method for determining how to tune the microcavity resonant frequencies. The results show that pulses can be captured almost completely, with arbitrarily small reflected power. We optimize the pulse capture bandwidth by varying the cavity coupling constants and show that the maximum bandwidth is comparable to the resonant-frequency tuning range. Our system may be implemented using refractive-index tuning in a 2-D silicon photonic crystal slab. Current technology would allow for capture of pulses with widths as low as ~100 ps, with a holding time limited only by cavity loss rates.
An approach to store light dynamically in slow light waveguides is proposed. First, design guidelines are developed for waveguides that allow dynamic group velocity control. Then an example of a silicon photonic crystal waveguide is presented where group velocity can be drastically reduced by applying a refractive index change of−5.5×10−2{-}{5.5}\times 10^{-2}−5.5×10−2to a specific part of the waveguide. Performing the index change while a light pulse is confined to the waveguide, we show by numerical simulations a tunable storage time of more than 70 ps for a pulse of 60 GHz bandwidth. We argue that the magnitude of the required change of the refractive index can be reduced by mode optimization.