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arXiv:1304.7013 · Applied Physics Letters

Elementary array of Fabry-Pérot waveguide resonators with tunable coupling

Guillaume Lepert, E. A. Hinds, Helen L. Rogers, James C. Gates, Peter G. R. Smith

Published Sep 9, 2013• 6 citations
arXivHTMLPDF

Abstract

We recently proposed that an array of optical cavities containing quantum emitters could be interconnected by an optical bus made of Fabry Pérot resonators lying side by side, for applications in quantum information processing and quantum simulation. Here, we demonstrate the feasibility of this geometry. We show that the resonators can be conveniently coupled, and that the coupling rate between adjacent waveguides can be widely tuned using the thermo-optic effect. The device is linearly scalable and can be combined with other integrated devices, making it more generally applicable as an adjustable optical delay line or optical interconnect.

DOI
10.1063/1.4820915

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We recently proposed that an array of optical cavities containing quantum emitters could be interconnected by an optical bus made of Fabry Pérot resonators lying side by side, for applications in quantum information processing and quantum simulation. Here, we demonstrate the feasibility of this geometry. We show that the resonators can be conveniently coupled, and that the coupling rate between adjacent waveguides can be widely tuned using the thermo-optic effect. The device is linearly scalable and can be combined with other integrated devices, making it more generally applicable as an adjustable optical delay line or optical interconnect.
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Optical Fabry-Pérot resonators are traditionally formed by spherical mirrors. However, we have shown that by allowing for more general mirror shapes, the eigenmodes of a resonator can be designed and optimised for specific applications, e.g., for maximised coupling to a quantum emitter for quantum information processing. We discuss the general concepts, the numerical methods for optimising the mirror shapes, and the main results of our simulations. For example, we find that in plano-concave resonators the cooperativity can be enhanced by one order of magnitude. Finally, we compare the theoretically optimum solutions with those obtained for more easily manufacturable mirror shapes.
We analyze the transmission of light through coupled-resonator optical waveguides in the form of evanescently coupled Fabry-Perot resonator arrays. We develop a transfer matrix method to calculate the amplitude and phase responses of the arrays. We also discuss the inclusion of optical gain in the system to compensate for losses in these structures. Owing to the compact length along the propagation direction in evanescently coupled arrays, large slowing factors of the order of 102-103 can be achieved even with a weak index contrast of ∼0.1%. The large slowing factor, coupled with weak index contrast, makes this structure a promising candidate for artificial slow light system.