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Stochastic resonance in finite arrays of bistable elements with local coupling

Opened Access Stochastic resonance in finite arrays of bistable elements with local coupling
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Autor: Morillo Buzón, Manuel
Gómez-Ordóñez, José
Casado Vázquez, José Manuel
Casado Pascual, Jesús
Cubero, David
Departamento: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. Departamento de Física Aplicada I
Fecha: 2009
Publicado en: European Physical Journal B: Condensed Matter and Complex Systems, 69(1), 59-64
Tipo de documento: Artículo
Resumen: In this article, we investigate the stochastic resonance (SR) effect in a finite array of noisy bistable systems with nearest-neighbor coupling driven by a weak time-periodic driving force. The array is characterized by a collective variable. By means of numerical simulations, the signal-to-noise ratio (SNR) and the gain are estimated as functions of the noise and the interaction coupling strength. A strong enhancement of the SR phenomenon for this collective variable in comparison with SR in single unit bistable systems is observed. Gains larger than unity are obtained for some parameter values and multi-frequency driving forces, indicating that the system is operating in a non-linear regime albeit the smallness of the driving amplitude. The large SNR values observed are basically due to the fact that the output fluctuations are small and short lived, in comparison with their typical values in a linear regime. A non-monotonic behavior of the SNR with the coupling strength is also obt...
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