Eur. Phys. J. B (2012) 85: 127
https://doi.org/10.1140/epjb/e2012-30039-9

Regular Article

Entropic bona fide stochastic resonance with periodic modulation

¹ Faculty of Science, Kunming University of Science and Technology, 650093 Kunming, P.R. China
² Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology, 650093 Kunming, P.R. China

^a e-mail: zchh2009@126.com

Received: 15 January 2012
Received in final form: 16 February 2012
Published online: 18 April 2012

Abstract

In this paper, we study the stochastic resonance (SR) in a geometrically confined system, where the irregular boundaries yield entropic barriers. When the boundaries are subjected to periodic modulation, the output signal-to-noise ratio (SNR) is calculated. The effects of the noise strength, the strength of the transversal force, the frequency and strength of modulation of the walls of the enclosure are discussed. Our results show that: (i) it is interesting to observe a resonance peak in the SNR as a function of the frequency of modulation, and therefore to the appearance of the entropic bona fide SR phenomenon; and (ii) the resonance peak is more pronounced with decreasing strength of the transversal force and increasing strength of modulation.