Coherent signal amplification in bistable nanomechanical oscillators by stochastic resonance

Badzey, Robert L.; Mohanty, Pritiraj

doi:10.1038/nature04124

Cited by 277 publications

(187 citation statements)

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“…Noise is generally considered a harmful contribution in usual circumstances. Stochastic resonance (SR) is an intriguing effect allowing one to enhance coherently the response of a nonlinear process by the addition of a noisy perturbation [1]. Synergetic interplay between a feeble input periodic signal and the stochastic perturbation allows us to amplify coherently the response of a nonlinear system.…”

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confidence: 99%

Stochastic Resonance in Collective Exciton-Polariton Excitations inside a GaAs Microcavity

et al. 2014

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We report the first observation of stochastic resonance in confined exciton polaritons. We evidence this phenomena by tracking the polaritons behavior through two stochastic resonance quantifiers namely the spectral magnification factor and the signal-to-noise ratio. The evolution of the stochastic resonance in the function of the modulation amplitude of the periodic excitation signal is studied. Our experimental observations are well reproduced by numerical simulations performed in the framework of the GrossPitaevskii equation under stochastic perturbation.

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confidence: 99%

Stochastic Resonance in Collective Exciton-Polariton Excitations inside a GaAs Microcavity

et al. 2014

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“…PACS numbers: 85.85.+j, 62.30.+d, 62.40.+i, Micro and nanomechanical devices are under intense investigation for both their promising instrumental applications and their implication in fundamental issues of physics. These devices are ultra-sensitive mass [1] and force detectors [2], they can be used in their linear [3] or nonlinear regimes [4] to implement various signal processing schemes [5,6]. In a more fundamental realm, they can be thought of as probes for non-newtonian deviations to gravity at small scales [7], for refined studies of the Casimir force [8], and for the study of quantum fluids [9].…”

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confidence: 99%

Evidence for the Role of Normal-State Electrons in Nanoelectromechanical Damping Mechanisms at Very Low Temperatures

et al. 2013

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We report on experiments performed at low temperatures on aluminum covered silicon nanoelectromechanical resonators. The substantial difference observed between the mechanical dissipation in the normal and superconducting states measured within the same device unambiguously demonstrates the importance of normal-state electrons in the damping mechanism. The dissipative component becomes vanishingly small at very low temperatures in the superconducting state, leading to exceptional values for the quality factor of such small silicon structures. A critical discussion is given within the framework of the standard tunneling model. PACS numbers: 85.85.+j, 62.30.+d, 62.40.+i, Micro and nanomechanical devices are under intense investigation for both their promising instrumental applications and their implication in fundamental issues of physics. These devices are ultra-sensitive mass [1] and force detectors [2], they can be used in their linear [3] or nonlinear regimes [4] to implement various signal processing schemes [5,6]. In a more fundamental realm, they can be thought of as probes for non-newtonian deviations to gravity at small scales [7], for refined studies of the Casimir force [8], and for the study of quantum fluids [9]. Moreover, nanoresonators themselves cooled to their quantum ground state tackle problems that have been around quantum mechanics since the early beginning, with the possibility of controlling a mechanical collective macroscopic degree of freedom at the quantum level [10][11][12][13].Having high quality devices is desirable in many of these fields. However, it is well known that the quality factor Q of mechanical structures becomes worse as their size is reduced [14], while internal stresses have been found to drastically increase the Q in silicon-nitride nanobeams [15]. Although it is clear that the surfaceto-volume ratio is a key ingredient for the understanding of mechanical dissipation, a proper theoretical explanation covering all experiments remains elusive [16][17][18][19]. Nanomechanical friction mechanisms thus deserve to be understood from both an engineering and a fundamental condensed matter physics point of view.Almost all nanoresonators used in dissipation experiments possess a metallic coating used to actuate and detect the motion. This layer has an essential impact on the mechanical properties, since it adds mass and surface stresses which significantly modify the dissipation characteristics [16,20]. Most experiments are performed with normal conducting metals; only little is known about superconductor-covered nanodevices [13,21,22].Addressing dissipation mechanisms requires a broad temperature range to be explored, within the Kelvin and sub-Kelvin range. Common features are observed: the dissipation follows a power law T n below a certain temperature T * , with a crossover to a rather flat high temperature region that depends on the nature and size of the object. The resonance frequency shifts logarithmically at the lowest temperatures, and reveals a maximum around the same cr...

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“…Biomagnetic emotional contagion signals appears to propagate between crowd members by biomagnetic resonance being amplified by stochastic resonance using ambient noise; [199] it was proposed that stochastic resonance could amplify communication in neural networks "Because the electric field interacts with neurons even at magnitudes insufficient to trigger action potentials, it provides a means to introduce a sub-threshold signal into an entire network of neurons to probe for Stochastic Resonation" [200].…”

Section: Oscillation and Synchronisationmentioning

confidence: 99%

The Sixth Sense-Emotional Contagion; Review of Biophysical Mechanisms Influencing Information Transfer in Groups

McDonnell¹

2014

JBBS

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Rioting historically has been known to cause changes in individual cognition, with heightened emotionality, increased excitement and reduced reflective thought. A cross-disciplinary literature review hypothesises emotional states generate corresponding metabolic bio magnetic fields that radiate in patterns reflecting these emotional states. The oscillatory phase of these waves is advanced as being more significant than the power of signal, permitting stochastic effects to magnify signals by appropriating ambient noise. Possible transmission and detection structures in the body are discussed, induced paramagnetic sensitivity in crowd participants in a phase transition process is hypothesised, the effect may be proportional to crowd numbers. It is suspected that positive effects seen in Transcranial Magnetic Therapy used to treat depression may be operating on this mechanism, acting on natural receptors in the limbic system which also capture light and are implicated in mood transitions. A number of paramagnetic neurotransmitters may be implicated.

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Coherent signal amplification in bistable nanomechanical oscillators by stochastic resonance

Abstract: The conditions for a system to exhibit stochastic resonance are well known and fairly robust. First among these is an energy threshold. Second, there needs to be an

Cited by 277 publications

References 20 publications

Stochastic Resonance in Collective Exciton-Polariton Excitations inside a GaAs Microcavity

Stochastic Resonance in Collective Exciton-Polariton Excitations inside a GaAs Microcavity

Evidence for the Role of Normal-State Electrons in Nanoelectromechanical Damping Mechanisms at Very Low Temperatures

The Sixth Sense-Emotional Contagion; Review of Biophysical Mechanisms Influencing Information Transfer in Groups

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