Enhancing optical response of graphene through stochastic resonance

Enhancing aperiodic stochastic resonance through noise modulation.

We show that the conventional stochastic resonance (SR) effect for aperiodic signals in a model neuron can be enhanced by modulating the intensity of the input noise (which could be introduced artificially in bioengineering applications) with either the input signal or the unit's output rate signal. We analyze SR enhancement theoretically and numerically. We discuss how this work provides the t...

Coherent nonlinear optical response of graphene.

We investigate the nonlinear optical properties of graphene flakes using four-wave mixing. The corresponding third-order optical susceptibility is found to be remarkably large and only weakly dependent on the wavelength in the near-infrared frequency range. The magnitude of the response is in good agreement with our calculations based on the nonlinear quantum response theory.

Stochastic resonance in atomic optical bistability

Stochastic resonance SR is experimentally demonstrated in an atomic optical bistable system consisting of three-level atoms in -type configuration confined in an optical ring cavity. The optical bistable system with enhanced Kerr nonlinearity due to atomic coherence is driven by a periodic signal and a Gaussian white noise source with variable amplitude, and displays an improved output signal-t...

Optical response and excitons in gapped graphene

Stochastic Resonance: Linear Response and Giant Nonlinearity

The response of a bistable noise-driven system to a weak periodic force is investigated using linear response theory (LRT) and by analogue electronic experiment. For quasi-thermal systems the response, and in particular its increase with increasing noise intensity D, are described by the fluctuation-dissipation relations. For small D the low-frequency susceptibility of the system χ(ω) has been ...