Quantum mechanics

Voltage

Photodetector

Particle physics

Computer science

Diode

Photonics

Transistor

Physics

Optics

Image (mathematics)

Resonance (particle physics)

Artificial intelligence

Subthreshold conduction

Noise (video)

Light-emitting diode

Optoelectronics

Stochastic resonance

Nature Communications

In this article, we adopt a radical approach for next generation ultra-low-power sensor design by embracing the evolutionary success of animals with extraordinary sensory information processing capabilities that allow them to survive in extreme and resource constrained environments. Stochastic resonance (SR) is one of those astounding phenomena, where noise, which is considered detrimental for electronic circuits and communication systems, plays a constructive role in the detection of weak signals. Here, we show SR in a photodetector based on monolayer MoS 2 for detecting ultra-low-intensity subthreshold optical signals from a distant light emitting diode (LED). We demonstrate that weak periodic LED signals, which are otherwise undetectable, can be detected by a MoS 2 photodetector in the presence of a finite and optimum amount of white Gaussian noise at a frugal energy expenditure of few tens of nano-Joules. The concept of SR is generic in nature and can be extended beyond photodetector to any other sensors.

Stochastic resonance in MoS2 photodetector