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Stochastic resonance in MoS2 photodetector.
Akhil Dodda1, Aaryan Oberoi1, Amritanand Sebastian1
1Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA, 16802, USA.
Nature Communications
|September 4, 2020
Summary
This study demonstrates stochastic resonance (SR) in a molybdenum disulfide (MoS2) photodetector. This noise-assisted sensing technique enables ultra-low-power detection of weak optical signals, crucial for next-generation sensors.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Animals utilize sophisticated sensory processing for survival in extreme environments.
- Stochastic resonance (SR) is a phenomenon where noise enhances weak signal detection, contrary to conventional electronic principles.
Purpose of the Study:
- To investigate stochastic resonance in a molybdenum disulfide (MoS2) photodetector.
- To demonstrate ultra-low-power detection of subthreshold optical signals using SR.
Main Methods:
- Fabrication of a photodetector using monolayer MoS2.
- Application of white Gaussian noise to the MoS2 photodetector.
- Detection of weak, periodic optical signals from a light-emitting diode (LED).
Main Results:
- Successful demonstration of stochastic resonance in the MoS2 photodetector.
- Detection of otherwise undetectable weak LED signals with optimal noise levels.
- Achieved frugal energy expenditure in the tens of nano-Joules.
Conclusions:
- Stochastic resonance offers a viable strategy for ultra-low-power sensor design.
- The MoS2 photodetector effectively utilizes SR for weak optical signal detection.
- The SR concept is broadly applicable to various sensor types beyond photodetectors.
