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Graphene-Based Infrared Position-Sensitive Detector for Precise Measurements and High-Speed Trajectory Tracking
Kaiyang Liu1, Wenhui Wang1, Yuanfang Yu1
1School of Physics and Key Laboratory of MEMS of the Ministry of Education , Southeast University , Nanjing 211189 , China.
Nano Letters
|September 27, 2019
Summary
A new graphene-Germanium photodetector offers high-resolution, fast infrared sensing for applications like motion tracking and autonomous vehicles. This noncontact optical sensor achieves excellent spatial resolution and rapid response times.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Noncontact optical sensing is crucial for advanced applications including motion tracking, autonomous vehicles, precision machining, and laser radar systems.
- Existing systems often require devices with high resolution, rapid response times, and safe operation, particularly in the infrared (IR) spectrum.
Purpose of the Study:
- To develop and demonstrate a novel near-infrared (NIR) position-sensitive detector (PSD) utilizing a graphene-Germanium (Ge) Schottky heterojunction.
- To evaluate the performance characteristics of the developed graphene-Ge PSD for high-performance optical sensing.
Main Methods:
- Fabrication of a Schottky heterojunction device using graphene and Germanium.
- Characterization of the device's optical and electrical properties, including responsivity, spatial resolution, and response time.
- Demonstration of the device's capabilities in precise angle and vibration frequency measurements, and high-speed target tracking.
Main Results:
- The graphene-Ge Schottky heterojunction PSD exhibits high responsivity with a minimum detectable power of approximately 10 nW.
- Achieved excellent spatial resolution below 1 μm and a fast response time of around microseconds (μs).
- Demonstrated successful application in precise angle measurements (∼5 × 10-6 degree), vibration frequency detection (up to 10 kHz), and trajectory tracking of high-speed targets (∼100 km/h).
Conclusions:
- The developed graphene-Ge Schottky heterojunction photodetector is a promising candidate for high-performance noncontact optical sensing systems.
- The device's broad spectral range (visible to ∼1600 nm) and robust performance metrics enable advanced applications in IR sensing.
- This work paves the way for next-generation optical sensing technologies requiring superior resolution, speed, and sensitivity.
