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Graphene-Based Optoelectronic Mixer Device for Time-of-Flight Distance Measurements for Enhanced 3D Imaging
Paul Kienitz1, Andreas Bablich1, Rainer Bornemann1
1Department of Electrical Engineering and Computer Science, University of Siegen, Hölderlinstrasse 3, 57076 Siegen, Germany.
Nano Letters
|June 16, 2023
Summary
Graphene photodetectors enable 3D sensing through optoelectronic frequency mixing. This technology achieved 1m distance detection with high signal-to-noise ratios and accuracy, paving the way for advanced 3D imaging sensors.
Area of Science:
- Optoelectronics
- Materials Science
- Sensor Technology
Background:
- 3D image sensors are crucial for numerous applications.
- Graphene's nonlinear optoelectronic properties offer potential for novel sensing functionalities.
Purpose of the Study:
- To demonstrate 3D sensing capabilities using graphene photodetectors.
- To explore the use of intrinsic optoelectronic frequency mixing for distance measurement.
Main Methods:
- Utilized graphene photodetectors exhibiting nonlinear output characteristics.
- Implemented intrinsic optoelectronic frequency mixing for sensing.
- Performed proof-of-principle distance measurement experiments.
Main Results:
- Achieved modulation frequencies of 3.1 MHz.
- Obtained signal-to-noise ratios of approximately 40 dB.
- Demonstrated distance detection up to 1 meter with a mean accuracy of 25.6 mm.
- The More than Moore approach enabled near 100% geometrical fill factors.
Conclusions:
- Graphene photodetectors can perform 3D sensing via optoelectronic frequency mixing.
- The developed approach is scalable and integrates with CMOS electronics.
- This technology offers a promising path for advanced 3D imaging and sensing solutions.
