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Universal ultrafast detector for short optical pulses based on graphene
Optics Express
|November 13, 2015
Summary
This study introduces a novel graphene detector for ultrafast detection across a broad spectrum. The device achieves a 40-picosecond rise time, enabling efficient signal capture from visible to far-infrared wavelengths.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Graphene possesses unique optical and electronic properties suitable for advanced detection applications.
- Ultrafast detection requires materials with rapid response times and broad spectral sensitivity.
Purpose of the Study:
- To develop and characterize a graphene-based detector for broadband ultrafast detection.
- To evaluate the detector's performance across a wide spectral range, from visible to far-infrared.
Main Methods:
- Fabrication of a large-area graphene active region with interdigitated electrodes.
- Integration of a log-periodic antenna for enhanced long-wavelength collection efficiency.
- Utilizing a silicon carbide substrate transparent in the visible spectrum.
Main Results:
- Achieved a 40-picosecond electrical rise time.
- Demonstrated broadband detection spanning nearly three orders of magnitude in wavelength (780 nm to 500 µm).
- Exhibited a noise-equivalent power of approximately 100 µW·Hz(-½).
Conclusions:
- The graphene-based detector is a promising active material for broadband ultrafast detection.
- The device design effectively enhances spectral range and collection efficiency.
- The detector's performance validates its utility in diverse optical and electronic applications.
