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Broadband photodetection in a microfiber-graphene device
Optics Express
|September 26, 2015
Summary
We developed a novel microfiber-graphene device for high-performance photodetection. This hybrid device achieves excellent photocurrent responsivity across a broad telecommunication band, offering a promising solution for broadband optical sensing.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Photodetection is crucial for optical communication and sensing.
- Graphene's unique optical properties offer potential for advanced photodetectors.
- Integrating graphene with optical fibers can enhance light-matter interaction.
Purpose of the Study:
- To propose and demonstrate a novel microfiber-graphene hybrid device for photodetection.
- To investigate the photoresponse characteristics of the device.
- To assess its suitability for broadband applications.
Main Methods:
- Fabrication of a hybrid device combining a microfiber and a graphene film.
- Experimental measurement of photocurrent responsivity.
- Characterization of the photoresponse spectrum across the telecommunication band.
Main Results:
- The microfiber-graphene device exhibited a high photocurrent responsivity (~2.81 mA/W).
- A broad and nearly flat photoresponse spectrum was observed from 1500 nm to 1600 nm.
- The device leverages evanescent field interaction with graphene for enhanced performance.
Conclusions:
- The proposed device offers an effective solution for broadband photodetection.
- Graphene's dispersionless absorption contributes to the flat spectral response.
- This hybrid approach shows promise for future optical sensing technologies.
