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  • By: Graphene Flagship
  • Graphene Flagship
  • Publishing date: 05 October 2015
  • By: Graphene Flagship
  • Graphene Flagship
  • Publishing date: 05 October 2015

Graphene teams up with two-dimensional crystals for faster data communications

Ultra-fast detection of light lies at the heart of optical communication systems nowadays. Driven by the internet of things and 5G, data communication bandwidth is growing exponentially, thus requiring even faster optical detectors that can be integrated into photonic circuits.

In the recent work published today in Nature Nanotechnology, the research group led by Prof at ICFO Frank Koppens has shown that a two-dimensional crystal, combined with graphene, has the capability to detect optical pulses with a response faster than ten picoseconds, while maintaining a high efficiency. By using ultra-fast laser pulses, the researchers have shown a record-high photo-response speed for a heterostructure made of two-dimensional materials. These new materials are gaining more and more attention due to their amazing and rich variety of properties.

An important advantage of these devices based on graphene and other two-dimensional materials is that they can be integrated monolithically with silicon photonics enabling a new class of photonic integrated circuits. Although this study has been focused on the intrinsic properties of the photo-detection device, the next step is to develop prototype photonic circuitry and explore ways to improve large-scale production of these devices.

While Prof. Frank Koppens comments "It is remarkable how a material which is just a few nanometers thick can have such high performance", ICFO researcher Mathieu Massicotte and first author of this study states that "Everyone knew graphene could make ultrafast photodetectors, but related two-dimensional crystals were still lagging very much behind. In our work we show that by teaming up these two materials, we can obtain a photodetector that is not only ultrafast but also highly efficient."

The results obtained from this study have shown that the stacking of semiconducting 2D materials with graphene in heterostructures could lead to new, fast and efficient optoelectronic applications, such as high-speed integrated communication systems.

This study has been possible thanks to the support of the Fundacio Cellex Barcelona, the European Research Council (ERC) and the European Commission under the Graphene Flagship, among others.

Reference

Picosecond photoresponse in van der Waals heterostructures
M. Massicotte, P. Schmidt, F. Vialla, K. G. Schädler, A. Reserbat-Plantey, K. Watanabe, T. Taniguchi, K. J. Tielrooij and F. H. L. Koppens
Nature Nanotechnology
Link to the paper: http://dx.doi.org/10.1038/nnano.2015.227

More information

Research group led by Prof. at ICFO Frank Koppens

Contact Information:

Frank Koppens, ICFO

Image: graphene/WSe2 (2D material)/graphene heterostructure (© ICFO-Fabien Vialla)

Author bio


Graphene Flagship
Graphene Flagship

Bringing together 118 academic and industrial partners in 12 research and innovation projects and 1 coordination and support project, the Graphene Flagship initiative will continue to advance Europe’s strategic autonomy in technologies that rely on graphene and other 2D materials. The initiative, which builds on the previous 10-years of the Graphene Flagship, is funded by the European Commission’s Horizon Europe research and innovation programme. The 2D-Experimental Pilot Line, addressing the challenges of upscaling 2D material production processes for the semiconductor industry, is another key component of the Graphene Flagship eco-system.