Microcavity-Integrated Graphene Photodetector

By Marco M. Furchi, A. Urich, A. Pospischil, G. Lilley, K. Unterrainer, H. Detz, P. Klang, A. Andrews, W. Schrenk, G. Strasser and 1 more. Nano letters (Print), 2011

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There is an increasing interest in using graphene1,2 for optoelectronic applications.3−19 However, because graphene is an inherently weak optical absorber (only ≈2.3% absorption), novel concepts need to be developed to increase the absorption and take full advantage of its unique optical properties. We demonstrate that by monolithically integrating graphene with a Fabry-Pérot microcavity, the optical absorption is 26-fold enhanced, reaching values >60%. We present a graphene-based microcavity photodetector with responsivity of 21 mA/W. Our approach can be applied to a variety of other graphene devices, such as electro-absorption modulators, variable optical attenuators, or light emitters, and provides a new route to graphene photonics with the potential for applications in communications, security, sensing and spectroscopy.

Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/04cce31a85f600e690207eee2b5bafc334352dea

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Strong Light-Matter Interactions in Heterostructures of Atomically Thin Films (2013, background): “One possible way—the use of optical resonators (35)—is already partly realized in our devices on SiO2, where light interference in SiO2 layer (36, 37) enhances the optical electric field in TMDC (this is one of the reasons for better performance of our devices on SiO2 in comparison with those on fle”