We report the results of systematic studies of plasmonic and photonic guided modes in large-area single-layer graphene integrated into a nanostructured silicon substrate. The interaction of light with graphene and substrate photonic crystals can be classified in distinct regimes depending on the relation of the photonic crystal lattice constant and the relevant modal wavelengths, that is, plasmonic, photonic, and free-space. By optimizing the design of the substrate, these resonant modes can increase the absorption of graphene in the infrared, facilitating enhanced performance of modulators, filters, sensors, and photodetectors utilizing silicon photonic platforms.
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© 2015 American Chemical Society.
- absorption enhancement
- graphene absorption
- graphene plasmonic response
- infrared response
- silicon photonics