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Graphene-coated microspheres

Light emitted by an optical fiber travels through the center of a glass microsphere and interacts with the graphene that coats its surface, in research carried out at the Advanced Graphene, Nanomaterials, and Nanotechnology Research Center (MackGraphe) in collaboration with the Photonics Research Center at the University of Campinas (Photonicamp). Composed of just one layer of carbon atoms, the graphene is almost transparent, allowing 98% of the light to pass through. The extent to which a graphene film disturbs light is measured to obtain an indication of its quality.

Image submitted by Kamila Tieppo, a graduate student in electrical engineering at Mackenzie Presbyterian University