Optical absorption characteristics and polarization dependence of single-layer graphene on silicon waveguide

Abstract

Graphene is attracting attention in electrical and optical research fields recently. We measured the optical absorption characteristics and polarization dependence of single-layer graphene (SLG) on submicrometer Si waveguide. The results for graphene lengths ranging from 2.5 to 200 μm reveal that the optical absorption by graphene is 0.09 dB/μm with the TE mode and 0.05 dB/μm with the TM mode. The absorption in the TE mode is 1.8 times higher than that in the TM mode. An optical spectrum, theoretical analysis and Raman spectrum indicate that surfaceplasmon polaritons in graphene support TM mode light propagation. Copyright © 2014 The Institute of Electronics, Information and Communication Engineers.