title: Extraordinary light absorptance in graphene superlattices.
abstract: Extraordinary absorption decrease in graphene superlattices in the visible range is presented. Due to competition between loss and resonant reflection at resonance, the absorption displays non-monotonic behavior. As the period number increases above a certain critical value, absorption decreases with the increase in the period number. This is in contrast to ordinary absorption for a non-resonant condition, which monotonically increases with the period number. Moreover, this extraordinary property can also be controlled by applying a gate voltage to graphene sheets. The results provide not only a new understanding of graphene physics but also an application in nanophotonics and optoelectronics.
authors.forename: Y H
authors.initials: YH
authors.lastname: Cheng
authors.forename: C H
authors.initials: CH
authors.lastname: Chen
authors.forename: K Y
authors.initials: KY
authors.lastname: Yu
authors.forename: W J
authors.initials: WJ
authors.lastname: Hsueh