title: How to optically count graphene layers.
abstract: The total thickness of a graphene sample depends upon the number of individually stacked graphene layers. The corresponding surface plasmon resonance (SPR) reflectance alters the SPR angle, depending on the number of graphene layers. Thus, the correlation between the SPR angle shift and the number of graphene layers allows for a nonintrusive, real-time, and reliable counting of graphene layers. A single-layer graphene (SLG) is synthesized by means of chemical vapor deposition, followed by physical transfer to a thin gold film (48 nm) repeatedly, so that multilayer graphene samples with one, three, and five layers can be prepared. Both the measured SPR angles and the entire reflectance curve profiles successfully distinguish the number of graphene layers.
authors.affiliation: World Class University Program, Seoul National University, Seoul, South Korea.
authors.forename: Sosan
authors.initials: S
authors.lastname: Cheon
authors.forename: Kenneth David
authors.initials: KD
authors.lastname: Kihm
authors.forename: Jae Sung
authors.initials: JS
authors.lastname: Park
authors.forename: Joon Sik
authors.initials: JS
authors.lastname: Lee
authors.forename: Byeong Jun
authors.initials: BJ
authors.lastname: Lee
authors.forename: Hyeoungkeun
authors.initials: H
authors.lastname: Kim
authors.forename: Byung Hee
authors.initials: BH
authors.lastname: Hong