title: A thermal plasmonic sensor platform: resistive heating of nanohole arrays.
abstract: We have created a simple and efficient thermal plasmonic sensor platform by letting a DC current heat plasmonic nanohole arrays. The sensor can be used to determine thermodynamic parameters in addition to monitoring molecular reactions in real-time. As an application example, we use the thermal sensor to determine the kinetics and activation energy for desorption of thiol monolayers on gold. Further, the temperature of the metal can be measured optically by the spectral shift of the bonding surface plasmon mode (0.015 nm/K). We show that this resonance shift is caused by thermal lattice expansion, which reduces the plasma frequency of the metal. The sensor is also used to determine the thin film thermal expansion coefficient through a theoretical model for the expected resonance shift.
authors.affiliation: Department of Applied Physics, Chalmers University of Technology , Göteborg, Sweden.
authors.forename: Mudassar
authors.initials: M
authors.lastname: Virk
authors.forename: Kunli
authors.initials: K
authors.lastname: Xiong
authors.forename: Mikael
authors.initials: M
authors.lastname: Svedendahl
authors.forename: Mikael
authors.initials: M
authors.lastname: Käll
authors.forename: Andreas B
authors.initials: AB
authors.lastname: Dahlin