A Thermal Plasmonic Sensor Platform: Resistive Heating of Nanohole Arrays
Artikel i vetenskaplig tidskrift, 2014

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.

gold

nanohole

Plasmon

thermal expansion

current

temperature

Författare

Mudassar Mumtaz Virk

Chalmers, Teknisk fysik, Kemisk fysik

Kunli Xiong

Chalmers, Teknisk fysik, Bionanofotonik

Mikael Svedendahl

Chalmers, Teknisk fysik, Bionanofotonik

Mikael Käll

Chalmers, Teknisk fysik, Bionanofotonik

Andreas Dahlin

Chalmers, Teknisk fysik, Bionanofotonik

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 14 3544-3549

Ämneskategorier

Nanoteknik

DOI

10.1021/nl5011542