Temperature mapping near plasmonic nanostructures using fluorescence polarization anisotropy.
We report on a thermal imaging technique based on fluorescence polarization anisotropy measurements, which enables mapping the local temperature near nanometer-sized heat sources with 300 nm spatial resolution and a typical accuracy of 0.1 degrees C. The principle is demonstrated by mapping the temperature landscape around plasmonic nano-structures heated by near-infrared light. By assessing directly the molecules' Brownian dynamics, it is shown that fluorescence polarization anisotropy is a robust and reliable method which overcomes the limitations of previous thermal imaging techniques. It opens new perspectives in medicine, nanoelectronics and nanofluidics where a control of temperature of a few degrees at the nanoscale is required.
Baffou
G
G
ICFO - Institut de Ciencies Fotoniques, 08860 Castelldefels (Barcelona), Spain. guillaume.baffou@icfo.es
Kreuzer
M P
MP
Kulzer
F
F
Quidant
R
R