Jan. 21, 2014 — Using the interaction between light and charge fluctuations in metal nanostuctures called plasmons, physicist have demonstrated the capability of measuring temperature changes in very small 3-D regions of space.
Plasmons can be thought of as waves of electrons in a metal surface, said Joseph B. Herzog, visiting assistant professor of physics at the University of Arkansas, who co-authored a paper detailing the findings that was published Jan. 1 by the journal Nano Letters, a publication of the American Chemical Society.
The paper, titled "Thermoplasmonics: Quantifying Plasmonic Heating in Single Nanowires," was co-written by Rice University researchers Mark W. Knight and Douglas Natelson.
"This work measures the change in electrical resistance of a single gold nanowire while it is illuminated with light," Herzog said. "The change in resistance is related to the temperature change of the nanowire. Being able to measure temperature changes at small nanoscale volumes can be difficult, and determining what portion of this temperature change is due to plasmons can be even more challenging.
Herzog's publication is in a rapidly growing, specialized area called thermoplasmonics, a sub-field of plasmonics that studies the effects of heat due to plasmons and has been used in applications ranging from cancer treatment to solar energy harvesting.
"It's a growing field," he said. "Nano-optics and plasmonics allow you to focus light into smaller regions that are below the diffraction limit of light. A plasmonic nanostructure is like an optical antenna. The plasmon-light interaction makes plasmonics fascinating."
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