Using the interaction between light and charge fluctuations in metal nanostuctures called plasmons, a Univ. of Arkansas physicist and his collaborators 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 asst. prof. of physics, who co-authored a paper detailing the findings published in Nano Letters. The paper was co-written by Rice Univ. researchers Mark W. Knight and Douglas Natelson.

In the experiments, Herzog fabricated plasmonic nanostructures with electron beam lithography and precisely focused a laser on to a gold nanowire with a scanning optical setup.

“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.

“By varying the polarization of the light incident on the nanostructures, the plasmonic contribution of the optical heating has been determined and confirmed with computational modeling,” he said.

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.

Herzog combines his research of plasmons with his expertise in nanooptics, which is the nanoscale study of light. 

“It’s a growing field,” he said. “Nanooptics 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.”

Source: Univ. of Arkansas