Using engineered nanocomposite structures called metamaterials, a City College of New York-led research team reports the ability to measure a significant increase in the energy transfer between molecules. Reported in the journal ACS Photonics, this breakthrough breaks the Förster resonance energy transfer (FRET) distance limit of ~10-20 nanometers, and leads to the possibility of measuring larger molecular assemblies.
“Energy transfer between molecules plays a central role in phenomena such as photosynthesis and is also used as a spectroscopic ruler for identifying structural changes of molecules,” said Vinod Menon, professor of physics in City College’s Division of Science. “However, the process of energy transfer is usually limited in the distance over which it occurs, typically reaching 10 to 20 nm.”
But in the study reported by Menon’s research group in ACS Photonics, the authors demonstrate significant increase in the energy transfer distance (> 15x) – reaching ~ 160 nm. This is accomplished by using a metamaterial that undergoes a topological transition.
The Menon group comprised CCNY physics majors Rahul Deshmukh and Tal Galfsky (both graduate students) and Emaad Khwaja (undergraduate). Collaborators included the theory groups of Girish Agarwal (Texas A&M University) and Svend-Age Biehs (Carl von Ossietzky University, Germany). The work at CCNY was supported by the National Science Foundation’s Division of Materials Research and the U.S. Department of Energy’s Office of Basic Energy Sciences.
Source : The City College of New York