Schematic of active metamaterial which shows enhanced light emission and extraction. Image by Tal Galfsky.
A City College of New York led-team has successfully demonstrated how to both enhance light emission and capture light from metamaterials embedded with light emitting nanocrystals. The breakthrough, headed by physicist Dr. Vinod Menon, could lead to a range of applications including ultrafast LEDs, nanoscale lasers and efficient single photon sources.
In the demonstration, the team used metamaterials having hyperbolic dispersion to enhance the light emission properties of the nanocrystals and simultaneously engineered an efficient light extraction scheme.
“The idea of metamaterials in the context of optics is that you can manipulate light and decide how you want it to behave in this medium,” said Professor Menon a photonics expert whose specialty includes control of light-matter interaction at the nanoscale.
While enhancement in light emission from such systems was shown by different groups, including Dr. Menon’s, in the past, they were not useful since light did not come out easily from them, making their practical application an issue. The present work alleviates this issue and takes the first step towards developing practical light emitters based on metamaterials.
“We’ve shown both an increase in light emission and were able to extract light.” added Professor Menon, whose team included City College PhD students Tal Galfsky and H.N.S. Krishnamoothy
Also part of the research team were scientists from the University of Alberta (Canada), Purdue University in Indiana. Part of the research was also carried out at the Center for Functional Nanomaterials at Brookhaven National Laboratory.
Funding was provided by the Army Research Office and the NSF MRSEC program - Center for Photonic and Multiscale Nanomaterials.
The paper appears in the latest issue of “Optica.”
About The City College of New York
Since 1847, The City College of New York has provided low-cost, high-quality education for New Yorkers in a wide variety of disciplines. More than 16,000 students pursue undergraduate and graduate degrees in: the College of Liberal Arts and Sciences; the Bernard and Anne Spitzer School of Architecture; the School of Education; the Grove School of Engineering; the Sophie Davis School of Biomedical Education, and the Colin Powell School for Civic and Global Leadership. U.S. News, Princeton Review and Forbes all rank City College among the best colleges and universities in the United States.