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90GHz nanopatch plasmonic antennas surpass lasers

Posted: 29 Jul 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Duke University? antenna? laser? plasmon?

As an extra bonus, the frequency of emission can be tuned to the precise telecommunications frequencies in use today by controlling the dimensions of the nano-cubes and the gap thickness of the insulating dielectric. Plus NPAs coupled to their quantum dots are much lower energy in operation than lasers, allowing photonic chips to run cooler and mobile devices to have longer battery life.

TEM image of the nanopatch plasmonic antennas

Transmission electron microscope (TEM) image of the nanopatch plasmonic antennas (NPAs, blue) coupled to their quantum dots (red). (Source: Duke University)

For the future, the researchers want to excite the plasmonic nano-antennas (which for the proof-of-concept demonstration used lasers) both optically and electrically so as to enable both the methods to thereby solve the last remaining obstacles to integrating photonics with traditional electronics. The team also hopes to more precisely place the quantum dots so as to boost the fluorescence rates to closer to the terahertz range.

Funding was provided by the Air Force Office of Scientific Research Young Investigator Programme, the Air Force Office of Scientific Research, Oak Ridge Associated University's Ralph E. Powe Junior Faculty Enhancement Award, the Lord Foundation of North Carolina, and the Intelligence Community Postdoctoral Research Fellowship Programme.

- R. Colin Johnson
??EE Times

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