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Nano-sized electronic circuit promises bright view of early universe
Date:7/10/2008

n an upcoming issue of the journal Nature Nanotechnology. The journal's website posted an electronic copy of the paper this week at: http://dx.doi.org/10.1038/nnano.2008.173. The team is led by Gershenson and Boris Karasik of the Jet Propulsion Laboratory (JPL), a NASA center managed by the California Institute of Technology (CalTech). Most of the fabrication and measurement work was done at Rutgers by graduate student Jian Wei, now a post-doctoral associate at the Northwestern University; postdoctoral researcher David Olaya, now with the National Institute of Standards and Technology; and postdoctoral researcher Sergey Pereverzev, now with JPL and CalTech. The theoretical support for this research was provided by Andrei Sergeev of the State University of New York at Buffalo.

Made of titanium and niobium metals, the novel device is about 500 nanometers long and 100 nanometers wide. The physicists built it using thin-film and nanolithography techniques similar to those used in computer chip fabrication. The device operates at very cold temperatures about 459 degrees below zero Fahrenheit, or one-tenth of one degree above absolute zero on the Kelvin scale.

Photons striking the nanodetector heat electrons in the titanium section, which is thermally isolated from the environment by superconducting niobium leads. By detecting the infinitesimal amount of heat generated in the titanium section, one can measure the light energy absorbed by the detector. The device can detect as little as a single photon of far infrared light.

"With this single detector, we have demonstrated a proof of concept," said Gershenson. "The final goal is to build and test an array of 100 by 100 photodetectors, which is a very difficult engineering job." Rutgers took the lead on fabrication and electrical characterization of the single detector, and JPL will take the lead on the optical characterization of the
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Contact: Carl Blesch
cblesch@ur.rutgers.edu
732-932-7084 x616
Rutgers University
Source:Eurekalert  

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