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Using a grating with a grade, engineers trap a rainbow
Date:6/27/2008

g structure could help scientists and engineers reduce the size of optical structures so they can be integrated at the nanoscale with electronic devices.

"Our grating structure can also be scaled to telecommunications frequencies for future possible applications in integrated optical and nano-photonic circuits," he says.

"This might even help us realize such novel applications as a spectrometer integrated on a chip for chemical diagnostics, spectroscopy and signal processing applications."

Gan, who holds an M.S. in electrical engineering from the Chinese Academy of Sciences in Beijing and a B.S. in materials science and engineering from Fudan University in Shanghai, has used computer modeling to develop and test the grating structure. He will begin soon to work with Ding to conduct physical experiments. Ding has made significant progress in generating THz radiation.

It was after reading an article by another researcher in the field that Gan and Fu came up with the idea of developing graded grating structures to trap and slow light waves.

"The other researcher was attempting to use a cylindrical structure to focus light waves into a subwavelength scale for a THz scanning microscope," he says. "We simplified the cylinder to a grating structure and realized that incoming light waves would be trapped at various points across the grade."


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Contact: Kurt Pfitzer
kap4@lehigh.edu
610-758-3017
Lehigh University
Source:Eurekalert

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