| Posted: Sep 12, 2017 |
Physicists observe amplification of an optical signal within cubic nonlinear nanostructures
(Nanowerk News) The coherent amplification of a localized optical signal within a planar titanium nitride nanoantenna has been achieved by scientists of Kazan Federal University (under the leadership of Sergey Kharintsev) and physicists from Harvard University, Nazarbayev University, and Imperial College London.
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The results have been recently published in Nano Letters ("Nonlinear Raman Effects Enhanced by Surface Plasmon Excitation in Planar Refractory Nanoantennas").
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| Left) A scheme of nonlinear interaction of a plasmonic pump and localized, and, as a result, Stimulated Raman Scattering occurs; (right) A plot of scattered intensity vs the pump power. (Image: Kazan Federal University)
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"The observable phenomenon is based on the nonlinear interaction of surface plasmon-polaritons and localized Stokes wave", explained Dr. Kharintsev. "Stimulated Raman (gain) emission and (loss) absorption of light are generated within a planar TiN nanoantenna exposed to a continuous laser wave with a modest power".
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According to the physicists, these results will contribute to the development of a novel area in material sciences, in which plasmonic, Raman-active, and refractory materials are studied for amplifying optical signals beyond the diffraction limit of light.
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