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Phys Rev Lett. 2010 Apr 9;104(14):147401. Epub 2010 Apr 7.

Plasmon-induced magneto-optical activity in nanosized gold disks.

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  • 1Research Center on Nanoscience and Nanotechnology-CIN2 (CSIC) and CIBER-BBN, 08196 Bellaterra, Spain.


In this Letter we show that nanostructures made out of pure noble metals can exhibit measurable magneto-optic activity at low magnetic fields. This phenomenon occurs when the localized surface plasmon resonance of the nanostructure is excited in the presence of a static magnetic field parallel to the propagation of incident light. The large magneto-optical response observed comes from an increase of the magnetic Lorentz force induced by the large collective movement of the conduction electrons in the nanostructures when the resonance is excited.

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