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Nano Lett. 2011 Feb 9;11(2):893-7. doi: 10.1021/nl104333n. Epub 2010 Dec 27.

Plasmonic focusing in symmetry broken nanocorrals.

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  • 1School of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing, China.


Plasmonic focusing was investigated in symmetry broken nanocorrals under linearly polarized illumination. Near-field optical measurements of the perpendicular electric field show that a single subwavelength spot size of 320 nm can be generated. The interference pattern within the corral can be controlled by changing the polarization of optical excitation and the degree of symmetry breaking. The intensity enhancement factor was investigated using finite-difference time-domain simulations and confirmed by analytical calculations taking into account the plasmon damping and multiple reflections against the corral wall.

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