Journal
NANO LETTERS
Volume 11, Issue 2, Pages 893-897Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl104333n
Keywords
Plasmon; symmetry breaking; plasmonic corral; scanning near-field optical microscopy; finite-difference time domain
Categories
Funding
- National Basic Research Program of China (973 Program) [2007CB936800]
- National Natural Science Foundation of China [10574002]
- Robert A. Welch Foundation [C-1222]
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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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