Abstract
Backward and forward scattering of surface plasmonic wave interactions from gold nanobumps on the surface of a 30-nm gold thin film demonstrate three-dimensional (3-D) focusing and diverging properties. Fan-shaped forward scattering of an individual nanobump is observed. A quarter-circle structure composed of nanobumps is exploited to manipulate scattering from each nanobump. Experimental results show that 3-D propagation vectors generated by the gold nanobumps with their heights of 16 nm can deflect the surface plasmonic waves to produce 3-D focusing at 3.6 μm above the surface of the gold film. We clearly demonstrate that 3-D forward and backward focusing from gold nanobumps are with different amplitudes and directions of the vertical propagation vectors.
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Acknowledgments
The authors thank the National Science Council, Taiwan, for the financial support of this project under grant numbers 99-2911-I-002-127, 99-2120-M-002-012, 100-2923-M-002-007-MY3, and 100-2120-M-002-008. They also thank the Molecular Imaging Center of the National Taiwan University for technical support.
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Chang, C.M., Chu, C.H., Tseng, M.L. et al. Light Manipulation by Gold Nanobumps. Plasmonics 7, 563–569 (2012). https://doi.org/10.1007/s11468-012-9343-7
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DOI: https://doi.org/10.1007/s11468-012-9343-7