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Real-Space Mapping of Hole Plasmons
Real-Space Mapping of Hole Plasmons
Bulletin of the Korean Chemical Society. 2014. Mar, 35(3): 953-954
Copyright © 2014, Korea Chemical Society
  • Received : September 25, 2013
  • Accepted : October 08, 2013
  • Published : March 20, 2014
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Deok-Soo Kim
Zee Hwan Kim

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Experimental
The Au-hole with a diameter of 200 nm is made by the simple nanosphere-lithography: polystyrene beads of a corresponding diameter are dispersed onto the Si-wafer, and is coated with an Au film of thickness of 50 nm by thermal evaporation coating, and the bead is removed by sonicating in dichloromethane (CH 2 Cl 2 ). This procedure yields randomly distributed nano-holes with a well-defined diameter. To minimize the tip-induced perturbation (shift in resonance frequency and distortion of the recorded field) in sSNOM, 5 we use weakly scattering Si-tip (tapping mode), and use the cross-polarization geometry in which excitation light is polarized orthogonal to the tip-axis ( s -polarized) and only the scattered light that is polarized near-parallel to the tipaxis ( p -polarized) is detected.
Acknowledgements
The authors acknowledge the financial support (Grant Nos. 2013-028021, 2012-0008686, and 2013-004512) from the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST). This work was also supported by Research Resettlement Fund for the new faculty of SNU. This paper is dedicated to Professor Myung Soo Kim on the occasion of his honorable retirement.
References
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