Abstract
In this paper, we seek to demonstrate spatial near field light confinement with a truly sub-wavelength resolution in the visible range. For that purpose, an opaque metallic screen is pierced with an array of rectangular nano-apertures which support polarization sensitive guided modes. We show that it is possible to switch on and off sub-wavelength apertures about only 200 nanometers away. Theoretical results have been performed (3D-FDTD home-made code) and are in good agreement with the experimental results. These kinds of nano-structures might offer a convenient and versatile way to sub-wavelength light addressing, optical trapping, molecular, or nano-probing, non-linear spectroscopy.
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Acknowledgements
This work is partially supported by the Government of Senegal which supply A. Ndao’s research grant and by the U.F.R. Sciences and Techniques of the University of Franche-Comté which earmark funds. The authors would like to thank Roland Salut from the platform of technology, MIMENTO at FEMTO-ST, for greatly helping with the fabrication process.
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Ndao, A., Vagne, Q., Salvi, J. et al. Polarization sensitive sub-wavelength metallic structures: toward near-field light confinement control. Appl. Phys. B 106, 857–862 (2012). https://doi.org/10.1007/s00340-011-4835-2
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DOI: https://doi.org/10.1007/s00340-011-4835-2