Polarization sensitive sub-wavelength metallic structures: toward near-field light confinement control
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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.
KeywordsTE01 Mode Cutoff Wavelength Rectangular Aperture Light Confinement Experimental Transmission Spectrum
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.