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Localized Light Focusing and Super Resolution Readout via Chalcogenide Thin Film

  • Junji Tominaga (a1), Paul Fons (a2), Takayuki Shima (a3), Kazuma Kurihara (a4), Takashi Nakano (a5), Alexander Kolobov (a6) and Stephane Petit (a7)...

Abstract

We have demonstrated that certain chalcogenide layers within a spinning super-RENS optical disc allow to squeeze the 650 nm laser beam to a spot size as fine as 50 nm using a 15-nm chalcogenide film. The near-field light was focused at a depth of just over 30 nm after passing through a chalcogenide film. Finite-difference time-domain (FDTD) simulations also reproduced these results. We suggest that a conductive ring aperture generated in the chalcogenide layers plays an important role in the localized light focusing.

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