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Localized Light Focusing and Super Resolution Readout via Chalcogenide Thin Film

Published online by Cambridge University Press:  01 February 2011

Junji Tominaga
Affiliation:
j-tominaga@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Japan, N/A, 305-8562, Japan
Paul Fons
Affiliation:
paul-fons@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Tsukuba, N/A, 305-8562, Japan
Takayuki Shima
Affiliation:
t-shima@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Tsukuba, N/A, 305-8562, Japan
Kazuma Kurihara
Affiliation:
k.kurihara@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Tsukuba, N/A, 305-8562, Japan
Takashi Nakano
Affiliation:
t-nakano@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Tsukuba, N/A, 305-8562, Japan
Alexander Kolobov
Affiliation:
a.kolobov@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Tsukuba, N/A, 305-8562, Japan
Stephane Petit
Affiliation:
stephane.petit@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Tsukuba, N/A, 305-8562, Japan
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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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

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