Readout characteristics and mechanism of light-scattering-mode super-RENS disks

Junji Tominaga; Dorothea Buechel; Takashi Nakano; Hiroshi Fuji; Toshio Fukaya; Nobufumi Atoda

doi:10.1117/12.390493

6 July 2000 Readout characteristics and mechanism of light-scattering-mode super-RENS disks

Junji Tominaga, Dorothea Buechel, Takashi Nakano, Hiroshi Fuji, Toshio Fukaya, Nobufumi Atoda

Proceedings Volume 4081, Optical Storage and Optical Information Processing; (2000) https://doi.org/10.1117/12.390493
Event: Photonics Taiwan, 2000, Taipei, Taiwan

Abstract

Readout characteristics of light-scattering-mode super- resolution near-field structure (super-RENS) disks are described in detail. Readout intensities in reflected and transmitted signals are compared. Both signals showed mostly the same carrier-to-noise ratios (CNRs) using objective lenses with NA of 0.6. The formation mechanism of light scattering centers in the super-RENS disks ia also described in comparison with several different disks. As increasing oxygen ratio during the deposition of silver oxide (AgOx) layers, two different chemical reactions were identified. It was found that the super-RENS disks with oxygen-rich AgOx films have both characteristics of transparent and light- scattering apertures in one disk. Further study also revealed that the AgOx dynamic nonlinearity is not so high and less than 6% by the film itself; however, it is enhanced to 12% in super-RENS. It is supposed that the imaginary refractive index k of the films is less than 0.1; therefore, it is hard to heat itself to the decomposition temperature without a heat source (GeSbTe film) underneath. This result would be a hint to further increase CNRs in a light- scattering-mode super-RENS disks.

Citation Download Citation

Junji Tominaga, Dorothea Buechel, Takashi Nakano, Hiroshi Fuji, Toshio Fukaya, and Nobufumi Atoda "Readout characteristics and mechanism of light-scattering-mode super-RENS disks", Proc. SPIE 4081, Optical Storage and Optical Information Processing, (6 July 2000); https://doi.org/10.1117/12.390493

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