Rewrite Characteristics of a Scattered-Type Superresolution Near-Field Structure Optical Disk with a Ag2O Mask Layer

スポンサーリンク

概要

• 論文の詳細を見る

• On the basis of the working mechanism of a silver-oxide-type superresolution near-field structure (super-RENS) disk, we realized excellent rewriting by performing the following steps: (1) initialize the disk at a continuous power of $P_{\text{i}}=8.0$ mW for 3 s, (2) write at a pulsed power of $P_{\text{w}}=8.0--9.0$ mW, (3) read (reinitialize only the mask layer) at a superresolution power of $P_{\text{sr}}=5.5$ mW, which lies between the powers under reversible conditions of $P_{\text{i}}{}^{\text{l}}=4.5$ mW and $P_{\text{i}}{}^{\text{u}}=6.0$ mW for the mask layer, (4) erase at a continuous power of $P_{\text{e}}=7.5$ mW for 3 s, and (4) rewrite at a pulsed power of $P_{\text{w}}=8.0--9.0$ mW. The carrier-to-noise ratio (CNR) difference between writing and erasing slightly varies for successive rewritings, resulting in $\mathrm{CNR}=23$ dB after 20 rewrite operations for a mark length of 400 nm, which is less than the resolution limit $\lambda/4\mathrm{NA}=413$ nm. The Ag2O mask layer is decomposed into Ag nanoparticles at 160 °C that aggregate to form nanoclusters dispersed in the mask layer after the initialization operation at $P_{\text{i}}=8.0$ mW (3 s), and the recording layer made of Ge2Sb2Te5 (GST) is transformed by a second phase transition from a rocksalt crystal structure of fcc to a hexagonal crystal structure (the phase transition temperature range is estimated to be 250–450 °C) at a pulsed power of $P_{\text{w}}=8.0--9.0$ mW, and vice versa at a continuous power of $P_{\text{e}}=7.5$ mW for a disk velocity of 2 m/s.

• 2007-09-15

著者

• Ukita Hiroo

  Faculty Of Science And Engineering Ritsumeikan University

• Tamura Naoyoshi

  Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan

• Ukita Hiroo

  Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan

関連論文

• Read/Write Mechanism for a Scattered Type Super-Resolution Near-Field Structure Using an AgOx Mask Layer and the Smallest Mark Reproduced
• Near Field Observation of a Refractive Index Grating and a Topographical Grating by an Optically-Trapped Gold Particle
• Micromechanical Photonics
• Finite-Difference Time-Domain Analysis of Refractive Index Grating on Planar Light Waveguide Circuit with Optically Trapped Gold Particles
• A Wavelength and Spectrum Measurement of an Extremely-Short-External-Cavity Laser Diode by Precisely Controlling Slider Flying Height
• Resolving Discrepancy between Theoretical and Experimental Optical Trapping Forces Using Effects of Beam Waist and Trapping Position Displacement due to Gravity
• Theoretical Demonstration of a Newly Designed Micro-Rotator Driven by Optical Pressure on a Light Incident Surface
• Visualization and Analysis of a Micro-Flow Generated by an Optical Rotator
• Rotation Rate of a Three-Wing Rotor Illuminated by Upward-Directed Focused Beam in Optical Tweezers
• Rewrite Characteristics of a Scattered-Type Superresolution Near-Field Structure Optical Disk with a Ag2O Mask Layer

スポンサーリンク