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Optical transition process in AgOx super-resolution near-field structure.
1Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China.
Journal of Microscopy
|March 19, 2003
Summary
This study investigated the nonlinear optical properties of a silver oxide (AgOx) thin film for super-resolution near-field optical disks. Researchers found a reversible optical switching window, crucial for high-density data storage applications.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Super-resolution near-field optical disks require advanced materials for high-density data storage.
- Silver oxide (AgOx) thin films are promising candidates due to their unique optical properties.
Purpose of the Study:
- To characterize the nonlinear optical properties of a sandwiched AgOx thin film.
- To determine the optical response and threshold intensities for potential disk applications.
Main Methods:
- Utilized a confocal Z-scan system with a Q-switched Nd:YAG pulse laser (532 nm).
- Measured transmittance and reflectance of a quartz glass/ZnS-SiO2/AgOx/ZnS-SiO2 thin film structure.
- Analyzed optical responses at varying input laser powers.
Main Results:
- Observed significant optical responses of the AgOx film at the Z-scan focal point.
- Identified correlations between AgOx dissociation, silver-oxygen recombination, and localized surface plasmon resonance with optical properties.
- Determined an irreversible upper threshold intensity of 4.40 x 10^6 mW/cm^2.
- Established a reversible working intensity window between 1.86 x 10^6 and 4.40 x 10^6 mW/cm^2 for the AgOx film.
Conclusions:
- The AgOx thin film exhibits reversible optical switching behavior within a specific intensity range.
- These findings support the potential of AgOx films for super-resolution near-field optical disk technology.
- Understanding near-field interactions is key for optimizing disk performance.