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Metal enhanced fluorescence in nanosilver oxide for optical read write memories

A. Subrahmanyam, P. Suman Kumar and M.K. Jain
Indian Institute of Technology Madras, IN

Keywords:
optical memories, nano silver, sputtering, thin films

Abstract:
In the present work, a novel proof of concept for rewritable ultra high density nano optical data storage devices has been discussed. Nano silver films are prepared on glass substrates by DC Magnetron sputtering technique at room temperature (T=300K). When these films are oxidised at 520 K and are irradiated with blue light ( λ = 485 nm), a fluorescence emission is observed in the red region (λ ~ 650 nm) . These films are analysed by XRD and AFM. Emission spectrum was recorded using fluorometer. Films of thicknesses 50Å to 600 Å are prepared and compared the fluorescence properties. It is observed that the fluorescence emission from the silver clusters depends on growth parameters in sputtering (like substrate temperature or deposition rate) and on the oxidation temperature. The metal enhanced fluorescence (due to surface plasmon resonance phenomenon) may be used for read / write optical memories.

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