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Simultaneous Multi-Bit Recording and Driveless Reading for Permanent Storage in Fused Silica

2014; Volume: 9; Issue: 1 Linguagem: Inglês

10.2961/jlmn.2014.01.0001

1880-0688

Manabu Shiozawa,

Semiconductor materials and devices

A storage system using fused silica is a promising way to store historically valuable data permanently.To increase recording capacity, we studied the recording and reading conditions for a multilayer sample.The 26-layer sample, which had a recording capacity equivalent to that of a digital versatile disc (DVD), was made with a femtosecond laser and a spatial light modulator (SLM).The recording pulse energy and interlayer crosstalk were reduced by correcting spherical aberration.The sample was evaluated and read with an optical microscope.The signal-to-noise ratio (SNR) criterion of 15 dB was satisfied in all 26 layers by using signal processing.Thermal resistance at 1,000 °C for 120 minutes was demonstrated, suggesting a semi-permanent lifetime.