Journal
OPTICS EXPRESS
Volume 24, Issue 20, Pages 23557-23565Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.023557
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Funding
- National Natural Science Foundation of China [61675190, 51405464, 51275502, 61475149]
- Natural Science Foundation of Anhui Province [1408085ME104]
- Fundamental Research Funds for the Central Universities
- Chinese Thousand Young Talents Program
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Ultrahigh density data storage is in high demand in the current age of big data and thus motivates many innovative storage technologies. Femtosecond laser induced multi-dimensional optical data storage is an appealing method to fulfill the demand of ultrahigh storage capacity. Here we report a femtosecond laser induced two-stage optical storage in bisazobenzene copolymer films by manipulating the recording energies. Different mechanisms can be selected for specified memory use: two-photon isomerization (TPI) and laser induced surface deformation. Giant birefringence can be generated by TPI and brings about high signal-to-noise ratio (> 20 dB) multi-dimensional reversible storage. Polarization-dependent surface deformation arises when increasing the recording energy, which not only facilitates the multi-level storage by black bits (dots), but also enhances the bits' readout signal and storing stability. This facile bits recording method, which enables completely different recording mechanisms in an identical storage medium, paves the way for sustainable big data storage. (C) 2016 Optical Society of America
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