Abstract
Recently multi-dimensional data storage has been intensively researched. Four-dimensional storage can be achieved by combining ultra-fast laser based multilayer recording and polarization-multiplexed technology. One of the obstacles is the readout crosstalk between different layers and polarization states. In this paper, we report on the high signal-to-noise ratio (SNR) four-dimensional data storage using femtosecond pulsed laser. Different polarization-encoded patterns are recorded by tightly focusing a polarized femtosecond laser beam (800nm, 80MHz, 80fs) in the same portion of multilayer film, and retrieved by placing the sample between two orthogonal polarizers. Compared with other readout methods, the recorded patterns are read out with a higher signal-to-noise ratio in the absence of crosstalk.
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