  Encoding information in light polarization is of great importance in
facilitating optical data storage (ODS) for information security and data
storage capacity escalation. However, despite recent advances in nanophotonic
techniques vastly enhancing the feasibility of applying polarization channels,
the data fidelity in reconstructed bits has been constrained by severe
crosstalks occurring between varied polarization angles during data recording
and reading process, which gravely hindered the utilization of this technique
in practice. In this paper, we demonstrate an ultra-low crosstalk
polarization-encoding multilayer optical data storage technique for
high-fidelity data recording and retrieving by utilizing a nanofibre-based
nanocomposite film involving highly aligned gold nanorods (GNRs). With
parallelizing the gold nanorods in the recording medium, the information
carrier configuration minimizes miswriting and misreading possibilities for
information input and output, respectively, compared with its randomly
self-assembled counterparts. The enhanced data accuracy has significantly
improved the bit recall fidelity that is quantified by a correlation
coefficient higher than 0.99. It is anticipated that the demonstrated technique
can facilitate the development of multiplexing ODS for a greener future.
