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Polychromatic and polarized multilevel optical data storage.

Xu Ouyang1, Yi Xu, Ziwei Feng

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Summary
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This study combines optical multiplexing and multilevel coding to significantly enhance optical data storage (ODS) capacity. By controlling laser power, wavelength, and polarization, researchers can selectively activate nanorod hot spots for denser data recording.

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Area of Science:

  • Nanophotonics and Plasmonics
  • Optical Information Processing
  • Materials Science

Background:

  • Optical data storage (ODS) capacity is limited by current technologies.
  • Multiplexing light across physical dimensions and multilevel coding are known methods to increase data density.
  • Disordered plasmonic structures offer unique optical properties.

Purpose of the Study:

  • To investigate the simultaneous combination of physical dimension multiplexing and multilevel coding for boosting ODS capacity.
  • To explore the use of excitation power-dependent thermal reshaping in gold nanorod (GNR) structures.
  • To demonstrate polychromatic and polarized multiplexing of multilevel coding in disordered plasmonic systems.

Main Methods:

  • Utilizing wavelength and polarization-sensitive random hot spots in coupled disordered gold nanorods (GNRs).
  • Manipulating excitation power to control thermal reshaping of the ODS medium.
  • Employing different laser beam combinations of wavelength and polarization to selectively activate hot spots.

Main Results:

  • Demonstrated a novel mechanism for dramatically increasing ODS capacity.
  • Achieved simultaneous polychromatic and polarized multiplexing with multilevel coding.
  • Showcased selective activation of hot spots by controlling laser power, wavelength, and polarization.

Conclusions:

  • The combined approach of physical dimension multiplexing and multilevel coding offers a significant advancement in ODS capacity.
  • Disordered plasmonic structures, specifically GNRs, provide a viable platform for high-density optical data storage.
  • Potential applications include high-capacity optical data storage and advanced watermarking techniques.