Features of representing the information content of holograms in terms of optical degrees of freedom

Gurevich, S. A.; Gurevich, Boris

doi:10.1134/s1063785012060053

Cited by 1 publication

(1 citation statement)

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“…On the other hand, according to information theory, there is an upper limit on data storage in a hologram regardless of the algorithms or multiplexing methods used, and this limit is related to the number of degrees of freedom and signal-to-noise ratio. [44] In a thin hologram, the maximum number of degrees of freedom is limited by the spatial bandwidth product (SBP), [45] which is also the total pixel number in a computer-generated holographic system according to the Whittaker-Shannon sampling theorem. [46] Hence, CDM holography itself cannot increase the channel infinitely, and the limited SBP of a hologram will lead to a trade-off between the number of channels and the information capacity in each channel.…”

Section: Discussionmentioning

confidence: 99%

Code Division Multiplexing Inspired Dynamic Metasurface Holography

Zhao

Wei

et al. 2021

Adv Funct Materials

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Metasurface holography is attracting increasing attention owing to its numerous advantages over conventional holography techniques, such as precise control of phase profiles, compact sizes, and multiple information channels via a single optical element. Metasurfaces provide a flexible platform for incorporating various multiplexing techniques. Inspired by code division multiplexing (CDM), which is widely employed in networking and wireless digital communications, metasurface holography for generating dynamic holographic images controlled by both the patterned beam profiles and polarization states is designed and realized in this study. Specifically, two orthogonal polarization states and 16 code bases of light illumination are combined to generate 32 independent channels. Only the correct code reference can decode the target image for a specific channel, providing encryption for information transportation. Meanwhile, the demonstrated metasurface holography with CDM can realize active modulation via a digital micromirror device. The proposed metasurface can be utilized to achieve dynamic information display, data storage, optical encryption, and other applications in optics.

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Section: Discussionmentioning

confidence: 99%