Holographic Optical Elements and Display Technologies
Summary
Holographic optical elements (HOEs) constitute a class of diffractive optical devices that harness recorded interference patterns within photosensitive media to manipulate light in precise and highly efficient ways. Fabricated commonly in photopolymers, HOEs can form volume phase gratings with tailored refractive index modulation, enabling wavelength selectivity, beam steering and compact multiplexing. In display technologies, these elements serve as in-couplers and out-couplers in waveguide architectures for augmented and mixed-reality near-eye systems, offering slender form factors and large fields of view. Advances in material chemistry and recording techniques have enhanced diffraction efficiency and environmental stability, while emerging dynamic HOEs based on spatial light modulators and polymer–disperse liquid crystals present opportunities for reconfigurable optics. Integration with freeform surfaces and metasurfaces further refines aberration control and colour rendering. Beyond wearable displays, HOEs find applications in solar concentrators, optical sensing and high-density data storage. The interplay of nanofabrication, holographic recording kinetics and system-level design continues to drive developments towards lighter, brighter and more versatile holographic display platforms.
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Holographic Optical Elements and Display Technologies publication trend
The graph below shows the total number of articles in holographic optical elements and display technologies across all publications each year (not limited to Nature Index journals).
Technical terms
Holographic optical element (HOE): A diffractive optical device recorded by interference within a photosensitive medium, capable of beam shaping and wavelength selectivity.
Photopolymer: A photosensitive polymer matrix in which holographic gratings are formed by light-induced polymerisation and diffusion, yielding volume refractive-index modulations.
Waveguide: A transparent medium guiding light via total internal reflection; in near-eye displays, waveguides integrate HOEs as couplers to deliver images to the eye.
Diffraction efficiency: The ratio of power diffracted into a desired order by a grating or HOE to the incident optical power, indicative of device performance.
Field of view (FOV): The angular extent of the visible image delivered by a near-eye display, typically measured diagonally.
References
- Uniformity improvement of two-dimensional surface relief grating waveguide display using particle swarm optimization.. Optics Express (2022).
- Waveguide combiners for mixed reality headsets: a nanophotonics design perspective. Nanophotonics (2020).
- The Chemistry and Physics of Bayfol® HX Film Holographic Photopolymer. Polymers (2017).
- Characterization of volume holographic optical elements recorded in Bayfol HX photopolymer for solar photovoltaic applications.. Optics Express (2016).
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