The optimization of the experimental parameters of two multiplexed holographic transmission gratings recorded in holographic polymer-dispersed liquid crystals is investigated. Two methods are used to record the holograms: simultaneous and sequential multiplexing. These two processes are optimized to produce two multiplexed Bragg gratings that have the same and the highest possible diffraction efficiencies in the first order. The two methods show similar results when suitable recording parameters are used. The parameters of the recorded gratings (mainly the refractive-index modulation) are retrieved by use of an extension of the rigorous coupled-wave theory to multiplexed gratings. Finally, the response of the holograms to an electric field is studied. We demonstrate few coupling effects between the behavior of both gratings, and we expect a possibility of switching from one grating to the other.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/ao.44.005273 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Holographically designed aperiodic lattices (ALs) have proven to be an exciting engineering technique for achieving electrically switchable single- or multi-frequency emissions in terahertz (THz) semiconductor lasers. Here, we employ the nonlinear transfer matrix modeling method to investigate multi-wavelength nonlinear (sum- or difference-) frequency generation within an integrated THz (idler) laser cavity that also supports optical (pump and signal) waves. The laser cavity includes an aperiodic lattice, which engineers the idler photon lifetimes and effective refractive indices.
View Article and Find Full Text PDFHighly-efficient full-color holographic movie based on silicon nitride metasurface.
Nanophotonics
April 2024
Department of Bio-Functions and Systems Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 Japan.
Metasurface holograms offer various advantages, including wide viewing angle, small volume, and high resolution. However, full-color animation of high-resolution images has been a challenging issue. In this study, a full-color dielectric metasurface holographic movie with a resolution of 2322 × 2322 was achieved by spatiotemporally multiplexing 30 frames with blue, green, and red color channels at the wavelengths of 445 nm, 532 nm, and 633 nm at the maximum reconstruction speed of 55.
View Article and Find Full Text PDFStructural-color meta-nanoprinting embedding multi-domain spatial light field information.
Nanophotonics
April 2024
Electronic Information School, and School of Microelectronics, Wuhan University, Wuhan, 430072, China.
Recently, multifunctional metasurface has showcased its powerful functionality to integrate nanoprinting and holography, and display ultracompact meta-images in near- and far-field simultaneously. Herein, we propose a tri-channel metasurface which can further extend the meta-imaging ranges, with three independent images located at the interface, Fresnel and Fourier domains, respectively. Specifically, a structural-color nanoprinting image is decoded right at the interface of the metasurface, enabled by varying the dimensions of nanostructures; a Fresnel holographic image and another Fourier holographic image are present at the Fresnel and Fourier (far-field) domains, respectively, enabled by geometric phase.
View Article and Find Full Text PDFInformation multiplexing from optical holography to multi-channel metaholography.
Nanophotonics
December 2023
School of Physics and Astronomy, Faculty of Science, Monash University, Melbourne, Victoria 3800, Australia.
Article Synopsis
- - Holography is crucial for advancing various technologies like 3D displays, LiDAR, optical encryption, and AI, by facilitating effective optical information storage and processing.
- - The review discusses the evolution from traditional volume holograms to modern digital holography using ultrathin metasurfaces, highlighting holographic multiplexing and fabrication techniques.
- - The potential applications of metasurface holography are explored, particularly in high bandwidth scenarios that enhance sensitivity to light's orbital angular momentum, with a look towards future advancements in the field.
Article Synopsis
- Frequency-multiplexed metasurfaces enhance multi-channel communication but often lack support for complex amplitude and circular polarization, leading to challenges in design.
- Current designs are time-consuming due to the need for precise tuning to suppress crosstalk between channels.
- A new approach using deep learning and genetic algorithms enables the creation of meta-atoms that achieve 2-bit amplitude and arbitrary phase modulation, resulting in improved design efficiency and performance in tasks like holography and data storage.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!