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    Electrically Switchable Nanoantennas Developed for Holographic Video Technology

    Researchers are developing electrically switchable nanoantennas as the basis for holographic video technology. Credits: University of Stuttgart / PI4, Julian Karst

    Real feeling in an online video conference

    Video conferences play an important role during the Covid-19 pandemic and are set to dominate many conferences in the future. 3D video is needed to achieve the true sense of face-to-face dialogue, but holographic technology is still lacking. Researchers at the University of Stuttgart in Germany have introduced a whole new approach to achieving such a dynamic holographic display based on electrically switchable plasmon nanoantennas made from conductive metal polymers. Did. This key element provides the missing technology that enables holographic displays at video rates. This enables virtual meetings with a “real” feel.A paper detailing this work has been published in a prestigious journal. Chemistry October 28, 2021.

    Virtual meeting hologram

    Future Virtual Meeting: The meeting members on the right are wearing VR / AR goggles that display a female hologram on the left. Credits: University of Stuttgart / PI4, Julian Karst

    Holograms that create impressive 3D still images are well known. Dynamic holograms that can be switched at video rates using data from high-speed Internet connections have never been possible. Previously, the limiting factor was display resolution. Holographic images require a resolution of 50,000 dpi (pixels per inch). This is 100 times the best smartphone display. For such resolutions, the pixel size should be reduced to 0.5 micrometer (1/1000 millimeter). However, current LCD technology does not allow such small pixels and is limited to pixel sizes of a few micrometers.

    Researchers at the University of Stuttgart have succeeded in breaking this fundamental barrier. In an interdisciplinary collaboration between physics and chemistry, they developed the idea of ​​using electrically switchable plasmonic nanoantennas made of conductive polymers with dimensions of only a few hundred nanometers.

    Metal Polymer Meta Surface Nano Antenna

    Scanning electron microscope (SEM) images of metal polymer meta-surfaces that can be used for electrical nanoantenna switching. Credits: University of Stuttgart / PI4, Julian Karst

    Conductive functional polymers as suitable switchable materials

    For several years, researchers have created metasurfaces that produce static 3D holograms. However, those components, or nanoantennas, were made of metals such as gold and aluminum that were not switchable like common liquid crystal materials. After years of searching for suitable materials, Dr. Mario Hentschel, a group of doctoral student Julian Karst and nanophotonics expert Professor Harald Giessen, worked with polymer chemist Professor Sabine Ludwigs and his team to conduct. Plasmonics that can switch between sex polymers. Sabine Ludwigs provided the expertise in electrochemical switching of such functional polymers, which was the focus of the 2000 Nobel Prize in Chemistry.

    So far, such materials have been mainly used in the current transportation of flexible displays and solar cells. In collaboration with Monika Ubl, the head of the clean room, Karst and Hentschel have developed a process for nanostructuring metal polymers using a combination of electron beam lithography and etching to create plasmonic nanoantennas. The team has shown that by applying a voltage from -1 volt to +1 volt, the optical appearance of the nanoantenna can be switched between the optical appearance of shiny metal and transparent materials. This transition effect also works at video rates of 30 Hz. Despite being tens of nanometers thick and less than 400 nanometers in size, nanoantennas work the same as the much larger and thicker liquid crystals used in today’s state-of-the-art technology. These new devices reach the required pixel density of approximately 50.000dpi.

    Plasmonic Polymer Nano Antenna

    Left: Image showing a plasmon polymer nanoantenna that has been switched to a dielectric (glassy) state. Rays from below only pass above without being deflected. Right: An image showing a plasmon polymer nanoantenna that has been switched to a metallic state. Rays from below are laterally deflected as they pass through the sample. As the light moves up, it also changes its dominant hand (see the different directions of rotation of the spiral light). Credits: University of Stuttgart / PI4, Julian Karst

    Karst created a simple hologram metasurface from a nanoantenna that can deflect an infrared laser beam 10 degrees to one side by applying a voltage. He is currently working on making this bias available in a variety of angles in applications for LIDAR devices in self-driving cars, and there is a great deal of interest in the automotive industry. In addition, Karst created a hologram that behaves like an optical lens that can be turned on and off with the application of ± 1 volt. This technology is very important for future smartphone cameras and optical sensors that can zoom from wide-angle to telephoto by switching the applied voltage. Currently, this feature requires up to 4 lenses.

    In the future, Professor Harald Giessen and his team aim to process every pixel individually and freely and dynamically change the hologram at the video rate. We also need to shift the optical properties of polymer nanoantennas to the visible wavelength range, which requires collaboration with chemists and materials scientists. You can work with engineers to integrate an integrated dynamically switchable optical display and the first moving hologram into AR / VR goggles and finally into a smartphone screen or even a TV.

    Adopting Moore’s Law for Display Technology, this approximately 100x advance could occur commercially around 2035.

    See also: “Electrically Switchable Metal Polymer Nano Antennas” by Julian Karst, Moritz Floess, Monika Ubl, Karsten Dingler, Claudia Malacrida, Tobias Steinle, Sabine Ludwigs, Mario Hentschel, Harald Giessen, October 28, 2021, Science. ..
    DOI: 10.1126 / science.abj3433

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    Electrically Switchable Nanoantennas Developed for Holographic Video Technology Source link Electrically Switchable Nanoantennas Developed for Holographic Video Technology

    The post Electrically Switchable Nanoantennas Developed for Holographic Video Technology appeared first on California News Times.

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