Iron Man's Jarvis Becomes Reality… Touchable Hologram Development
Published2020.11.11 10:50Liquid crystal combinations that respond to electricity, temperature, and touch
Implementation of optical functions such as invisibility cloaks, super lenses, and negative refractive devices
The National Research Foundation of Korea announced on the 11th that a research team led by Professors Noh Jun-seok and Kim Young-ki of Pohang University of Science and Technology developed an ultra-small holographic device that responds to external stimuli by combining liquid crystal technology with metamaterials.
Metamaterials are artificial materials that do not exist in nature, and are called dream materials that can implement new optical functions such as invisibility cloaks, super lenses, and negative refractive devices.
Existing devices utilizing metasurfaces cannot change their optical properties once fabricated, limiting them to displaying only a single, initially programmed image in space. To address this issue, the research team incorporated liquid crystals, which can easily change their optical properties in response to external stimuli, into the metamaterial.
A specially designed liquid crystal-based light modulator is combined with the metasurface, and depending on the material and design of the liquid crystal cell, it is made to respond to various external stimuli such as finger touch, voltage, or heat.
If a liquid crystal designed to react to actual voltage is grafted, a holographic image can be quickly converted within a few milliseconds by applying a voltage of 0.8 V or 1 V.
A device incorporating temperature-responsive liquid crystals switches holographic images when the temperature exceeds 47°C. The device, designed to be touch-responsive, was able to rapidly change the holographic image with just a light finger touch between 10 kPa and 0.01 MPa.
In particular, it has been shown to be capable of producing extremely clear holographic images in the visible light range with a wavelength of 450 nm to 700 nm. Meanwhile, the research team plans to continue research to integrate this device into sensors that detect microorganisms or chemicals.
The developed ultra-small holographic device is expected to serve as a clue to advancing high-definition holographic video playback optical elements, temperature-sensitive holographic sensors, and future interactive/haptic holographic technologies.
Meanwhile, the results of this research were published as a frontispiece in the international academic journal 'Advanced Materials' on November 11.
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