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A multifunctional meta-hologram design, developed by researchers at Pohang University of Science and Technology (POSTECH), can be used to create different hologram images depending on the direction of the incident light that falls on the device. Conventional meta-holograms can display images when the incident light falls in one direction only. The POSTECH meta-hologram was created from a monolayer meta-holographic optical device.
To design directional sensitivity into their meta-hologram, the researchers included direction-controlled, spin-dependent holographic recordings in the monolayer structure. The metasurface hologram they designed consists of nano half-waveplates of low-loss, hydrogenated amorphous silicon. The half-waveplates…READ MORE