Abstract
Multi-channel metasurface holography based on polarization multiplexing
has received close attention
for its application in increasing information capacity. However, most
of the existing spin-selective metasurfaces focus on the utilization
of the cross-polarized channels while neglecting the co-polarized
channels. Moreover, the real-time dynamic switching of the incident
polarization of the metasurface remains a great challenge. This work
presents a dielectric metasurface that combines geometric and
propagation phase modulations. It allows phase control of a pair of
orthogonal circular polarizations. A liquid crystal (LC) film is
placed at the bottom layer of the metasurface to achieve dynamic
switching of the incident polarization of the metasurface. As a
proof-of-concept, we design and simulate a dielectric metasurface
integrated with liquid crystals (LCs) for three-channel holographic
displays. The LCs modulate the incident linear polarization into two
orthogonal circular polarizations and illuminate the metasurface. The
metasurface displays one holographic image in the vertical direction
from the co-polarized channel and two holographic images at certain
angles from the cross-polarized channel. It means that three
holographic images can be displayed simultaneously without overlapping
for linearly polarized (LP) light. Our design and simulations could
provide a new, to our knowledge, scheme for multi-channel holography
and active tunable metasurfaces.
Funder
National Natural Science Foundation of
China
Natural Science Foundation of Higher
Education Institutions of Anhui Province