Holographic communication using programmable coding metasurface

Abstract

With rapid development of holography, metasurface-based holographic communication scheme shows great potential in development of adaptive electromagnetic function. However, conventional passive metasurfaces are severely limited by poor reconfigurability, which makes it difficult to achieve wavefront manipulations in real time. Here, we propose a holographic communication strategy that on-demand target information is firstly acquired and encoded via a depth camera integrated with modified YOLOv5s target detection algorithm, then transmitted by software defined radio modules with long term evolution at 5 GHz, and finally reproduced in the form of holographic images by spin-decoupled programmable coding metasurfaces at 12 GHz after decoding through modified Gerchberg–Saxton algorithm. Experiments are conducted to demonstrate the brand-new concept of optical information conversion to electromagnetic one via above intelligent scheme. Our strategy may open a novel avenue toward applications of near-field communication based on adaptive variation of electric field patterns (i.e. holographic images).

Switchable optical trapping and manipulation enabled by polarization-modulated multifunctional phase-change metasurfaces

“…Metasurfaces, 2D ensembles of ultrathin subwavelength meta-atoms, allow for any desired optical functions with exceptional versatility due to its unparalleled control over the amplitude, phase and polarization of light beams, thus providing a promising solution to current challenges. Various configurations of metasurfaces have been extensively investigated, including ultrathin metalenses [10][11][12], meta-holography [13][14][15], meta-sensors [16][17][18][19], and particle-trapping meta-devices [20][21][22][23][24]. Of particular interest is the capacity of metasurfaces to facilitate flexible and precise multi-dimensional manipulation of particles at the chip level by assigning specific phase distributions.…”