A complex-amplitude hologram using an ultra-thin dielectric metasurface. Issue 47 (27th November 2020)

• Record Type: Journal Article
• Authors: Jiang, Qiang; Cao, Liangcai; Huang, Lingling; He, Zehao; Jin, Guofan
• Is Part Of: Nanoscale. Volume 12:Issue 47(2020)
• Page Start: 24162
• Page End: 24168
• Publication Date: 2020-11-27
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d0nr06461k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : An ultrathin dielectric metasurface which can modulate the complex amplitude in the transmission mode is proposed for a metasurface complex hologram. Abstract : Metasurfaces have been widely studied for the arbitrary manipulation of the amplitude, phase and polarization of a field at the subwavelength scale. Holographic images with a high resolution and a large viewing angle can be reconstructed from phase-only holograms encoded in a metasurface. The quality of a holographic image can be greatly improved by using complex-amplitude holograms. However, realizing a high efficiency metasurface with simultaneous and independent control of the amplitude and phase remains a great challenge. In this work, an ultrathin dielectric metasurface which can modulate the complex amplitude in the transmission mode is proposed for a metasurface hologram. The amplitude is controlled by adjusting the dipoles and quadrupoles by tuning the geometric size. The phase value from 0 to 2π is manipulated based on the Pancharatnam–Berry phase (also called the geometric phase) by rotating the meta-atom. The experimental results show that a three-dimensional image reconstructed from a complex-amplitude hologram presents better quality than that from a phase-only hologram. The proposed metasurface shows great potential for applications that require complex amplitude modulation.