Control amplitude and phase of light by plasmonic meta-hologram with T-shaped nano-cavity

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（6）
• 页码范围: 92-97
• 页数: 6页
• 语种: 英文
• DOI: 10.3788/COL201917.062402

摘要

Controlling both amplitude and phase of light in the subwavelength scale is a challenge for traditional optical devices.Here,we propose and numerically investigate a novel plasmonic meta-hologram,demonstrating broadband manipulation of both phase and amplitude in the subwavelength scale.In the meta-hologram,phase modulation is achieved by the detour phase distribution of unit cells,and amplitude is continuously modulated by a T-shaped nano-cavity with tunable plasmonic resonance.Compared to phase-only holograms,such a meta-hologram could reconstruct three-dimensional (3D) images with higher signal-to-noise ratio and better image quality,thus offering great potential in applications such as 3D displays,optical communications,and beam shaping.