Chinese Optics Letters, Vol. 17, Issue 6, 062402 (2019)
Control amplitude and phase of light by plasmonic meta-hologram with T-shaped nano-cavity
Wei Song, Shanguang Zheng, Yanan Fu, Changjun Min*, Yuquan Zhang, Zhenwei Xie, and Xiaocong Yuan**
- Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
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.
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