光电工程, 2020, 47 (5): 190674, 网络出版: 2020-05-27  

太赫兹超表面计算全息

Metasurface-based computer generated holography at terahertz frequencies
作者单位
天津大学精密仪器与光电子工程学院太赫兹研究中心,天津 300072
摘要
全息术是一种三维成像技术,它已经被应用于多种实际场景。随着计算机科学与技术的迅猛发展,计算全息由于其方便和灵活的特性,已经成为一种广泛应用的全息成像方法。本文回顾了我们近期基于超表面的太赫兹计算全息研究进展。其中,作为全息板的超表面展示出了超越传统光学器件的独特性能。首先,利用超表面实现了对于全息板每个像素的相位振幅同时且独立的调控,进而实现了高质量全息成像。这种新的电磁波操控能力也带来了新的全息成像效果,如利用介质超表面实现了全息像沿传播方向上的连续变化。其次,对超表面在不同偏振态下的响应进行设计,分别实现了线偏振态与频率复用、圆偏振态复用、以及基于表面波的偏振复用超表面全息术。此外,本文提出了依赖于温度变化而主动可控的超表面全息术,为今后计算全息术的设计与实现提供了新的方案,也推动了超表面在实际应用方面的发展。
Abstract
Holography is a kind of technique enabling 3D imaging which has been applied in many practical fields. With the rapid development of computer science and technology, computer generated holography (CGH) has become a common holography design method due to its high convenience and flexibility. Herein, we present a review of our recent progress in metasurface-based terahertz CGH. In these demonstrations, the metasurfaces acting as the holograms have shown the novel capabilities beyond the conventional counterparts. We first present a meta-hologram with simultaneous and independent phase and amplitude control over each pixel, which enables high-quality holographic imaging. Such new characteristic also predicts new holographic imaging performances including holographic images transforming continuously along the propagation direction realized by dielectric metasurface. Then different responses under different incident polarization states are designed. A linear polarization and frequency multiplexed meta-hologram, a reflective circular polarization multiplexed meta-hologram, and a surface-wave-based polarization multiplexed meta-hologram have been achieved respectively. Furthermore, a thermally dependent dynamic meta-hologram which can change the holographic image actively is also given. The proposed method paves a novel way to the design and realization of CGH functional devices in the future and contributes to the development of metasurfaces towards practical applications.

刘星博, 王球, 许全, 张学迁, 许悦红, 张伟力, 韩家广. 太赫兹超表面计算全息[J]. 光电工程, 2020, 47(5): 190674. Liu Xingbo, Wang Qiu, Xu Quan, Zhang Xueqian, Xu Yuehong, Zhang Weili, Han Jiaguang. Metasurface-based computer generated holography at terahertz frequencies[J]. Opto-Electronic Engineering, 2020, 47(5): 190674.

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