Wang Bo, Quan Baogang, He Jingwen, Xie Zhenwei, Wang Xinke, Li Junjie, Kan Qiang, Zhang Yan
Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, and Beijing Advanced Innovation Center for Imaging Technology, Beijing, 100048, China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Sci Rep. 2016 Oct 18;6:35657. doi: 10.1038/srep35657.
A wavelength de-multiplexing metasurface hologram composed of subwavelength metallic antennas is designed and demonstrated experimentally in the terahertz (THz) regime. Different character patterns are generated at the separated working frequencies 0.50 THz and 0.63 THz which determine a narrow frequency bandwidth of 130 GHz. The two working frequencies are around the central resonance frequency of the antennas where antennas behave strong wavefront modulation. Each antenna is fully utilized to control the wavefront of the metasurface at different frequencies by an optimization algorithm. The results demonstrate a candidate way to design multi-colors optical display elements.
设计了一种由亚波长金属天线组成的波长解复用超表面全息图，并在太赫兹（THz）波段进行了实验验证。在0.50 THz和0.63 THz这两个分离的工作频率处产生了不同的特征图案，这确定了130 GHz的窄频率带宽。这两个工作频率围绕天线的中心共振频率，此时天线表现出强烈的波前调制。通过优化算法，每个天线都被充分利用来控制超表面在不同频率下的波前。结果展示了一种设计多色光学显示元件的候选方法。
