Polarization and Frequency Multiplexed Terahertz Meta‐Holography
Polarization and Frequency Multiplexed Terahertz Meta‐Holography
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DOI：
10.1002/adom.201700277
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发表时间：
2017-06
影响因子：
9
通讯作者：
Qiu Wang;Xueqian Zhang;E. Plum;Quan Xu;Minggui Wei;Yuehong Xu;Huifang Zhang;Y. Liao;J. Gu;Jiaguang Han;Weili Zhang
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文献类型：
--
作者：
Qiu Wang;Xueqian Zhang;E. Plum;Quan Xu;Minggui Wei;Yuehong Xu;Huifang Zhang;Y. Liao;J. Gu;Jiaguang Han;Weili Zhang
寻求对电磁波的有效和精确控制一直是光学领域的一个重要焦点。纳米制造技术的进步导致了设计超表面，通过实现光学性质的几乎任意空间分布，开辟了新的可能性。本研究展示了一种多路复用元全息图，在不同的偏振和不同的太赫兹频率下产生不同的图像。利用C形条形谐振器作为基本单元，实现了在每个像素上同时进行二值调幅和二值相位调制。通过对每个像素的振幅和相位的偏振和频率选择性独立同时控制，所提出的元全息图利用了电磁波的所有四个基本特性。产生全息图像的“C”，“F”，“T”，或“W”取决于偏振和频率证明了理论和实验。这种方法允许调制电磁波的所有特性，为设计具有多路复用功能的复杂元表面和元全息图铺平了道路，这可能在多通道通信和数据存储中有应用。
Seeking effective and precise control over electromagnetic waves has always been an important focus in optics. Advances in nanofabrication technology have led to designer metasurfaces, which open up new possibilities by allowing almost arbitrary spatial distributions of optical properties to be realized. This study demonstrates a multiplexed meta‐hologram generating different images for different polarizations and different terahertz frequencies. By utilizing C‐shape bar resonators as the basic unit cells, simultaneous binary amplitude modulation and binary phase modulation in each pixel is realized. With polarization and frequency selective independent simultaneous control of amplitude and phase in every pixel, the proposed meta‐hologram makes use of all four fundamental properties of electromagnetic waves. Generation of holographic images of “C,” “F,” “T,” or “W” depending on polarization and frequency is demonstrated theoretically and experimentally. This approach, allowing for modulation of all characteristics of electromagnetic waves, paves the way for designing complex metasurfaces and metaholograms with multiplexed functionalities, which may have applications in multichannel communication and data storage.