用于太赫兹波动态双模调制的光学控制电介质超表面

IF 20.6 1区 物理与天体物理 Q1 OPTICS Advanced Photonics Pub Date : 2023-03-01 DOI:10.1117/1.AP.5.2.026005
Haoyang Zhou, Sheng Zhang, Shunjia Wang, Yao Yao, Qingnan Cai, Jing Lin, Xiaoying Zheng, Zhuo Wang, Z. Tao, Qiong He, Lei Zhou
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引用次数: 2

摘要

摘要用超紧凑的设备动态控制太赫兹(THz)波是非常需要的,但以前实现的可调谐设备体积庞大,并且/或表现出有限的光调谐功能。在这里,我们通过实验证明了通过泵浦系统在不同的光波长下以模式选择或模式非选择的方式对介质超表面的太赫兹波进行动态调制。准正模理论揭示了共振模式的波函数与受不同波长泵浦激光激励的谐振腔内区域之间的空间重叠控制了物理特性。我们进一步设计/制造了一个介电超表面,并实验证明它可以动态控制入射太赫兹波的偏振状态,由泵浦光的强度和波长决定。最后,我们用数值方法演示了基于精心设计的介电超表面的泵浦波长控制光信息加密。我们的研究表明,泵浦波长可以成为动态控制太赫兹波的一个新的外部旋钮,这可能会激发出许多具有多种功能的可调谐元器件。
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Optically controlled dielectric metasurfaces for dynamic dual-mode modulation on terahertz waves
Abstract. Dynamically controlling terahertz (THz) waves with an ultracompact device is highly desired, but previously realized tunable devices are bulky in size and/or exhibit limited light-tuning functionalities. Here, we experimentally demonstrate dynamic modulation on THz waves with a dielectric metasurface in mode-selective or mode-unselective manners through pumping the system at different optical wavelengths. Quasi-normal-mode theory reveals that the physics is governed by the spatial overlap between wave functions of resonant modes and regions inside resonators perturbed by pump laser excitation at different wavelengths. We further design/fabricate a dielectric metasurface and experimentally demonstrate that it can dynamically control the polarization state of incident THz waves, dictated by the strength and wavelength of the pumping light. We finally numerically demonstrate pump wavelength-controlled optical information encryption based on a carefully designed dielectric metasurface. Our studies reveal that pump light wavelength can be a new external knob to dynamically control THz waves, which may inspire many tunable metadevices with diversified functionalities.
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来源期刊
CiteScore
22.70
自引率
1.20%
发文量
49
审稿时长
18 weeks
期刊介绍: Advanced Photonics is a highly selective, open-access, international journal that publishes innovative research in all areas of optics and photonics, including fundamental and applied research. The journal publishes top-quality original papers, letters, and review articles, reflecting significant advances and breakthroughs in theoretical and experimental research and novel applications with considerable potential. The journal seeks high-quality, high-impact articles across the entire spectrum of optics, photonics, and related fields with specific emphasis on the following acceptance criteria: -New concepts in terms of fundamental research with great impact and significance -State-of-the-art technologies in terms of novel methods for important applications -Reviews of recent major advances and discoveries and state-of-the-art benchmarking. The journal also publishes news and commentaries highlighting scientific and technological discoveries, breakthroughs, and achievements in optics, photonics, and related fields.
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