Abstract-Characteristic analysis of a photoexcited tunable metamaterial absorber for terahertz waves

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  • Pibin Bing, 
   
  • Xinyue Guo, Hua
   
  •  Wang, 
   
  • Zhongyang Li, J
   
  • ianquan Yao,
   https://link.springer.com/article/10.1007%2Fs12596-019-00533-1

The absorption characteristics of a photoexcited tunable perfect metamaterial absorber (PMA) at terahertz (THz) frequencies are analyzed based on the split-ring resonators (SRRs)-dielectrics-metallic structure, which are caused by different thicknesses and dielectric constants of polyimide, cell sizes and widths of SRRs, and lengths and conductivities of the photosensitive silicon. The results manifest that the resonance frequency and absorption strength of the designed PMA can be tuned by adjusting the shape, size, thickness, and properties of the metallic structure and dielectric spacer. The simple design and wide frequency tuning range of the PMA can find potential applications in terahertz detectors, filters, switchers, and absorbers.

Abstract-Low-loss terahertz polarization splitter based on an asymmetric dual-suspended-core fiber

Yuan-Feng Zhu,  Xin Liu,  Chun-Fang Rao; Hua Zhong, Hai-Mei Luo,  Yan-Hua Chen, Zhi-Qing Ye,  Hua Wang,

https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-57/issue-8/086112/Low-loss-terahertz-polarization-splitter-based-on-an-asymmetric-dual/10.1117/1.OE.57.8.086112.short?SSO=1

A relatively simple design of a terahertz (THz) polarization splitter based on an asymmetric dual-suspended-core fiber is proposed. One core is formed by two intersecting rectangular dielectric strips with dissimilar thickness, whereas the other is a round solid core suspended by crossed dielectric strips with the same thickness. The distance between the cores can be adjusted to ensure a short splitting length and low transmission loss. A THz polarization splitter with a length of 1.27 cm is realized with a low transmission loss of 0.53 and 0.67 dB for the x- and y-polarization modes, respectively. An extinction ratio of about −20  dB and a broad bandwidth of 0.046 THz are demonstrated.

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