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Tunable terahertz plasmonic planar lens based on InSb micro-slit array

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Abstract

A plasmonic planar lens operating at terahertz (THz) region based on InSb micro-slit array with varying dielectric slit width is designed and numerically investigated. Dielectric slits provide desired phase retardations of beam manipulating with varying phase propagation constant. Taking advantage of the permittivity thermo-tunable property of InSb, the focal spot of this lens can be actively controlled by altering temperature without needing to change the geometry of the device. Furthermore, the focal spot can move along the vertical direction in the focus area by properly choosing the medium filled in the micro-slits. This ultracompact and focal spot tunable planar plasmonic lens may find potential important applications in the imaging, signal processing, and microprobes for THz system and technologies.

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Acknowledgements

The project was funded by State Key Laboratory of Advanced Optical Communication Systems Networks, China (Grant Nos. 2020GZKF006) and the National Science Fund of China (Grant Nos. 61572366) and the Zhejiang Natural Science Foundation (Grant Nos. LQ19F050002). This work is also Fund by the Ningbo Natural Science Foundation (Grant Nos. 2018A610089).

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Authors and Affiliations

  1. College of Electronic and Information Engineering, West Anhui University, Luan, 237012, China

    Huaiqing Liu, Maosheng Fu, Xiancun Zhou & Yao Nie

  2. Key Lab of All Optical Network & Advanced Telecommunication Network of EMC, Beijing Jiaotong University, Beijing, 100044, China

    Youchao Jiang

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  1. Huaiqing Liu
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Correspondence to Huaiqing Liu.

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Liu, H., Jiang, Y., Fu, M. et al. Tunable terahertz plasmonic planar lens based on InSb micro-slit array. Opt Rev 28, 484–490 (2021). https://doi.org/10.1007/s10043-021-00682-4

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  • DOI: https://doi.org/10.1007/s10043-021-00682-4

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