期刊
OPTICAL REVIEW
卷 28, 期 4, 页码 484-490出版社
OPTICAL SOC JAPAN
DOI: 10.1007/s10043-021-00682-4
关键词
Terahertz; Plasmonic; Planar lens; Focal length
类别
资金
- State Key Laboratory of Advanced Optical Communication Systems Networks, China [2020GZKF006]
- National Science Fund of China [61572366]
- Zhejiang Natural Science Foundation [LQ19F050002]
- Ningbo Natural Science Foundation [2018A610089]
A plasmonic planar lens operating at terahertz region is designed with InSb micro-slit array, utilizing varying dielectric slit width for desired beam phase retardation. The focal spot of this lens can be actively controlled by altering temperature due to the permittivity thermo-tunable property of InSb, and 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 have potential important applications in imaging, signal processing, and microprobes for THz system and technologies.
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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