期刊
PHOTONICS
卷 8, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/photonics8040116
关键词
terahertz; metamaterial; negative refraction; dual bands
类别
资金
- National Natural Science Foundation of China [61865009, 61927813]
A method to achieve dual-band terahertz left-handed metamaterials was proposed using silver plasmonic fishnet structures, which resulted in negative permittivity and permeability. Experimental results confirmed negative refraction, potentially enabling practical applications in terahertz imaging, sensors, and communication.
Plasmonic fishnet structures are proposed to realize dual-band terahertz (THz) left-handed metamaterials (LHMs). The calculated permittivity epsilon and permeability mu of single-layer LHMs show that epsilon < 0 and mu < 0 can be simultaneously satisfied in two frequency bands, resulting in dual-band LHMs. The electric and magnetic field distributions are consistent with the current distributions and confirm the physical mechanism of negative permeability. Furthermore, the existence of negative refraction is validated by a stacked LHMs prism with an angle of 1.79 degrees. It is shown that at 2.04-2.42 THz and 3.12-3.28 THz bands, negative refractive indices of the prism can be obtained, facilitating the practical application of LHMs in THz image, sensor, detection, communication, and so on.
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