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- Title
Dynamically Tunable and Polarization-Insensitive Bifunctional Metamaterials Based on Vanadium Dioxide.
- Authors
Shi, Yuanchao; Mei, Jinshuo; Li, Nianchao; Gong, Dagang
- Abstract
In this paper, a bifunctional switchable terahertz metamaterial device is proposed. Dynamic switching between broadband absorption and electromagnetically induced transparency (EIT) is realized based on the phase transition properties of vanadium dioxide (VO2). Dynamic tuning of the amplitude of the two functions was achieved by controlling the conductivity of vanadium dioxide. The proposed structure consists of five layers and is easily patterned. When VO2 demonstrates metallic properties, the Fabry-Perot resonance can be generated between the top VO2 resonant layer and the middle VO2 thin film layer. The device acts as a broadband absorber with amplitude more than 90% in the range of 0.62–1.46 THz. When VO2 is in the insulated state, metal double ring layer is resonated and coupled with each other. The device serves as an electromagnetically induced transparency with transparent amplitude more than 90% in the range of 0.47–1.02 THz. The magnitude tuning with a modulation depth of 94.4% can be achieved and the group delay is 2.23 ps. Moreover, both broadband absorption and EIT are characterized by polarization insensitivity, and have good properties in a wide range of incidence angles. Therefore, it will have promising applications in the field of optical devices and other electromagnetic fields.
- Subjects
VANADIUM dioxide; PHASE transitions; TERAHERTZ materials; METAMATERIALS; ELECTROMAGNETIC fields; OPTICAL devices; METALLIC films; VANADIUM
- Publication
Plasmonics, 2024, Vol 19, Issue 1, p251
- ISSN
1557-1955
- Publication type
Article
- DOI
10.1007/s11468-023-01990-y