Narrow/Broad-Band Absorption Based on Water-Hybrid Metamaterial
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam
Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam
Thai Nguyen University of Education, Thai Nguyen University, Thai Nguyen 25000, Vietnam
Dongwoo Fine-Chem, Pyeongtaek 17956, Korea
Department of Physics, Quantum Photonic Science Research Center and RINS, Hanyang University, Seoul 04763, Korea
Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
Authors to whom correspondence should be addressed.
Crystals 2020, 10(5), 415; https://doi.org/10.3390/cryst10050415
Received: 5 May 2020 / Revised: 18 May 2020 / Accepted: 19 May 2020 / Published: 22 May 2020
(This article belongs to the Special Issue Metamaterials)
In this work, the possibility of a switchable metamaterial absorber is proposed to control absorption bandwidth in the WiMAX/LTE (worldwide interoperability for microwave access/long term evolution) band, by taking advantage of the low cost and myriad structural configurations afforded by water-based metamaterials. By exploiting truncated cone-type resonators, the fractional bandwidth of 27.6% of absorption spectrum can be adjusted flexibly to be 7.4% of the narrow-band absorption depending on the volume of injected water, in both simulation and experiment at room temperature. In particular, this control method can be applied stably for different temperature of injected water. We describe a dynamic mechanism for broadband MA, as well as a principle for controlling the absorption characteristics utilizing a combination of magnetic resonance and perfect impedance matching. These results are a stepping-stone towards the realization of smart electronics integrated with multi-functional metamaterials in military, biomedical, communication and other fields.