Measurement of a tunable metamaterial based on Polymeric Methyl Methacrylate and its application in smart packaging temperature detection

Abstract

Abstract Electromagnetic metamaterials/metasurfaces have been widely concerned by researchers because of their rich resonance properties. Metamaterial absorbers with single resonance mode and narrow bandwidth are often used in sensing fields. However, the development of such metamaterial absorbers by optimizing the dielectric layer structure has not received much attention. In this paper, a metamaterial absorber containing dielectric layers of the same thickness (PMMA and STO dielectric layers) are proposed and confirmed. At room temperature, an individual absorption peak is excited, and the single resonance mode and narrow bandwidth characteristic is obtained (resonant frequency is 266.14THz, peak value is 0.902, the FWHM is 1.1THz). The amplitude and resonance frequency of the metamaterial sample can be controlled by changing the thickness of PMMA or STO dielectric layers. An equivalent LC resonant circuit is constructed and used to interpret the relationship between the resonant frequency and the thickness of the dielectric layer. In further experimental measurements, the metamaterial sample was placed in an environment with a gradual change in temperature. Two metamaterial units with the same dielectric layer structure strategy are also proposed and simulated, and similar resonance behaviors can also be excited by these two new metamaterial units. The results show that the absorptive properties of the metamaterial sample show remarkable repeatability in the process of temperature increase and temperature decrease. Therefore, based on the properties of single resonance mode, narrow bandwidth, and reversibility, the metamaterial sample has the potential to be used in smart packaging sensing.