May 2021
Spotlight Summary by Ilya Shadrivov
High frequency meta-ferroelectrics by inverse design
It has been known that metamaterials offer enhanced nonlinear and tunable properties, and their response to tuning stimulus is larger than that of the constituent components individually. In this work, researchers from the United Kingdom performed a systematic study of the tunable properties of composite materials containing ferroelectrics. Such tunable composite materials are of great importance in the microwave frequency range, where tunability is used in many devices, such as antennas, filters, phase modulators and others. By solving an inverse design problem, Vial and Hao have shown which geometries possess the strongest tunability enhancement. In fact, a maximum theoretical enhancement of 34% compared to the bulk ferroelectric is predicted in the optimized metamaterial, whose unit cell resembles a bow-tie antenna. The authors went further and performed optimization of the structures over two parameters simultaneously: tunability and losses. Since ferroelectrics are typically lossy, a compromise between the tunability strength and lower losses can be obtained in properly designed metamaterials.
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Article Information
High frequency meta-ferroelectrics by inverse design
Benjamin Vial and Yang Hao
Opt. Mater. Express 11(5) 1457-1469 (2021) View: Abstract | HTML | PDF