Teng Yang, Yuqi Jin, Narendra B. Dahotre, Zhiming Wang, Arup Neogi
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Thermally tunable dispersive topology of hybrid acoustic meta-material lens with subwavelength resolution
Thermo-responsive hydrogel has rarely been applied in acoustic applications except for using a phononic crystal-based acoustic lens with linear transmission within the first phononic transmission bandgap using a homogenized medium concept. However, the higher transmission bands can offer metamaterial behavior with a negative index or anomalous dispersion characteristics. In the present study, the thermally responsive hydrogel-infilled phononic crystal lens was designed for the second and third transmission bands and served as a meta-material lens. The band structure and equifrequency contours of the proposed phononic crystal were calculated based on the frequency- and temperature-dependent speed of sound. A specific operating frequency range within the medium’s critical phase transition temperature induces a strong temperature-sensitive equifrequency topology that enables a negative to positive index of refraction shift. The acoustic focusing behaviors of the designed meta-material lens were verified with numerical simulation and experimental characterizations. The temperature-tunable focusing behaviors were applied to perform monostatic detection showing subwavelength resolution (~ 0.84 \(\lambda\)) with temperature-tunable detection distances.
期刊介绍：
Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field.
The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest.
Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials.
Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.
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