Recently, Zhang Peng, a researcher at the National Peopleâ€™s Key Laboratory of Transient Optics and Photonics Technology, Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, collaborated with Heilongjiang University, Huazhong University of Science and Technology, Hong Kong Polytechnic University, and the University of Michigan to design a Spiral superstructure material and application of this material achieves sound velocity reduction and beam phase adjustment. As the co-first author unit, the research results were published in Nature Communications magazine on May 20 and entitled Implementation of dispersion-free slow acoustic wave propagation and phase engineering with helical-structured metamaterials.
By designing the microstructure as a basic structural unit, the super-structured material can realize peculiar physical properties (such as negative refraction and super-large refractive index) that are not possessed by natural materials, and has tremendous potential in the fields of electromagnetics, optics, acoustics, and information and energy. Application prospects. How to effectively slow down the wave propagation speed, realize the control of the wave phase, and enhance the interaction between the wave and the material has always been a hot front topic in the fields of electronics, optics, and acoustics. The methods proposed in the past for slowing the beam are mostly based on the dispersion of the material or the local resonance of the structure, so these methods are only suitable for a very narrow band range. The spiral superstructure material proposed in the article realizes ultra-high equivalent refractive index through the rotation of the wavefront during propagation, which greatly slows down the beam. This method does not involve the dispersion of the material and the resonance of the structure, so that it can work in a wide frequency range. At the same time, by fine-tuning the helicity of the basic structural unit, it is easy to control the phase of the wave in the range of 0 to 2p. Using the array formed by the super-structured material, the self-accelerating non-diffractive beam was successfully experimentally realized.
Zhang Peng's research team mainly conducts related research work in the field of beam control, nanophotonics, and optical microscopy imaging. His main research direction has been supported by a project funded by the National Natural Science Foundation of China.
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