China＇s trade surplus will top US$100 billion in the first half of the year, up 60% on the same period of last year, ananalyst with the General Administration of Customs told Xinhua.
In this paper,elastic metasurfaces composed of zigzag units are proposed to manipulate flexural waves at a deep subwavelength scale.Through the parameter optimization of the genetic algorithm,units with full transmiss...In this paper,elastic metasurfaces composed of zigzag units are proposed to manipulate flexural waves at a deep subwavelength scale.Through the parameter optimization of the genetic algorithm,units with full transmission and full phase control can be found,while the width is only one-fifth of the wavelength.The outstanding capability of the units is explained by analyzing.their wave fields.The flat and the curved metasurfaces for focusing are designed and simulated,showing excellent performance.Experimental results of the flat metasurface show that the incident wave energy at the focal point is enhanced over 6 times,verifying the simulation results.The proposed metasurfaces could be useful in the design of.compact and efficient elastic devices.展开更多
文摘China＇s trade surplus will top US$100 billion in the first half of the year, up 60% on the same period of last year, ananalyst with the General Administration of Customs told Xinhua.
基金supported by the National Natural Science Foundation of China(Grant Nos.12072223,12122207,12021002,11991031,and 11991032)Y.-F.Wang also acknowledges support by the Natural Science Foundation of Tianjin(Grant No.20JCQNJC01030).
文摘In this paper,elastic metasurfaces composed of zigzag units are proposed to manipulate flexural waves at a deep subwavelength scale.Through the parameter optimization of the genetic algorithm,units with full transmission and full phase control can be found,while the width is only one-fifth of the wavelength.The outstanding capability of the units is explained by analyzing.their wave fields.The flat and the curved metasurfaces for focusing are designed and simulated,showing excellent performance.Experimental results of the flat metasurface show that the incident wave energy at the focal point is enhanced over 6 times,verifying the simulation results.The proposed metasurfaces could be useful in the design of.compact and efficient elastic devices.
