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In this chapter, a theory is provided to show that a structure with periodic vibration plates and side holes in an ordinary waveguide can realize an acoustic metamaterial with negative bulk modulus and negative mass density simultaneously. Through effective medium theory and transmission matrix theory, we explain the physical mechanism of the simultaneous negative bulk modulus and negative mass density. These characteristics applied to the frequencies lower than the critical frequency determined by vibration plates fVP shows left-handed properties. Above the critical frequency determined by side holes fSH, the medium is ordinary and shows right-handed properties. When the frequency is in the range fVP

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Reverse Excitation and Enhancement of Second Harmonics in Metamaterials

  • 章节

  • 发表日期：

    2025年

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  • Xiaozhou Liu

摘要

In this chapter, a theory is provided to show that a structure with periodic vibration plates and side holes in an ordinary waveguide can realize an acoustic metamaterial with negative bulk modulus and negative mass density simultaneously. Through effective medium theory and transmission matrix theory, we explain the physical mechanism of the simultaneous negative bulk modulus and negative mass density. These characteristics applied to the frequencies lower than the critical frequency determined by vibration plates fVP shows left-handed properties. Above the critical frequency determined by side holes fSH, the medium is ordinary and shows right-handed properties. When the frequency is in the range fVP