Effective zero index in locally resonant acoustic material

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• 作者：Xue-Feng Zhu ; ^{ernestzhu.nju@gmail.com}
• 关键词：Zero refractive index ; Locally resonant acoustic material ; High Q resonant cavity
• 刊名：Physics Letters A
• 出版年：2013
• 出版时间：30 October, 2013
• 年：2013
• 卷：377
• 期：31-33
• 页码：1784-1787
• 全文大小：1695 K

文摘

Here in locally resonant acoustic material, it is shown that effective zero refractive index can be constructed by the resonant unit-cells with coherent degenerate monopole-dipole momenta. Due to strong local resonances, the material layers with effective zero refractive index can function as a resonant cavity of high Q factor, where a subtle deviation from the resonant frequency may result in distinct increase of reflection. Full-wave simulations are performed to demonstrate some unusual wave transport properties such as invisibility cloaking, super-reflection, local field enhancement, and wavefronts rotation.