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负折射由滑动反射对称晶体接口指导

Yuzhong Zhou¹, Tian Sang¹, Yueke Wang¹

¹Optoelectronic Engineering and Technology Research Center, Jiangnan University, Wuxi 214122, China.

Materials (Basel, Switzerland)

|March 27, 2025

概括

这项研究引入了滑翔反射 (GR) 对称的音声晶体 (PC) 来实现超高分辨率声学镜片的负折射. 研究表明,在新型PC设计中,使用合边缘状态 (CES) 提高了负声折射.

科学领域:

声学声学在声学方面
凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学

背景情况:

具有负折射率的声波晶体 (PC) 是超高分辨率声学镜头的关键.
在声学系统中实现负折射是一个活跃的研究领域.

研究的目的:

为了呈现一个新的滑动反射 (GR) 对称的音声晶体 (PC) 设计.
用边缘状态 (ESs) 和合边缘状态 (CESs) 来证明负折射.
为设计声学负折射装置提供一种新方法.

主要方法:

GR对称音声晶体的设计.
通过万尼尔中心不匹配激发边缘状态 (ESs).
堆叠GR对称PC接口以形成合边缘状态 (CES).
有限元素方法 (FEM) 模拟用于验证.

主要成果:

由于GR对称PC中的Wannier中心不匹配,ESs的出现.
通过激发具有负分散的ESs来实现负折射.
从相邻的GR对称PC接口之间的合观察CES.
通过CESs表现出更强的负声折射与负横移.

结论:

拟议的GR对称PC结构有效实现负折射.
合边缘状态 (CES) 增强了负声折射效应.
这项工作为设计声学负折射和超高分辨率声学镜片提供了一种新的方法.

关键词:

滑翔-反射对称性滑翔-反射对称性有负折射的阴性折射.语音晶体的声音.

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