计算物理 ›› 2015, Vol. 32 ›› Issue (6): 722-728.

• 论文 • 上一篇    下一篇

声波在双层非线性介质中传播的二极管现象

郭凤丽1, 胡冬生1, 徐江2   

  1. 1. 南京航空航天大学理学院, 南京 211106;
    2. 南京航空航天大学材料学院, 南京 211106
  • 收稿日期:2014-10-20 修回日期:2015-03-09 出版日期:2015-11-25 发布日期:2015-11-25
  • 作者简介:郭凤丽(1987-),女,硕士,主要从事凝聚态物理研究
  • 基金资助:
    国家自然科学基金(11175086,51175245);江苏省自然科学基金(BK2010073)资助项目

Diode Phenomenon of Acoustic Wave Propagation in a Two-Layer Nonlinear System

GUO Fengli1, HU Dongsheng1, XU Jiang2   

  1. 1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
    2. Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
  • Received:2014-10-20 Revised:2015-03-09 Online:2015-11-25 Published:2015-11-25
  • Contact: 胡冬生,E-mail:dongshenghu@nuaa.edu.cn,电话:13218037266

摘要: 假设声波在双层一维非线性系统中传播时线性部分满足波动方程,非线性部分类似于非线性薛定谔方程的非线性部分.对该模型正反两个方向分别入射相同的声波计算透射率发现:一定频率及强度的声波在模型中具有单向透过性,表现出声二极管的行为;随着非线性强度差异的增强,单向导通性显著提高.

关键词: 非线性系统, 声波, 整流, 二极管

Abstract: In one-dimensional nonlinear system, linear parts of acoustic wave meet wave equation and nonlinear part is assumed similar to that of nonlinear Schrödinger equation. Transmission coefficients of two incident acoustic waves from opposite directions are calculated respectively. It is shown that this model has unidirectional penetrability for acoustic wave within certain frequency and amplitude, and expresses behaviors of diode. Increasing nonlinear intensity leads to a remarkable enhancement of unidirectional penetrability.

Key words: nonlinear system, acoustic wave, rectification, diode phenomenon

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