报告题目:Resonance in bubbly media and metamaterials

报告人：Hyundae Lee教授

报告时间：14:30 – 15:30

报告地点：教师活动中心

报告人：Hyundae Lee教授 (Inha University)

报告时间：2019年1月10日（周四）14:30 – 15:30

报告地点：教师活动中心

报告人简介：Hyundae Lee教授现任韩国仁荷大学大学终身教授。研究领域偏微分方程反问题，渐进分析，谱分析，复合材料等。参考个人主页：http://people.math.inha.ac.kr/~hdlee/

Title: Resonance in bubbly media and metamaterials

Abstract: The study of metamaterials has drawn increasing interest nowadays because of their many important applications in fields such as super-resolution, cloaking, and novel optic and phononic devices. The bubbly media, because of the simplicity of the acoustic properties of the air bubbles, becomes a natural model for such study. It is known that a single bubble in the water possesses a quasi-static resonance which is called the Minneart resonance. Our analysis shows that near and below the Minneart resonant frequency, the effective media has high refractive index, which explains the super-focusing phenomenon observed in the experiment while near and above the Minneart resonant frequency, the effective media is dissipative. We also present some works on bubbly meta-surface which is a homogenization theory for a thin layer of periodically arranged bubbles mounted on a perfect reflection surface.