非线性负折射材料中超短脉冲三波耦合特性研究

项目名称： 非线性负折射材料中超短脉冲三波耦合特性研究

项目编号： No.61308005

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 陈英

作者单位： 长沙学院

项目金额： 25万元

中文摘要： 负折射材料是一种人工微结构材料，其电磁和光学特性可人为设计。与常规光学材料相比，它对光有磁响应特性，具有色散磁导率，同时对一定带宽范围内的光有负的折射率。本项目研究超短脉冲在负折射材料中三波非线性耦合的特性，建立物理意义清晰、数学形式简洁的三波耦合理论模型,揭示超短脉冲在不同折射率区非线性耦合的特性和规律；特别是发现因负折射材料的磁响应特性导致的三波非线性耦合的新现象和新效应，并解释其物理原因。在此基础上，探索在负折射材料中有效实现三波耦合的方法和手段。该项目的完成将加深对负折射材料中超短脉冲传输的复杂特性和规律的认识和理解，同时为发展基于非线性负折射材料奇异特性（如波的反向传输，非线性系数的大小和符号可控等）的应用（如频率转换、光参量放大等）奠定理论基础。

中文关键词： 非线性光学；超短脉冲；负折射材料；三波耦合；

英文摘要： Negative-index material (NIM) is a kind of artifical matematerial, which the optical and electromagnetic properties are controllable according to people's purpose. Different from the conventional optical material, the refractive indice of NIM is negative at a certain range of wavelengths, moreover, it has magnetic response to optical waves, namely, it has the permeability (μ = μ(ω)). This project will discuss the coupling properties of three ultrashort pulses propagating in nonlinear NIM. We will establish a theoretical model to describe the three-wave coupling process with distinct physcial significance and concise mathematical form at first. Using this model, the specificities and laws of ultrafast three-wave coupling in different area will be revealed, respectively. Especially, we will foucs on the new nonlinear phenomena and effects of three-wave coupling in the ninlinear NIM caused by the dispersive permeability, and we will explain the phycial reasons. This project will help us understanding of the complex properties and laws of ultrashort pulses propagating in NIM, futhermore, it will lay the theoretical foudation for the application (such as frequency converter, optical parametric amplificater, etc) of nonlinear NIM.

英文关键词： nonlinear optics；ultrashort pulse；negative-index material；three-wave coupling；