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| 连续渐变周期的一维光子带隙结构全能反射器 | |
| 引用本文： | 汤亮,袁长胜,陈延峰,祝世宁.连续渐变周期的一维光子带隙结构全能反射器[J].光子学报,2004,33(5):573-576. |
| 作者姓名： | 汤亮 袁长胜 陈延峰 祝世宁 |
| 作者单位： | 南京大学材料科学与工程系,南京,210093;南京大学固体微结构物理国家重点实验室,南京,210093;南京大学固体微结构物理国家重点实验室,南京,210093 |
| 基金项目： | 江苏省科学基金资助项目 (BK1 9990 1 8) |
| 摘 要： | 采用转移矩阵法设计了一种具有连续渐变周期的一维光子带隙结构全能反射器,它在一般材料选取情况下(如TiO2/SiO2),在可见光区能达到几十甚至几百纳米量级的带隙宽度全向反射.研究表明,其带隙宽度随着周期数和渐变周期的大小改变而改变.当周期数不断增大时,带隙宽度不断增大;当渐变周期的大小在一定范围内不断增大时,带隙宽度同样不断增大.这主要是光波在各层之间的传播随着周期和渐变周期的大小不断增大而产生的相干散射和干涉效应不断增强所导致的. |
| 关 键 词： | 光子晶体 带隙 渐变周期 全能反射器 |
| 收稿时间： | 2003-04-21 |
| 修稿时间： | 2003年4月21日 |
A New Type of Omnidirectional Reflection:The One-dimensional Photonic Band Gap Structure with Gradual Periods |
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.A New Type of Omnidirectional Reflection:The One-dimensional Photonic Band Gap Structure with Gradual Periods[J].Acta Photonica Sinica,2004,33(5):573-576. |
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| Authors: | |
| Institution: | (1 Department of Material Science and Engineering, Nanjing University, Nanjing 210093) (2 The State Key Laboratory of Solid Microstructure Physics, Nanjing University, Nanjing 210093) |
| Abstract: | The one dimensional photonic band gap structure with gradual periods is designed as a new type of omnidirectional reflector with the transfer matrix method. And the structures have the excellent band gaps of several decades even hundreds of nanometers in the visible region under the choice of common materials (as TiO 2/SiO 2). Through analysis and investigation, it is discovered that the width of band gap in these structures increases simultaneously with the increase of the number of periods or the number the gradual periods to some extent. It is the factor of the enhancing effect of the coherent scattering and interference between layers. |
| Keywords: | Photonic crystal Band gap Gradual periods Omnidirectional reflector |
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