Author Affiliations
Abstract
1 Telecommunication T/R Section, Zhenjiang Watercraft College, Zhenjiang 212003
2 Institute of Applied Physics, Jiangsu University, Zhenjiang 212013
3 Department of Electronic Engineering, East China Normal University, Shanghai 200062
4 Department of Telecommunication Engineering, Jiangsu University, Zhenjiang 212013
Localized fields in the defect mode of one-dimensional photonic crystals with active impurity are studied with the help of the theory of spontaneous emission from two-level atoms embedded in photonic crystals. Numerical simulations demonstrate that the enhancement of stimulated radiation, as well as the phenomena of transmissivity larger than unity and the abnormality of group velocity close to the edges of photonic band gap, are related to the negative imaginary part of the complex effective refractive index of doped layers. This means that the complex effective refractive index has a negative imaginary part, and that the impurity state with very high quality factor and great state density will occur in the photonic forbidden band if active impurity is introduced into the defect layer properly. Therefore, the spontaneous emission can be enhanced, the amplitude of stimulated emission will be very large and it occurs most probably close to the edges of photonic band gap with the fundamental reason, the group velocity close to the edges of band gap is very small or abnormal.
自发辐射 激活杂质 光增益 130.3120 Integrated optics devices 120.7000 Transmission 160.4670 Optical materials 120.4570 Optical design of instruments 160.5690 Rare-earth-doped materials 230.4170 Multilayers Chinese Optics Letters
2007, 5(12): 696
1 镇江船艇学院，江苏 镇江 212003
2 江苏大学通信工程系，江苏 镇江 212013
3 江苏大学 物理系，江苏 镇江 212013
4 江苏大学应用物理研究所，江苏 镇江 212013
借助光子晶体中二能级原子的自发辐射理论证明缺陷态的局域场存在的必然性以及局域场基本性质，为研究光子晶体光纤掺杂自发辐射的内在规律提供了理论依据。且将自发辐射理论与数值模拟相结合，在缺陷介质中掺激活杂质时，研究了光子晶体光纤的掺杂局域场特征以及受激辐射增强和透射率大于1现象与光子带隙群速度异常和掺杂层复有效折射率成负的虚部之间的内在关系。由此说明光子晶体光纤的缺陷介质中掺入激活杂质时，光子禁带中能出现品质因子非常高的杂质态，具有很大的态密度，较强的受激辐射放大。
光子晶体 光子晶体光纤 自发辐射 光子禁带 激活杂质 光增益 photonic crystals photonic crystal fibers spontaneous emission photonic band gaps active impurity optical gain
1 连云港师范高等专科学校物理系, 江苏 连云港 222006
2 江苏大学应用物理研究所, 江苏 镇江 212003
3 镇江船艇学院基础系, 江苏 镇江 212003
把多重散射(Order-N)方法用于二维光子晶体组成异质结的传输特性研究,分别数值研究了折射率异质结、柱体形状异质结、晶格结构异质结三种情况下的透射特性,数值结果指出在折射率异质时出现类似于电子型半导体的单向导光性能,并作了简单理论类比分析。 进一步对三种异质结进行研究,得出传导模的出现不只是晶格结构畸变一种情况可以产生,其他两种异质结也能产生传导模。
光电子学 二维光子晶体异质结 多重散射法 禁带 传导模
1 江苏大学物理系,镇江,212003
2 江苏大学通信系,镇江,212013
3 江苏大学应用物理研究所,镇江,212003
4 镇江船艇学院基础系,镇江,212003
本文在描述普通光纤光孤子传输的行为基础上,提出纳米光纤概念,重点讨论了纳米光纤量子点制备和纳米光纤的分布式光放大的等效增益形成机制以建立的全新光孤子光通信系统.
纳米光纤 分布式光放大 等效增益 光孤子通信 nanofiber distributing light amplification equivalency gain optic soliton communication
