摘要
用n型掺杂GaAs和TiO2组成两个相同的光子晶体,并把它们串联成一个复合光子晶体。数值计算表明,复合光子晶体在0.1～6 THz的频段出现了数个相同的透射峰,这些透射峰有如下特征:当n型掺杂GaAs的掺杂浓度>1020/m3并继续增加时,从高频到低频各透射峰的透射率依次下降直至消失。当周期数变化时,透射峰的个数M和周期数N间满足关系式M=N-1,且N一定时,各透射峰的形状和中心间距相同。入射角增加时,各透射峰中心的移动很小,且入射角越大,各透射峰的半峰全宽度越窄。介质的几何厚度增加时,各透射峰的透射率和半峰全宽度不变,仅是其中心位置红移。这些现象为此复合光子晶体实现太赫兹频段的多通道滤波提供了理论指导。
Two of the same photonic crystal are composed of n-type doped GaAs and TiO2, and put them in series into a compound photonie crystal. Numerical calculations show that there are some same transmission peaks in the frequency band of 0. 1-6THz for the compound photonic crystal , these transmission peaks have the following characteristics： When the n-type doping of GaAs doping concentration 〉 102~/m3 and continue to increase, the transmittance of transmission peak that frequency from high to low decline followed and until disappears. When the number of cycles change, the number of transmission peaks M and the number of cycles N satisfy the relation M = N - 1, and N is constant, the shape of the transmission peaks and the center spacing are the same respectively. When angle of incidence increases, the amount of movement center of transmission peaks is small, and the angle of incidence is the greater, the more narrow full-width half- maximum of transmission peak. When the geometric thickness of the medium increases, the transmittance and full- width half- maximum of the transmission peaks remains the same, but its central position is only red shift. It provides theoretical guidance for the compound photonie crystal achieve terahertz band multi-channel filtering.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第3期537-542,共6页
Journal of Synthetic Crystals
基金
湖北省教育厅科学技术研究项目(Q20122307)
关键词
掺杂半导体
复合光子晶体
太赫兹
多通道滤波器
doped semiconductor
compound photonie crystal
terahertz
multi-channel filter
