摘要
利用一维金属 /介质光子晶体对BaF2 晶体闪烁光谱进行修饰 以Al2 O3/MgF2 /Al/MgF2为周期构成光子晶体 ,讨论了周期数、金属层的厚度以及在低折射率层中的相对位置、入射角度等与光子晶体能带特性的关系及其对BaF2 晶体闪烁光谱进行修饰的效果 结果表明 ,在所考虑的发射角范围 ,光子晶体对快成分的衰减小于 5倍 ,对慢成分的相对抑制比超过 2 0倍 ,采用合适的探测角度 ,可使对慢成分的相对抑制比提高到 10
One dimensional photonic crystal was proposed to modify the emission spectrum of BaF2 scintillation crystal. The photonic crystal was composed of the basic unit, Al2O3/MgF2/Al/MgF2. The transmittance spectrum of the photonic crystal and the relevant emission spectrum of the BaF2 were discussed with relation to period number, metallic layer thickness and its position in the low refractive index material, emission angle etc. Results show that the attenuation of the fast component is less than 5 times and the relative restraint ratio of the slow component is larger than 20 with the designed photonic crystal. The relative restraint ratio of the slow component can be larger than 100 by selecting appropriate detect angle range.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2005年第1期94-97,共4页
Acta Photonica Sinica
基金
国家自然科学基金资助项目 (10 175 0 4 9)
关键词
光子晶体
BaF2闪烁晶体
光谱修饰
Photonic crystal
BaF 2 scintillation crystal
Spectral modification
