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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 0以上
The one-dimensional metal / dielectric photonic crystal is used to modify the scintillation spectrum of BaF2 crystal. The photonic crystal is formed by the period of Al2 O3 / MgF2 / Al / MgF2. The number of cycles, the thickness of the metal layer and the relative position in the low refractive index layer are discussed. The relationship between incident angle and photonic bandgap properties and the effect of their modification on the scintillation spectrum of BaF2 crystal show that the photonic crystal attenuates fast components less than 5 times and relatively slow components More than 20 times, using the appropriate detection angle, can make the relative inhibition of slow components increased to more than 10 0