Design of a one-dimensional photonic crystal for the modification of BaF₂ scintillation spectrum

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• 作者：Wu ; Yonggang ; Gu ; Mu ; Cao ; Erhua ; Xun ; Rongkun ; Chen ; Lingyan
• 关键词：29.40.Mc ; 42.70.Qs ; 81.15.Ef ; BaF₂ scintillator ; Spectrum modification ; Photonic crystal
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2003
• 出版时间：January 1, 2003
• 年：2003
• 卷：496
• 期：1
• 页码：129-137
• 全文大小：1.27 M

文摘

One-dimensional metallic–dielectric photonic crystal (PC) was proposed to modify the scintillation spectrum of BaF₂ crystal. For the PC of several periods of Al₂O₃/MgF₂/Al/MgF₂, the photonic band of the PC and the corresponding scintillation spectrum of the BaF₂ crystal as the functions of geometrical parameters and incident angles were discussed. The band structure of the PC was optimized to achieve high transmittance for the fast emission and deep rejection for the slow emission of the BaF₂ crystal. Results show that the relative suppression ratio of the slow to the fast emission reaches 50 and simultaneously the fast emission is greater than 33.3 % that of the un-modified BaF₂.