TY - JOUR
T1 - Light extraction enhancement and directional control of scintillator by using microlens arrays
AU - Chen, Xueye
AU - Liu, Bo
AU - Zhu, Jingtao
AU - Gu, Mu
AU - Chen, Hong
AU - Liu, Jinliang
AU - Chen, Liang
AU - Ouyang, Xiaoping
N1 - Publisher Copyright:
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
PY - 2018/9/3
Y1 - 2018/9/3
N2 - The total internal reflection restricts light extraction efficiency of scintillator, leading to reduced detection efficiency and signal-to-noise ratio in the field of scintillator-based radiation detection system. This research presents the method of applying microlens arrays to improve the light extraction efficiency as well as achieve directional control of emission for scintillators. For BGO (Bi4Ge3O12) scintillator covered with PMMA (polymethyl-methacrylate) hemispherical microlens array, the 2.59-fold in particular angle (θem = 45°) and overall 1.94-fold angle-integrated enhancement ratios have been obtained. Furthermore, we analyze and optimize some parameters of microlens arrays such as the packing arrangement, duty ratio, size, refractive index, and shape. As a result, when the refractive index of microlens is slightly larger than that of scintillator, a maximum 6.23-fold angle-integrated enhancements can be achieved. It can be concluded that the microlens array covered on scintillator has considerable value for practical applications on radiation detection.
AB - The total internal reflection restricts light extraction efficiency of scintillator, leading to reduced detection efficiency and signal-to-noise ratio in the field of scintillator-based radiation detection system. This research presents the method of applying microlens arrays to improve the light extraction efficiency as well as achieve directional control of emission for scintillators. For BGO (Bi4Ge3O12) scintillator covered with PMMA (polymethyl-methacrylate) hemispherical microlens array, the 2.59-fold in particular angle (θem = 45°) and overall 1.94-fold angle-integrated enhancement ratios have been obtained. Furthermore, we analyze and optimize some parameters of microlens arrays such as the packing arrangement, duty ratio, size, refractive index, and shape. As a result, when the refractive index of microlens is slightly larger than that of scintillator, a maximum 6.23-fold angle-integrated enhancements can be achieved. It can be concluded that the microlens array covered on scintillator has considerable value for practical applications on radiation detection.
UR - https://www.scopus.com/pages/publications/85052693699
U2 - 10.1364/OE.26.023132
DO - 10.1364/OE.26.023132
M3 - 文章
C2 - 30184968
AN - SCOPUS:85052693699
SN - 1094-4087
VL - 26
SP - 23132
EP - 23141
JO - Optics Express
JF - Optics Express
IS - 18
ER -