Improving the light energy utilization of avalanche photodiode array detector by using micro compound parabolic concentrator array

Yuan Huang, Xiaoyu Ma, Changhui Rao Improving the light energy utilization of avalanche photodiode array detector by using micro compound parabolic concentrator array (Улучшение эффективности использования световой энергии матрицей лавинных фотодиодов с помощью массива малоразмерных параболических концентраторов) [на англ. яз.] // Оптический журнал. 2019. Т. 86. № 10. С. 48–53. http://doi.org/10.17586/1023-5086-2019-86-10-48-53

Yuan Huang, Xiaoyu Ma, Changhui Rao Improving the light energy utilization of avalanche photodiode array detector by using micro compound parabolic concentrator array (Улучшение эффективности использования световой энергии матрицей лавинных фотодиодов с помощью массива малоразмерных параболических концентраторов) [in English] // Opticheskii Zhurnal. 2019. V. 86. № 10. P. 48–53. http://doi.org/10.17586/1023-5086-2019-86-10-48-53

Yuan Huang, Xiaoyu Ma, and Changhui Rao, "Improving the light energy utilization of an avalanche photodiode array detector by using a micro compound parabolic concentrator array," Journal of Optical Technology. 86(10), 642-646 (2019). https://doi.org/10.1364/JOT.86.000642

Avalanche photodiode array detector consists of photosurface and dead zone. Photosurface is the area where the photoelectric effect occurs, while dead zone is useless to detection and reduces the light energy utilization of the detector. Generally, by coupling a microlens array can solve this problem. However, when the detected target moves, a part of the light concentrated by lens will deviate from the photosurface to the dead zone, which results in a loss of energy. We design a micro compound parabolic concentrator array to replace the traditional microlens array. Having a large acceptance angle, the compound parabolic concentrator can concentrate light beam with incident angle smaller than the acceptance angle. Even if the incident light is deviated by a certain angle, most of the light can effectively be concentrated onto the photosurface as long as the deviate angle is smaller than the acceptance angle. Hence, it has higher light energy utilization than microlens array.