Microconcentrators to recover fill-factor in image photodetectors with pixel on-board processing circuits
Microconcentrators to recover fill-factor in image photodetectors with pixel on-board processing circuits
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DOI：
10.1364/oe.15.018066
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发表时间：
2007-12-24
期刊：
影响因子：
3.8
通讯作者：
Norgia, Michele
中科院分区：
文献类型：
--
作者：
Donati, Silvano;Martini, Giuseppe;Norgia, Michele
我们提出了一种非成像微聚光器阵列作为一种手段来恢复由于面积填充因子造成的灵敏度损失。这对于其中需要复杂电路功能并且消耗相当一部分像素区域的图像光电检测器尤其重要，例如3D相机、SPAD阵列、荧光分析器等，但在CMOS传感器中也是如此。到目前为止，低填充系数是一种不可接受的灵敏度损失，排除了这种装置的开发，而通过使用聚光器阵列，恢复是可能的，直到物镜数值孔径的倒数平方。用光线追迹法计算了非成像聚光器的几种几何形状，即截锥面、抛物面和复合抛物面，以及反射面和折射面的聚光系数。论证了大量回收填充因数(高达50)的可行性。(C)2007年美国光学学会。
We propose an array of non-imaging micro-concentrators as a mean to recover the loss of sensitivity due to area fill-factor. This is particularly important for those image photo detectors in which complex circuit functions are required and a substantial fraction of the pixel area is consumed, like e. g., 3D camera, SPAD arrays, fluorescence analyzers, etc., but also in CMOS sensors. So far, the low fill-factor was an unacceptable loss of sensitivity precluding from the development of such devices, whereas by using a concentrator array a recovery is possible, up to the inverse square of numerical aperture of the objective lens. By ray tracing, we calculate the concentration factors of several geometries of non-imaging concentrator, i.e., truncated cone, parabolic and compound parabolic, both reflective and refractive. The feasibility of a sizeable recovery of fill-factor (up to 50) is demonstrated. (c) 2007 Optical Society of America.