Arrays of photon-counting Geiger-mode avalanche photodiodes (APDs) sensitive to 1.06 and 1.55 µm wavelengths and as large as 256 x 64 elements on 50 µm pitch have been fabricated for defense applications. As array size, and element density increase, optical crosstalk becomes an increasingly limiting source of spurious counts. We characterize the crosstalk by measurement of emitted light, and by extracting the spatial and temporal focal plane array (FPA) response to the light from FPA dark count statistics. We discuss the physical and geometrical causes of FPA crosstalk, suggest metrics useful to system designers, then present measured crosstalk metrics for large FPAs as a function of their operating parameters. We then present FPA designs that suppress crosstalk effects and show more than 40 times reduction in crosstalk.
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机译：已为国防应用制造了对1.06和1.55 µm波长敏感，并以50 µm节距可多达256 x 64个元件的光子计数盖革模式雪崩光电二极管（APD）阵列。随着阵列尺寸和元件密度的增加，光学串扰已成为限制虚假计数的来源。我们通过测量发射光并通过从FPA暗计数统计中提取对光的时空焦平面阵列（FPA）响应来表征串扰。我们讨论了FPA串扰的物理和几何原因，提出了对系统设计人员有用的指标，然后提出了根据大型FPA的工作参数测得的串扰指标。然后，我们提出了FPA设计，该设计可以抑制串扰效应，并且可以减少40倍以上的串扰。
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