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Performance Optimization of InSb Infrared Focal-Plane Arrays with Diffractive Microlenses |
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| Authors: | Jie Bai Weida Hu Nan Guo Wen Lei Yanqiu Lv Xiaolei Zhang Junjie Si Xiaoshuang Chen Wei Lu |
| Affiliation: | 1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China 2. School of Electrical, Electronic and Computer Engineering, University of Western Australia, Crawley, WA, 6009, Australia 3. Luoyang Optoelectronic Institute, Luoyang, 471009, Henan, China |
| Abstract: | In this paper, diffractive microlens arrays are studied to concentrate incident light onto the effective photosensitive area of InSb infrared focal-plane arrays and thus enhance the quantum efficiency and reduce the crosstalk. Four designs of diffractive microlenses are investigated by a phase-matched Fresnel-elements approach. The quantum efficiency and crosstalk of the devices are calculated by using a two-dimensional device simulation with unit cell of 50 μm. Light propagation through the diffractive microlenses is simulated by the finite-difference time-domain method based on a rigorous vector solution of Maxwell’s equations. The results show that the highest quantum efficiency of the device with a diffractive microlens array is about 51.6% and the corresponding crosstalk is 5.06%. The quantum efficiency is 2.1% higher than that of the device with a spherical refractive microlens array. |
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