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- Title
Performance Optimization of InSb Infrared Focal-Plane Arrays with Diffractive Microlenses.
- Authors
Bai, Jie; Hu, Weida; Guo, Nan; Lei, Wen; Lv, Yanqiu; Zhang, Xiaolei; Si, Junjie; Chen, Xiaoshuang; Lu, Wei
- 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.
- Subjects
INDIUM antimonide; MICROLENSES; PHOTOSENSITIVE glass; FOCAL plane arrays sensors; QUANTUM efficiency
- Publication
Journal of Electronic Materials, 2014, Vol 43, Issue 8, p2795
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-014-3054-0