Thermal and mechanical characterizations of a substrate-free focal plane array

• Published in: Chinese physics B 2010, Vol.19 (1), p.222-233
• Main Author: 程腾 张青川 陈大鹏 史海涛 高杰 钱剑 伍小平
• Format: Article
• Language: English
• Subjects: Arrays; Energy conversion efficiency; Finite element method; Focal plane; Frames; Heat transfer; Infrared detectors; Mathematical analysis; Noise equivalent temperature difference; Pixels; Thermal conductivity; 噪声等效温差; 支撑框架; 有限元分析; 热传导率; 焦平面阵列; 能量转换效率
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/1/010701

We propose a substrate-free focal plane array （FPA） and the microcantilevers extend from a supporting frame. in this paper. The solid substrate is completely removed, Using finite element analysis, the thermal and mechanical characterizations of the substrate-free FPA are presented. Because of the large decrease in thermal conductance, the supporting frame is temperature dependent, which brings out a unique feature： the lower the thermal conductance of the supporting frame is, the higher the energy conversion efficiency in the substrate-free FPA will be. The results from the finite element analyses are consistent with our measurements： two types of substrate-free FPAs with pixel sizes of 200×200 and 60×60 um^2 are implemented in the proposed infrared detector. The noise equivalent temperature difference （NETD） values are experimentally measured to be 520 and 300 mK respectively. Further refinements are considered in various aspects, and the substrate-free FPA with a pixel size of 30×30 um^2 has a potential of achieving an NETD value of 10 mK.