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Proceedings Paper

High-sensitivity 25μm and 50μm pitch microcantilever IR imaging arrays
Author(s): Scott R. Hunter; Gregory S. Maurer; Gregory Simelgor; Shankar Radhakrishnan; John Gray
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Paper Abstract

This paper reports on the development of small pixel pitch infrared FPAs based on the capacitively read bimorph microcantilever sensor technology. The heat sensing bimorph microcantilever structures are fabricated directly onto the CMOS control and amplification electronics to produce a high performance, low cost imager that is compatible with standard silicon IC foundry processing and materials. Positional responsivities of greater than 0.3 μm/K have been modeled and measured for 50 μm pitch pixels, corresponding to a temperature coefficient of capacitance, &Dgr;C/C, (equivalent to TCR for microbolometers) above 30%/K. This responsivity, along with noise capacitances in the sub-attofarad range and nominal sensor capacitances of 15 fF, give modeled NEDT < 20 mK for these devices. At smaller pixel pitches, the positional responsivity decreases rapidly with feature size resulting in increased system NEDTs. Modeling the performance of microcantilever based IR sensors with innovative sensor structures and pixel pitches down to 17 μm indicates NEDTs < 20 mK and thermal time constants in the 5 msec range, are feasible with this technology. Results from detailed thermo-electro-opto-mechanical modeling of the operation of the 25 μm pitch pixels are presented.

Paper Details

Date Published: 14 May 2007
PDF: 13 pages
Proc. SPIE 6542, Infrared Technology and Applications XXXIII, 65421F (14 May 2007); doi: 10.1117/12.726316
Show Author Affiliations
Scott R. Hunter, Multispectral Imaging, Inc. (United States)
Gregory S. Maurer, Multispectral Imaging, Inc. (United States)
Gregory Simelgor, Multispectral Imaging, Inc. (United States)
Shankar Radhakrishnan, Multispectral Imaging, Inc. (United States)
John Gray, Multispectral Imaging, Inc. (United States)

Published in SPIE Proceedings Vol. 6542:
Infrared Technology and Applications XXXIII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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