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A CMOS/Thin-Film Fluorescence Contact Imaging Microsystem for DNA Analysis

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6 Author(s)
Singh, R.R. ; Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada ; Ho, D. ; Nilchi, A. ; Gulak, P.G.
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A hybrid CMOS/thin-film microsystem for fluorescence contact imaging is presented. The microsystem integrates a high-performance optical interference filter and a 128 ?? 128 pixel active pixel sensor fabricated in a standard 0.35-??m CMOS technology. The thin-film filter has an optical density greater than 6.0 at the wavelength of interest, providing adequate excitation rejection to the 532-nm solid-state laser. Microsystem performance is experimentally validated by imaging spots of Cyanine-3 fluorophore, conventionally used in DNA detection. The emission intensity as a function of fluorophore concentration is measured with an estimated sensitivity of 5000 fluorophore/??m2 . A human DNA microarray has been imaged with the sensor prototype.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:57 ,  Issue: 5 )