Ratiometric,filter-free optical sensor based on a complementary metal oxide semiconductor buried double junction photodiode |
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| Authors: | Ka Yi Yung Zhiyong Zhan Albert H. Titus Gary A. Baker Frank V. Bright |
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| Affiliation: | 1. Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA;2. Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA;3. Department of Chemistry, University of Missouri, Columbia, MO 65211-7600, USA |
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| Abstract: | We report a complementary metal oxide semiconductor integrated circuit (CMOS IC) with a buried double junction (BDJ) photodiode that (i) provides a real-time output signal that is related to the intensity ratio at two emission wavelengths and (ii) simultaneously eliminates the need for an optical filter to block Rayleigh scatter. We demonstrate the BDJ platform performance for gaseous NH3 and aqueous pH detection. We also compare the BDJ performance to parallel results obtained by using a slew scanned fluorimeter (SSF). The BDJ results are functionally equivalent to the SSF results without the need for any wavelength filtering or monochromators and the BDJ platform is not prone to errors associated with source intensity fluctuations or sensor signal drift. |
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| Keywords: | BDJ, buried double junction CMOS IC, complementary metal oxide semi-conductor integrated circuit SSF, slew scan fluorimeter ([P14,666+]), trihexyl(tetradecyl)phosphonium cation HPTS3&minus , 8-hydroxypyrene-1,3,6-trisulfonate SNARF-1, seminaphthorhodamine-1 carboxylate |
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