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18 March 2016 Silicon chip integrated photonic sensors for biological and chemical sensing
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We experimentally demonstrate applications of photonic crystal waveguide based devices for on-chip optical absorption spectroscopy for the detection of chemical warfare simulant, triethylphosphate as well as applications with photonic crystal microcavity devices in the detection of biomarkers for pancreatic cancer in patient serum and cadmium metal ions in heavy metal pollution sensing. At mid-infrared wavelengths, we experimentally demonstrate the higher sensitivity of photonic crystal based structures compared to other nanophotonic devices such as strip and slot waveguides with detection down to 10ppm triethylphosphate. We also detected 5ppb (parts per billion) of cadmium metal ions in water at near-infrared wavelengths using established techniques for the detection of specific probe-target biomarker conjugation chemistries.
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Swapnajit Chakravarty, Yi Zou, Hai Yan, Naimei Tang, and Ray T. Chen "Silicon chip integrated photonic sensors for biological and chemical sensing", Proc. SPIE 9705, Microfluidics, BioMEMS, and Medical Microsystems XIV, 97050O (18 March 2016);

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