An integrated optoelectronic chip for sensing aromatic hydrocarbon contaminants in groundwater
نویسنده
چکیده
The local evanescent array coupled (LEAC) chip-scale sensor is demonstrated for rapid detection of benzene, toluene and xylenes (BTX) in water at sub-ppm concentrations with minimal sample preparation. BTX analytes are found to concentrate into the chip’s Teflon AF upper cladding sensing region, causing an increase in refractive index, which modulates evanescent coupling into the chip’s integrated photodetector array. Integration of the photodetector array simplifies system instrumentation and permits incorporation of an on-chip photocurrent reference region in the immediate vicinity of the sensing region, romatic hydrocarbon sensing
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