A Micro-Machined Optical Fiber Cantilever as a Miniaturized pH Sensor


A micro-cantilever fabricated using a combination of picosecond-laser machining and centered ion beam milling directly onto the end of a commonplace telecommunications optical fiber is demonstrated as a liquid pH sensor. Typical pH meters sometimes require comparatively large reaction volumes up to ~fifty mL, which is not always convenient. The micro-scale nature of this sensor offers the potential for pH measurement on a smaller sample volume down to micro-liter. The fiber end-tip cantilever is coated with a pH sensitive layer, and also the pH-induced deflection is monitored interfermetically. A detectable pH range from to 10.0 is demonstrated for the cantilevers coated with 16-mercapto-hexadecanoic-1-acid as the practical layer, and a detectable pH range from four.0 to is demonstrated for the cantilevers coated with Al2O3 as the useful layer.

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