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A type of compact solution concentration sensor based on a microfiber with a nanoscale-structured film is proposed and demonstrated experimentally.Additional loss at different solution concentrations is calculated by means of the three-dimensional finite-difference time-domain(3D-FDTD) method.The microfiber is fabricated by using the flame-heated scanning technique.Nanoscale-structured film is coated on the microfiber surface,which is assembled as a sensing unit.The sensitivity of this kind of sensor increases with the decreasing diameters of the microfiber.When the diameter of the microfiber is 2μm,a minimum concentration sensitivity of 1%(under450 s measuring time) is demonstrated in the experiment.Higher sensitivity can be attained when the solution concentration is higher.The sensing properties of this microfiber with the nanoscale-structured film may provide opportunities for new applications in optical sensing devices.
A type of compact solution concentration sensor based on a microfiber with a nanoscale-structured film is proposed and demonstrated experimentally. Additional loss at different solution concentrations is calculated by means of the three-dimensional finite-difference time-domain (3D-FDTD) method The microfiber is fabricated by using the flame-heated scanning technique. Nonoscale-structured film is coated on the microfiber surface, which is assembled as a sensing unit. The sensitivity of this kind of sensor increases with the decreasing diameters of the microfiber. the diameter of the microfiber is 2 μm, a minimum concentration sensitivity of 1% (under 450 s measuring time) is demonstrated in the experiment. Height sensing can be attained when the solution concentration is higher. Sensing properties of this microfiber with the nanoscale-structured film may provide opportunities for new applications in optical sensing devices.