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A Transflective Nano-Wire Grid Polarizer Based Fiber-Optic Sensor

机译:基于透反射纳米线网格偏振器的光纤传感器

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摘要

A transflective nano-wire grid polarizer is fabricated on a single mode fiber tip by focused ion beam machining. In contrast to conventional absorptive in-line polarizers, the wire grids reflect TE-mode, while transmitting TM-mode light so that no light power is discarded. A reflection contrast of 13.7 dB and a transmission contrast of 4.9 dB are achieved in the 1,550 nm telecom band using a 200-nm wire grid fiber polarizer. With the help of an optic circulator, the polarization states of both the transmissive and reflective lights in the fiber may be monitored simultaneously. A kind of robust fiber optic sensor is thus proposed that could withstand light power variations. To verify the idea, a fiber pressure sensor with the sensitivity of 0.24 rad/N is demonstrated. The corresponding stress-optic coefficient of the fiber is measured. In addition to pressure sensing, this technology could be applied in detecting any polarization state change induced by magnetic fields, electric currents and so on.
机译:通过聚焦离子束加工,在单模光纤尖端上制作了透反射纳米线栅偏振器。与传统的吸收式在线偏振器相反,线栅反射TE模式,同时透射TM模式光,因此不会浪费任何光功率。使用200 nm线栅光纤偏振器在1,550 nm的电信频段中实现了13.7 dB的反射对比度和4.9 dB的传输对比度。借助于光学环行器,可以同时监视光纤中的透射光和反射光的偏振状态。因此,提出了一种可以抵抗光功率变化的坚固的光纤传感器。为了验证该想法,演示了灵敏度为0.24 rad / N的光纤压力传感器。测量纤维的相应应力-光学系数。除压力感测外,该技术还可用于检测由磁场,电流等引起的任何极化状态变化。

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