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Graphene oxide coated side polished surface plasmon resonance optical fibre sensor with varying polishing losses

机译：具有变化的抛光损耗的氧化石墨烯涂层侧抛光表面等离振子共振光纤传感器

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摘要

Four batches of side-polished SMF optical fibres with different polishing losses, -0.5 dBm, -5 dBm, -10 dBm and -15 dBm were coated with a graphene oxide layer of similar to 0.5 mu m via drop casting. TE polarized light was propagated through the light during experiments and four different transformer oils with different water contents were dropped onto the sensor. The drop in the power of transmitted light was recorded. The responses of the sensors showed good linearity for all, but the least polished fibre showed the weakest response in terms of power drop towards change in concentration. The -5 dBm fibre showed the best response per unit concentration change. Additional tests showed the increased response for a GO coated side polished sensor compared to an uncoated side polished sensor. Simulation using COMSOL was performed to show the effects on the electric field of a sensor with and without GO coating. Another set of simulations were performed to show the effects of reducing cladding thickness on the coupling of the electric field. Simulations show that the optimal cladding thickness is not the most polished fibre, coinciding with our results that -15 dBm loss fibre did not show the most response per unit change in the analyte.
机译：通过滴铸法将四批具有不同抛光损耗（-0.5 dBm，-5 dBm，-10 dBm和-15 dBm）的SMF侧抛光SMF光纤涂上一层类似0.5微米的氧化石墨烯层。在实验期间，TE偏振光通过该光传播，并且将四种具有不同水含量的不同变压器油滴到传感器上。记录透射光的功率下降。传感器的响应对所有传感器都显示出良好的线性，但是抛光最少的光纤在针对浓度变化的功率下降方面显示出最弱的响应。 -5 dBm光纤显示出每单位浓度变化的最佳响应。其他测试显示，与未涂层的侧面抛光传感器相比，GO涂层的侧面抛光传感器的响应有所增加。进行了使用COMSOL的仿真，以显示对有和没有GO涂层的传感器电场的影响。进行了另一组模拟，以显示减小包层厚度对电场耦合的影响。仿真表明，最佳的包层厚度并不是抛光度最高的光纤，这与我们的结果一致，即损耗为-15 dBm的光纤在分析物中每单位变化的响应最大。

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