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Physical characteristics of localized surface plasmons resulting from nano-scale structured multi-layer thin films deposited on D-shaped optical fiber

机译:D形光纤上沉积的纳米级多层薄膜产生的局部表面等离子体激元的物理特性

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摘要

Novel surface plasmonic optical fiber sensors have been fabricated using multiple coatings deposited on a lapped section of a single mode fiber. UV laser irradiation processing with a phase mask produces a nano-scaled surface relief grating structure resembling nano-wires. The resulting individual corrugations produced by material compaction are approximately 20 μm long with an average width at half maximum of 100 nm and generate localized surface plasmons. Experimental data are presented that show changes in the spectral characteristics after UV processing, coupled with an overall increase in the sensitivity of the devices to surrounding refractive index. Evidence is presented that there is an optimum UV dosage (48 joules) over which no significant additional optical change is observed. The devices are characterized with regards to change in refractive index, where significantly high spectral sensitivities in the aqueous index regime are found, ranging up to 4000 nm/RIU for wavelength and 800 dB/RIU for intensity.
机译:已经使用沉积在单模光纤的重叠部分上的多个涂层来制造新型表面等离子光纤传感器。用相位掩模进行UV激光辐照处理可产生类似于纳米线的纳米级表面起伏光栅结构。通过材料压实产生的单个波纹约为20μm长,平均宽度的一半为最大值100 nm,并产生局部表面等离激元。呈现的实验数据显示了UV处理后光谱特性的变化,以及器件对周围折射率的敏感性总体提高。证据表明存在最佳紫外线剂量(48焦耳),在此剂量范围内未观察到明显的其他光学变化。该器件的特征在于折射率的变化,其中发现在水折射率范围内具有很高的光谱灵敏度,波长的范围高达4000 nm / RIU,强度的范围高达800 dB / RIU。

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