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Waveguide-enhanced Raman spectroscopy of trace chemical warfare agent simulants

机译:痕量化学战争模拟剂的波导增强拉曼光谱

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We report the measurement of waveguide-enhanced Raman spectra from trace concentrations of four vapor-phase chemical warfare agent simulants: dimethyl methylphosphonate, diethyl methylphosphonate, trimethyl phosphate, and triethyl phosphate. The spectra are obtained using highly evanescent nanophotonic silicon nitride waveguides coated with a naturally reversible hyperbranched carbosilane sorbent polymer and exhibit extrapolated one-sigma detection limits as low as 5 ppb. We use a finite-element model to explain the polarization and wavelength properties of the differential spectra. In addition, we assign spectral features to both the analyte and the sorbent, and show evidence of changes to both due to hydrogen bonding. (C) 2018 Optical Society of America
机译:我们报告了从痕量浓度的四种气相化学战争试剂模拟物中的波导增强拉曼光谱的测量:二甲基磷酸,甲基膦酸二乙基磷酸二乙基磷酸酯和三乙基磷酸酯。 使用具有天然可逆的超支化的碳硅烷吸附剂聚合物的高渐逝纳光源氮化硅波导来获得光谱,并且表现出低至5ppb的外推的单σ检测限。 我们使用有限元模型来解释差分光谱的极化和波长特性。 此外,我们为分析物和吸附剂分配光谱特征,并显示由于氢键引起的变化的证据。 (c)2018年光学学会

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