Tapered optical fibers designed for surface plasmon resonance phase matching.
Tapered optical fibers designed for surface plasmon resonance phase matching.
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专为表面等离子体共振相位匹配而设计的锥形光纤。
DOI：
10.1021/la801953z
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Roper,DKeith
中科院分区：
文献类型：
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作者：
Yu,Yinni;Blake,Phillip;Roper,DKeith
将改进的两步化学蚀刻方法与预测蚀刻参数和光子-等离子体相位匹配的方程相结合，形成单模锥形光纤 (TOF)，以优化电磁场增强。相位匹配方程用于确定表面等离子体共振 (SPR) 最大化时 TOF 截止半径附近的入射角。轴对称杨-拉普拉斯方程用于预测通过化学蚀刻制造 TOF 时的入射角。通过两步蚀刻工艺实现了 20.0° 的最佳锥角、平均入射角 (81.6 ± 1.9)° 和 (80.0 ± 14.1) nm 的尖端直径。这些 TOF 特性最大限度地提高了 SPR 激发和场增强。所制造的 TOF 在 650 nm 波长下优化 SPR 激发的折射率为 1.343。
Combining a modified two-step chemical etch method with equations to predict etch parameters and photon-plasmon phase-matching resulted in single-mode tapered optical fibers (TOFs) to optimize electromagnetic field enhancement. The phase-matching equation was used to identify the angle of incidence near the TOF cutoff radius at which surface plasmon resonance (SPR) is maximized. The axisymmetric Young−Laplace equation was used to predict the angle of incidence from the fabrication of a TOF via chemical etching. An optimal cone angle of 20.0°, angles of incidence averaging (81.6 ± 1.9)°, and tip diameters of (80.0 ± 14.1) nm were achieved through a two-step etching process. These TOF characteristics maximize SPR excitation and field enhancement. The refractive index for optimized SPR excitation in the fabricated TOFs at a wavelength of 650 nm was found to be 1.343.