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Supported planar germanium waveguides for infrared evanescent-wave sensing

机译:支持的平面锗波导,用于红外e逝波感测

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We have fabricated miniature planar IR waveguides with thicknesses of 30-50 mu m, consisting of 12-mm long, 2-mm wide strips of Ge supported on ZnS substrates. Evidence for efficient propagation of broadband IR light through these waveguides is provided by the presence of characteristic high- and low-frequency optical cutoffs of Ge; by the observation of an oscillatory interference pattern in the transmittance spectrum, which exhibits a dependence on waveguide thickness and propagation angle that closely matches waveguide theory; and by the detection of strong evanescent-wave absorption from small (2 mm(2)) droplets of liquid, e.g., water, on the waveguide surface. As also predicted by theory, the surface sensitivity (detected light absorbance per unit area of sample-waveguide contact) is shown to increase as a function of incidence or bevel angle. (C) 1997 Optical Society of America.
机译:我们制造了厚度为30-50微米的微型平面IR波导,该波导由支撑在ZnS衬底上的12毫米长,2毫米宽的Ge条带组成。 Ge的特征高频和低频光学截止的存在为宽带红外光通过这些波导的有效传播提供了证据。通过观察透射光谱中的振荡干涉图,它显示出对波导厚度和传播角度的依赖性,这与波导理论非常吻合。并通过从波导表面上的小水滴(例如2 mm(2))液滴(例如水)中检测到强的van逝波吸收进行检测。正如理论所预测的那样,表面灵敏度(样本波导接触件的每单位面积检测到的吸光度)显示为入射角或斜角的函数。 (C)1997年美国眼镜学会。

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