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首页> 外文期刊>Optics Letters >Composite optical waveguide composed of a tapered film of bromothymol blue evaporated onto a potassium ion-exchanged waveguide and its application as a guided wave absorption-based ammonia-gas sensor
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Composite optical waveguide composed of a tapered film of bromothymol blue evaporated onto a potassium ion-exchanged waveguide and its application as a guided wave absorption-based ammonia-gas sensor

机译：由溴化百里酚蓝的锥形膜蒸发到钾离子交换波导上组成的复合光波导及其在基于导波吸收的氨气传感器中的应用

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摘要

For what is the first time to our knowledge, we have successfully evaporated a tapered film of bromothymol blue (BTB) onto a potassium ion-exchanged (PIE) waveguide to form a composite optical waveguide (COWG) for trace-ammonia detection. The BTB film has a high refractive index (1.69) and a smooth surface and is transparent to a 633-nm laser beam in air. In,the COWG structure, the BTB film serves as a single-mode waveguide, and adiabatic transition of the TE0 mode was realized between the BTB waveguide and the PIE waveguide with both BTB tapers. In the presence of ammonia, the BTB film changes color from yellow to blue, which causes absorption of the 633-nm guided wave. Our experimental results demonstrate that such a guided wave absorption-based ammonia-gas sensor is much more sensitive than one based on evanescent-wave absorption. A detection limit of part in 10(9) of ammonia has been realized for a BTB film-PIE glass COWG. (C) 2001 Optical Society of America. [References: 6]
机译：据我们所知，这是我们第一次成功地将溴化百里酚蓝（BTB）的锥形膜蒸发到钾离子交换（PIE）波导上，从而形成用于痕量氨检测的复合光波导（COWG）。 BTB膜具有高折射率（1.69）和光滑表面，并且对空气中的633 nm激光束透明。在COWG结构中，BTB膜用作单模波导，并且在具有两个BTB锥度的BTB波导和PIE波导之间实现了TE0模的绝热过渡。在存在氨的情况下，BTB膜的颜色从黄色变为蓝色，从而导致633 nm导波的吸收。我们的实验结果表明，这种基于导波吸收的氨气传感器比基于e逝波吸收的氨气传感器灵敏得多。对于BTB膜-PIE玻璃COWG，已经实现了氨的检出限为10（9）。 （C）2001年美国眼镜学会。 [参考：6]

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