Integrated Switching Circuit for Low-Noise Self-Referenced Mid-Infrared Absorption Sensing Using Silicon Waveguides
Integrated Switching Circuit for Low-Noise Self-Referenced Mid-Infrared Absorption Sensing Using Silicon Waveguides
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DOI：
10.1109/jphot.2021.3121331
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发表时间：
2021-12
影响因子：
2.4
通讯作者：
Y. Qi;Zhexuan Zheng;M. Banakar;Yangbo Wu;Anushka S. Gangnaik;D. Rowe;V. Mittal;J. Butement;J. Wilkinson;G. Mashanovich;M. Nedeljkovic
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文献类型：
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作者：
Y. Qi;Zhexuan Zheng;M. Banakar;Yangbo Wu;Anushka S. Gangnaik;D. Rowe;V. Mittal;J. Butement;J. Wilkinson;G. Mashanovich;M. Nedeljkovic
我们报告了一种新的方法，准确地测量中红外吸收的流体分析物使用片上波导，允许测量参考噪声和漂移减少，同时只使用一个单一的外部检测器。制造与微流体通道集成的绝缘体上硅波导电路，其中一对开关以几kHz的速率在倏逝波吸收传感器波导和参考波导之间交替光，从而允许从测量中去除低频公共噪声分量，并且与简单的波导吸收传感器相比，导致本底噪声降低11倍。通过使用该装置检测3.77 µm波长处的异丙醇（IPA）吸收峰，对该装置进行了验证。
We report a new method of accurately measuring the mid-infrared absorption of fluid analytes using on-chip waveguides that allows measurements to be referenced for noise and drift reduction whilst using only a single external detector. A silicon-on-insulator waveguide circuit integrated with a microfluidic channel is made in which a pair of switches alternate light between an evanescent absorption sensor waveguide and a reference waveguide at a rate of a few kHz, thus allowing low frequency common noise components to be removed from the measurement, and leading to a reduction in the noise floor by a factor of 11 compared to a simple waveguide absorption sensor. The device was verified by using it to detect an Isopropyl alcohol (IPA) absorption peak at a wavelength of 3.77 µm.