As internet of things (IOT) has become a popular topic in current consumer electronics, there is a demand for cost-effective
sensors to monitor bio-signals. Traditional optical sensors employ low-dimensional gratings and high-resolution
spectrometers to detect the refractive index changes of the solutions. In this work, we develop an alternative
approach to correlate the concentration of molecules to the band diagrams of the photonic crystals. A relatively low-resolution
spectrum analyzer can be employed, yet achieves higher sensitivity than traditional approaches.
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