An infrared refractive index sensor based on plasmonic perfect absorbers for glucose concentration sensing is experimentally demonstrated. Utilizing substantial absorption contrast between a perfect absorber ( at normal incidence) and a non-perfect absorber upon the refractive index change, a maximum value of figure of merit () about 55 and a bulk wavelength sensitivity about are achieved. The demonstrated sensing platform provides great potential in improving the performance of plasmonic refractive index sensors and developing future surface enhanced infrared spectroscopy.
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