Figure 3
From: Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing
(a) Reflectance and phase spectra of the metasurface and Au mirror of a gas MAFP. (b) The reflectance and phase change spectra of the gas MAFP cavity with varying the refractive index of gaseous analyte from 1.000 to 1.010 in steps of 5 × 10−4. (c) The extracted dip position (red circles) of the gas MAFP for each refractive index, and the estimated slope (blue solid line) of ~ 1388 nm/RIU. (d) The extracted FWHM (red dots) and the linear fit (blue solid line). The change of FWHM within the refractive index range is 9 pm. All the results are obtained from numerical simulation.
