Fig. 4. Light-matter coupling-tailored molecular sensing.
(A) Illustration of three coupling-tailored PNM arrays, each with 8 by 8 size-scaled PNM units. (B) Analytical TCMT solution for the two-resonator system. The gray line denotes the α-dependent maximal absorbance of the unperturbed bright mode, while the colored line shows the perturbed signal with additional loss γint2 due to the molecules. The absorbance modulation (the difference between the two lines) is depicted in green, revealing areas of negative, nearly no, and positive modulation in the regions of UC, CC, and OC, respectively. At 13.3°, the absorbance remains completely constant. (C to E) Uncoated (gray) and 5-nm PMMA-coated (colored) absorbance spectra for the UC, CC, and OC sensors, respectively. (F to H) The corresponding sensing results with both simulations (curves) and experiments (dots) consistently showing that the PMMA analyte can introduce negative, no, and positive modulations depending on the coupling regime.