1：Experimental Design and Method Selection:

The study used Fabry–Perot cavities with aluminum or silver mirrors and R6G-doped PMMA layers. Reflectance, excitation, and emission spectra were measured to analyze coupling regimes. Theoretical calculations employed transfer matrix-based methods to predict reflectance and dispersion curves.

2：Sample Selection and Data Sources:

Samples included cavities of varying sizes (117-204 nm for PMMA layer thickness) and control R6G:PMMA films on glass. Data were sourced from experimental measurements using spectrophotometers.

3：List of Experimental Equipment and Materials:

Equipment includes spin coaters (Model 6800 and Spincoat G3P-8 from Specialty Coating Systems), thermal evaporator (Edwards 306), profilometer (Bruker DekTak XT), spectrophotometer (Lambda 900 from PerkinElmer with integrating sphere), and spectrophotometer (Fluorolog 3 from HORIBA). Materials include rhodamine 6G perchlorate, PMMA, dichloromethane, aluminum, silver, and glass substrates.

4：Experimental Procedures and Operational Workflow:

Cavities were fabricated by depositing metal mirrors and spin-coating R6G:PMMA layers. Thicknesses were measured with a profilometer. Reflectance spectra were collected at near-normal incidence, and emission/excitation spectra were measured. Control samples on glass were used for comparison.

5：Data Analysis Methods:

Data analysis involved comparing experimental reflectance dips and spectral maxima with calculated dispersion curves. Differences in spectra were normalized and analyzed to distinguish quantum effects from trivial filtering.