1：Experimental Design and Method Selection:

The study involved designing a Bragg reflector with SiO2 and TiO2 layers using the quarter-wave approach for operation at 650 nm, fabricating it via RF sputtering, and developing a process for an elastic PDMS microcavity sandwiched between two Bragg reflectors. Optical transmittance was simulated using the Transfer Matrix Method (TMM) and measured with a spectrophotometer. Mechanical testing under compression forces was conducted to evaluate sensing capabilities.

2：Sample Selection and Data Sources:

Silica substrates were used for deposition. Samples included single Bragg reflectors and sandwich structures with PDMS cavities. Data came from optical measurements and simulations.

3：List of Experimental Equipment and Materials:

Equipment included an RF sputtering system with silica and titania targets, quartz microbalances (Veeco Instruments QM311), Varian Cary mod.5000 spectrophotometer, and a custom compression setup with tunable springs and parallel plates. Materials included SiO2, TiO2, Sylgard 184 Silicone Elastomer (PDMS), and curing agent.

4：Experimental Procedures and Operational Workflow:

For Bragg reflector fabrication, substrates were cleaned, heated to 120°C, and layers deposited via RF sputtering with monitored rates. For the microcavity, PDMS was mixed, applied, pressed with weight, cured at 80°C, and cleaned. Optical characterization involved transmittance measurements from 400-900 nm. Mechanical testing applied forces (20N, 80N, 100N) using the compression setup while measuring transmittance.

5：Data Analysis Methods:

TMM simulations with wavelength-dependent refractive indices were used for optical response prediction. Cavity thickness was estimated from transmission spectra using a derived equation. COMSOL Multiphysics software simulated mechanical deformations. Data comparison between measurements and simulations was performed to assess correlation.