1：Experimental Design and Method Selection:

The design involves a 2-D photonic crystal with a Mach-Zehnder interferometer configuration. The plane wave expansion method (PWE) is used to determine the device operating wavelength range, and the finite difference time domain method (FDTD) is used to calculate the device characteristic parameters.

2：Sample Selection and Data Sources:

The sensor is implemented using GaAs with a periodic arrangement of rods in air.

3：List of Experimental Equipment and Materials:

The device consists of circular rods placed in a background of air with specific parameters such as rod radius, lattice constant, and background refractive index.

4：Experimental Procedures and Operational Workflow:

The simulation involves calculating the photonic bandgap using PWE and evaluating the device performance using FDTD.

5：Data Analysis Methods:

The sensitivity of the sensor is determined as the ratio of resonant wavelength shift to the difference in applied hydrostatic pressures.