Fig. 4: Coupled optomechanical cavity containing a bulk acoustic wave (BAW) resonator.
From: Gravitational wave detectors with broadband high frequency sensitivity
The following cavity parameters are used in the calculation of optomechanical coupling to BAW resonator antiphase surface motion. The BAW resonator position is denoted using x1 at the flat face and x2 at the apex of the curved face. The electric field amplitude in the vacuum spaces is denoted by E1 and E4. The electric field inside the crystal is composed of a superposition of E2 and E3.The cavity length is denoted as Lf.
