Cooperativity enhancement in buckled-dome microcavities with omnidirectional claddings

We describe a theoretical study of dipole emitters inside buckled-dome Fabry-Perot cavities with Si/SiO₂-based omnidirectional Bragg mirrors. The low penetration depth of the mirrors contributes to low mode volumes, potentially enabling large enhancement of spontaneous emission into moderate-quality-factor cavity modes. Furthermore, the omnidirectional mirrors can significantly inhibit background emission. For a representative cavity operating in a fundamental spatial mode regime at λ ~1550 nm, and an optimally located emitter, we predict simultaneous enhancement of emission into the cavity mode by ~120 and suppression of background emission by ~25, implying the potential for a cooperativity C ~1500. This is combined with Q ~10³, significantly lower than is required to attain similar values of C without background inhibition, and thus implying better compatibility for broad line-width emitters.