Externally deposited phase-compensating dielectric mirrors for asymmetric Fabry–Perot cavity tuning

The wavelength dispersion of the phase shift on reflection that is inherent in dielectric Bragg mirrors can be used to phase compensate resonant-cavity-based devices such as multiple quantum well asymmetric Fabry–Perot spatial light modulators and vertical cavity surface-emitting lasers. We demonstrate the post-growth ability to accurately fine-tune the location of the Fabry–Perot minima in a resonant cavity by employing either a normal or inverted dielectric mirror configuration. The dielectric multilayer mirrors are composed of alternating quarter-wave layers of MgF2 and Sb2S3, and exhibit broadband reflectivities.