Tuning micropillar cavity birefringence by laser induced surface defects

摘要

We demonstrate a technique to tune the optical properties of micropillarcavities by creating small defects on the sample surface near the cavity regionwith an intense focused laser beam. Such defects modify strain in thestructure, changing the birefringence in a controllable way. We apply thetechnique to make the fundamental cavity mode polarization-degenerate and tofine tune the overall mode frequencies, as needed for applications in quantuminformation science.