Manipulation of polarization topology using a Fabry-Perot fiber cavity with a higher-order mode optical nanofiber

Optical nanofiber cavity research has mainly focused on the fundamental mode. Here, a Fabry-Perot fiber cavity with an optical nanofiber supporting the higher-order modes (TE01, TM01, HEo21, and HEe21) is demonstrated. Using cavity spectroscopy, with mode imaging and analysis, we observed cavity resonances that exhibited com-plex, inhomogeneous states of polarization with topological features containing Stokes singularities such as C-points, Poincare vortices, and L-lines. In situ tuning of the intracavity birefringence enabled the desired profile and polarization of the cavity mode to be obtained. We believe these findings open new research possibilities for cold atom manipulation and multimode cavity quantum electrodynamics using the evanescent fields of higher-order mode optical nanofibers.& COPY; 2023 Chinese Laser Press

Automated summary

Researchers have successfully demonstrated a Fabry-Perot fiber cavity with an optical nanofiber supporting higher-order modes (TE01, TM01, HEo21, and HEe21). Through cavity spectroscopy, mode imaging, and analysis, complex and inhomogeneous polarization states with topological features containing Stokes singularities were observed in the cavity resonances. The desired profile and polarization of the cavity mode were obtained by tuning the intracavity birefringence. These findings are believed to open new research possibilities for cold atom manipulation and multimode cavity quantum electrodynamics using higher-order mode optical nanofibers.