Thermal effects on the Brillouin frequency shift in strained optical silica nanofibers

Silica optical nanofibers (ONFs) are waveguides drafted from standard SMF-28 fibers, tapered into near-micrometer diameter rods extending over several centimeters. The strong optical confinement and low propagation losses in ONFs significantly enhance nonlinear effects. In the context of Brillouin scattering, the high temperature sensitivity of these nanoguides can be exploited for sensor applications. In this work, we investigate temperature-induced frequency shifts in the Brillouin spectra of nanofibers, with a particular focus on impact of waveguide geometry and packaging.