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Recent technological advancements have allowed to implement in solid-statecavity-based devices phenomena of quantum nature such as vacuum Rabi splitting,controllable single photon emission and quantum entanglement. For asufficiently strong coupling between a quantum emitter and a cavity, largequality factors ($Q$) along with small modal volume ($V_{eff}$) are essential.Here we show that by applying a 5nm Al coating to the sidewalls of asubmicrometer-sized Fabry-P\'{e}rot microcavity, the cavity $Q$ can betemperature-tuned from few hundreds at room temperatures to 2$\times$10$^5$below 30~K. This is achieved by, first, a complete shielding of the sidewallloss with ideally reflecting lateral metallic mirrors and, secondly, a dramaticdecrease of the cavity's axial loss for small-sized devices due to the largelyoff-axis wavevector within the multilayered structure. Our findings offer anovel temperature-tunable platform to study quantum electrodynamical phenomenaof emitter-cavity coupling. We demonstrate that a Rabi splitting of 2g=24~GHz(0.142~nm) can be readily achieved at 40~K in a 0.8$\mu$m-sized device, whichhas an $V_{eff}\approx0.0845~\mu$m$^3$, comparable to best 2D photonic crystal(PhC) nanocavities.

Temperature tunability of quantum emitter - cavity coupling in a photonic wire microcavity with shielded sidewall loss