Berry´s phase magnification in microcoil resonators

Research towards understanding the topological Berry´s phase (Φ_B) has been driven by its manifestation in various interesting quantum mechanical and optical phenomena. In helical fibre structures, the generation of Φ_B is well documented, and recently the amplification of Berry´s phase using a ring resonator was observed. In this work, we show it is theoretically possible to generate a large Berry´s phase using compact optical microcoil resonators (OMRs) formed by tightly winding a microfibre around a rod such that light can evanescently couple between neighbouring turns. In particular, the effect of Φ_B on the OMR transmission is analysed, in order to understand the associated polarisation effects which are potentially important for developing OMR applications.