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HL: Fachverband Halbleiterphysik

HL 15: Focussed Session: Geometry- and Topology-Controlled Nanoarchitectures I

HL 15.10: Vortrag

Dienstag, 13. März 2018, 12:15–12:30, EW 015

Optical geometric phase in Möbius ring and asymmetric microtube cavities — •Libo Ma — Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany

Optical whispering gallery modes (WGMs) in micro-ring cavities are formed by self-interferences of optical waves with integer numbers of 2π phase differences along a ring trajectory. This kind of phase is usually called as dynamical phase since an extra phase, Berry phase (also known as geometrical phase), was discovered for general physical wave systems in nontrivial evolutions. Optical Berry phase was excluded from conventional WGM cavities because of trivial topology therein. Here, we talk about the generations of Berry phase in optical ring microcavities formed by twisted nano-strip (i.e. Möbius ring) and cone-shaped microtube structures. A Berry phase π is generated in Möbius ring, which leads to the formation of half-integer number of resonant modes and anomalous plasmon modes. More interestingly, the generations of Berry phase together with basis conversion was observed in the cone-shaped microtube cavities due to optical spin-orbit coupling in an anisotropic medium. Berry phase theory and quantum mechanical diagonalization procedure were applied to explain our observations. Our work paves a way for generating and manipulating optical Berry phase for both fundamental and applied studies in the platform of on-chip quantum devices.