Tunable propagation of waveguide mode by incident spin states in multi-channel metal waveguide

Abstract

The control of scattering light direction by incident spin state offers a desirable and novel development opportunity for the nano optics and integrated optical devices. Here, the controllable propagation of light in multi-channel metal waveguide are investigated by analyzing and applying the symmetry between the light source and the system based on the component wave interference (CWI) theory. The composite electric and magnetic dipoles are used to drive the selective scattering in a four-channel structure. We found that it is a very convenient and intuitive method to obtain the selective propagation direction by considering the symmetry. We also reveal that the spin-momentum locking is only the eigen property of the optical system, instead of the origin of unidirectionality.

Tunable atomic spontaneous radiation in cylindrical waveguide

“…With the * Author to whom any correspondence should be addressed. use of CWI theory, the controllable propagation of waveguide modes in multi-channel waveguides can be achieved [9][10][11][23][24][25].…”

“…However, previous reports on PSHE have been relatively simple, primarily focusing on the directional propagation of a single-mode in two-dimensional configurations [8][9][10][11][12][23][24][25]. While these studies have provided valuable insights, the chiral interactions between atoms and waveguide modes remain an underexplored domain.…”