Critical coupling vortex with grating-induced high quality optical Tamm states

Abstract

We investigate optical Tamm states supported by a dielectric grating placed on top of a distributed Bragg reflector. It is found that under certain conditions the Tamm state may become a bound state in the continuum. The bound state, in its turn, induces the effect of critical coupling with reflectance amplitude reaching an exact zero. We demonstrate that the critical coupling point is located in the core of a vortex of the reflection amplitude gradient in space of wavelength and angle of incidence. The emergence of the vortex is explained by the coupled mode theory.

References in corpus (5)

• Topological nature of bound states in the radiation continuum
• Controlling light absorption of graphene at critical coupling through magnetic dipole quasi-bound states in the continuum resonance
• Generalized magnetic mirrors
• Topological engineering of interfacial optical Tamm states for highly-sensitive near-singular-phase optical detection
• Chiral optical Tamm states at the boundary of the medium with helical symmetry of the dielectric tensor [In Russian]

Cited by in corpus (4)

• Tamm plasmon polariton in planar structures: A brief overview and applications
• Enhanced sensitivity of an all-dielectric refractive index sensor with optical bound state in the continuum
• Enhanced light absorption in Tamm metasurface with a bound state in the continuum
• Temporal coupled mode theory for high-$Q$ resonances in dielectric metasurfaces