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We investigate optical Tamm states supported by a dielectric grating placedon top of a distributed Bragg reflector. It is found that under certainconditions the Tamm state may become a bound state in the continuum. The boundstate, in its turn, induces the effect of critical coupling with reflectanceamplitude reaching an exact zero. We demonstrate that the critical couplingpoint is located in the core of a vortex of the reflection amplitude gradientin space of wavelength and angle of incidence. The emergence of the vortex isexplained by the coupled mode theory.

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