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In this paper, we present a Bound states in the continuum (BIC) metamaterialin heterogeneous structures based on the universal coupled mode theory. We findthe more general physical parameters to represent BIC, which are the resonantfrequencies and corresponding phases of metamaterial structures. Therefore, BICmetamaterial comes from the equal value of the resonant frequencies and phasesof metamaterial structures which are not only for homogeneous structures.Meanwhile if slightly vary one of metamaterial structure's resonant frequencyand phase by varying geometry, we can obtain the quasi-BIC instead of brokensymmetry of homogeneous structures. In this paper, we provide the BIC andquasi-BIC with one example of two heterogeneous structures which are cut wire(CW) and Split-Ring Resonator (SRR), to widely extends the metamaterial BICbeyond common sense. Furthermore, we demonstrate the simulation results andexperimental results to proof our idea.

Coupling-assisted quasi-bound states in the continuum in heterogeneous metasurfaces