Significant miniaturization of high-Q supercavity systems with planar technology requires novel coupling structures that excite the desired set of resonant modes. We review the physics of bound states in the continuum (BICs) of open, high-index dielectric resonators, excited by new complex sources that enable a controlled interference in the system. We show that, in avoided-crossing regimes associated with quasi-BICs, the controlled retardation of inducing currents can bring up the Q-factors beyond the state-of-the-art levels in optimized, fully-symmetric systems. We illustrate our theory with proof-of-concept experiments in microwaves, comparing high-index dielectric resonators excited by microstrip structures with different mode complexity.
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