We systematically investigate the evolution of resonant modes in a rolled-up microcavity as the overlap length between structural notches increases, which presents a modulation behavior for high Q factors. The resonant modes in the rolled-up microcavity display a deterministic mode chirality, which is well correlated to the Q factor. We derive a two-mode non-Hermitian Hamiltonian to clarify these unusual findings. It reveals that strong resonant interactions of scattered waves between the structural notches are responsible for the high mode chirality (thus high Q factor) and its modulation behavior in rolled-up microcavities.
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