Extremely intrinsic chirality in two-dimensional planar waveguide grating induced by quasi-bound states in the continuum
arxiv(2024)
摘要
The strong chiral light-matter interaction is crucial for various important
fields such as chiral optics, quantum optics, and biomedical optics, driving a
quest for the extreme intrinsic chirality assisted by ultrahigh quality (Q-)
factor resonances. In this quest, we propose a straightforward method to
achieve extreme intrinsic chirality in lossless planar structures by
manipulating the quasi-BIC through in-plane perturbation. The temporal
coupled-mode theory is employed to derive the conditions necessary for
achieving maximal intrinsic chirality. The quasi-BIC should be excited within
the transparent spectral range of the structure and couple with x- and
y-polarized waves with the same intensity but a phase difference of π/2.
For an illustration, a planar chiral dielectric dimeric waveguide grating is
designed that strong interacts with left circularly polarized (LCP) light while
decouples from right circularly polarized (RCP) light through in-plane symmetry
engineering. Furthermore, by adjusting the magnitude of the in-plane asymmetry,
we can independently manipulate the Q-factors of the chiral quasi-BIC while
maintaining nearly unity circular dichroism. Our results provide a simple yet
powerful paradigm for achieving extreme intrinsic chirality on an easily
manufacturable platform, which may have potential applications in chiral
emission, chiral sensing, and enantiomer separation.
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