ArticleNature nanotechnology2026
Optical multistability in a compact microcavity enabled by near-exceptional coupling.
Article in Nature nanotechnology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Multistability-the presence of multiple stable states under identical conditions-is a hallmark of nonlinear complexity, and in optics, a key enabler for multilevel optical memory. Yet, realizing optical multistability in a compact footprint useful for on-chip applications remains challenging, because optical nonlinearities are intrinsically weak and large free spectral range increases the multistability threshold. Here we achieve multistability by engineering a pair of spectrally close, ultrahigh-Q resonances in a photonic crystal microcavity. Leveraging structural perturbations that deliberately introduce non-Hermitian coupling through a shared radiation channel, we drive the resonances towards an exceptional point with nearly degenerate wavelengths and almost-equal quality factors approaching 10
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