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Bound states in the continuum (BICs) garnered significant for their potentialto create new types of nanophotonic devices. Most prior demonstrations werebased on arrays of dielectric resonators, which cannot be miniaturized beyondthe diffraction limit, reducing the applicability of BICs for advancedfunctions. Here, we demonstrate BICs and quasi-BICs based on high-qualityfactor phonon-polariton resonances in isotopically pure h11BN and how thesestates can be supported by periodic arrays of nanoresonators with sizes muchsmaller than the wavelength. We theoretically illustrate how BICs emerge fromthe band structure of the arrays and verify both numerically and experimentallythe presence of these states and enhanced quality factor. Furthermore, weidentify and characterize simultaneously quasi-BICs and bright states. Ourmethod can be generalized to create a large number of optical states and totune their coupling with the environment, paving the way to miniaturizednanophotonic devices with more advanced functions.

Bound states in the continuum and long-range coupling of polaritons in hexagonal boron nitride nanoresonators