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A bound state in the continuum (BIC) is a localized state of an openstructure with access to radiation channels, yet it remains highly confinedwith, in theory, infinite lifetime and quality factor. There have been manyrealizations of such exceptional states in dielectric systems without loss.However, realizing BICs in systems with losses such as plasmonics remains achallenge. In this Letter, we explore the possibility of realizing BICs in ahybrid plasmonic-photonic structure consisting of a plasmonic grating coupledto a dielectric optical waveguide. The plasmonic-photonic system supports twodistinct groups of BICs: symmetry protected BICs at the {\Gamma}-point andoff-{\Gamma} Friedrich-Wintgen BICs. The photonic waveguide modes are stronglycoupled to the gap plasmons in the grating leading to an avoided crossingbehavior with a high value of Rabi splitting of 150 meV. Moreover, we show thatthe strong coupling significantly alters the band diagram of the hybrid systemrevealing opportunities for supporting stopped light at an off-{\Gamma} wideangular span.

Formation of Bound States in the Continuum in Hybrid Plasmonic-Photonic Systems