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We present a numerical study on a 2D array of plasmonic structures covered bya subwavelength film. We explain the origin of surface lattice resonances(SLRs) using coupled dipole approximation and show that thediffraction-assisted plasmonic resonances and formation of bound states in thecontinuum (BICs) can be controlled by altering the optical environment. Ourstudy shows that when the refractive index contrast is small ( $\Delta$n <-0.1), the SLR cannot be excited, while a significant contrast ($\Delta$n >0.3) not only sustains plasmonic-induced resonances but also forms bothsymmetry-protected and accidental BICs. The results can aid the streamlineddesign of plasmonic lattices in studies on light-matter interaction andapplications in biosensors and optoelectronic devices.

Coexistence of Surface Lattice Resonances and Bound states In the Continuum in a Plasmonic Lattice