Engineering Bound States in the Continuum at Telecom Wavelengths with Non‐Bravais Lattices

Various optical phenomena can be induced in periodic arrays of nanoparticles by the radiative coupling local dipoles each particle. Probably most impressive example is bound states continuum (BICs), which are electromagnetic modes with a dispersion inside light cone but infinite lifetime, that is, cannot leak to continuum. Symmetry-protected BICs appear at highly symmetric points systems. Although addition nonequivalent lattice unit cell an easy and straightforward way tuning symmetry, such particle lattice, non-Bravais less explored among Starting from square Si nanodisks, three lattices prepared detuning size position second disk cell. Diffraction-induced excites magnetic/electric nanodisk, producing two surface resonances Γ point band gap between. The high/low energy branch becomes BIC for size/position-detuned array, respectively, while both branches bright (or leaky) when detuned simultaneously. unexplored role interplay between magnetic electric dielectric connection change character discussed aid coupled dipole model. This study gives simple telecom wavelengths lattices, including plasmonic systems, thus scalable wide range frequencies.