Abstract

Lithium niobate (LiNbO₃) is a versatile crystalline material for various photonic applications. With the recent advances in LiNbO₃-on-insulator (LNOI) thin film technology, LiNbO₃ has been regarded as one of the most promising platforms for multi-functional integrated photonics. In this work, we present the field enhancement due to collective resonances in arrayed LiNbO₃ nanoantennas. These resonances arise from the enhanced radiative coupling of localized Mie resonances in the individual nanoparticles and Rayleigh anomalies due to in-plane diffraction orders of the lattice. We describe the pronounced differences in field enhancement and field distributions for electric and magnetic dipoles, offering valuable information for the design and optimization of high-quality-factor optical metasurfaces based on LiNbO₃.

© 2021 Chinese Laser Press

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