1. Coexistence of Surface Lattice Resonances and Bound states In the Continuum in a Plasmonic Lattice
- Author
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Trinh, Quoc Trung, Nguyen, Sy Khiem, Nguyen, Dinh Hai, Tran, Gia Khanh, Le, Viet Hoang, Nguyen, Hai Son, and Le-Van, Quynh
- Subjects
Physics - Optics - Abstract
We present a numerical study on a 2D array of plasmonic structures covered by a subwavelength film. We explain the origin of surface lattice resonances (SLRs) using coupled dipole approximation and show that the diffraction-assisted plasmonic resonances and formation of bound states in the continuum (BICs) can be controlled by altering the optical environment. Our study 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 both symmetry-protected and accidental BICs. The results can aid the streamlined design of plasmonic lattices in studies on light-matter interaction and applications in biosensors and optoelectronic devices.
- Published
- 2022
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