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Abstract
${\rm Si}/{{\rm SiO}_2}$ nanopillar dimer arrays are proposed to form two narrow surface lattice resonances (SLRs). One (named ${{\rm SLR}_1}$) mainly comes from the coupling between single ${\rm Si}/{{\rm SiO}_2}$ nanopillar dimers’ electric dipole resonance and arrays’ diffraction waves. Another (named ${{\rm SLR}_2}$) mainly comes from the coupling between single ${\rm Si}/{{\rm SiO}_2}$ nanopillar dimers’ magnetic dipole resonance and arrays’ diffraction waves. In the array, Si nanopillar dimers are on ${{\rm SiO}_2}$ nanopillar dimers, and ${{\rm SiO}_2}$ nanopillar dimers are on a quartz substrate. The simulated results reveal that the two SLRs’ linewidths can be as small as 2.6 nm. However, for the ${\rm Si}/{{\rm SiO}_2}$ nanopillar array without dimers, only one SLR can be formed. Compared to the SLR of the ${\rm Si}/{{\rm SiO}_2}$ nanopillar array, the SLRs’ intensity of the ${\rm Si}/{{\rm SiO}_2}$ nanopillar dimer array is stronger and the SLRs’ linewidth of the ${\rm Si}/{{\rm SiO}_2}$ nanopillar dimer array is smaller. The ${\rm Si}/{{\rm SiO}_2}$ nanopillar dimers’ height and diameter, the gap of dimers, and the arrays’ period are all important to regulate the two SLRs. This work is important to the design of micro–nano photonic devices based on multiple SLRs.
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