title: Influence of the interlayer on coupling of surface plasmons in a sandwiched structure with periodic array of nanoapertures.
abstract: In this work, we investigate the optical properties of a multilayer structure, where a SiO2 film is sandwiched by silver films with periodic array of sub-wavelength apertures. Due to the coupling of surface plasmons (SPs) between different layers, electric and magnetic resonances have been observed. By varying the thickness of the interlayer SiO2, we can modify relative phase of the SPs resonance and control the shifts of transmission peaks. Experimentally the multilayers are fabricated by magnetron sputtering and the array of apertures is milled by focused-ion-beam facility. The measured optical transmission spectra reasonably agree with our numerical calculation, which bases on three-dimensional finite-difference time-domain method. To understand the shifts of the peaks, we present a phenomenological explanation, considering the transmission peaks as energy levels, and the coupling of localized surface plasmons as perturbation. These results may have potential applications in designing plasmonic devices and tuning electromagnetic wave in nanophotonics.
authors: National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China.
authors: Liu-Yang
authors: LY
authors: Sun
authors: Ling
authors: L
authors: Qin
authors: Li-Hao
authors: LH
authors: Zhu
authors: Ren-Hao
authors: RH
authors: Fan
authors: De
authors: D
authors: Li
authors: Ru-Wen
authors: RW
authors: Peng