【摘 要】
：
The optical response of metal nanoparticles can be modified through near-field or far-field interaction,yet the lattice plasmon modes (LPMs) considered can only be excited from the latter.Here instead,we present a theoretical evaluation for LPM excitation
【机 构】
：
State Key Laboratory of High Performance Complex Manufacturing,College of Mechanical and Electrical
论文部分内容阅读
The optical response of metal nanoparticles can be modified through near-field or far-field interaction,yet the lattice plasmon modes (LPMs) considered can only be excited from the latter.Here instead,we present a theoretical evaluation for LPM excitation via the near-field coupling process.The sample is an arrayed structure with specific units composed of upper metal disks,a lower metal hole and a sandwiched dielectric post.The excitation process and underlying mechanism of the LPM and the influence of the structure parameters on the optical properties have been investigated in detail by using a finite-difference time-domain (FDTD) numerical method.Our investigation presented here should advance the understanding of near-field interaction of plasmon modes for LPM excitation,and LPMs could find some potential applications,such as in near-field optical microscopes,biosensors,optical filters and plasmonic lasers.
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