Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China.
Sci Rep. 2017 Jan 11;7:40071. doi: 10.1038/srep40071.
Plasmonic nanocavity arrays were achieved by producing isolated silver semi-cylindrical nanoshells periodically on a continuous planar gold film. Hybridization between localized surface plasmon resonance (LSPR) in the Ag semi-cylindrical nanoshells (SCNS) and surface plasmon polaritons (SPP) in the gold film was observed as split bonding and anti-bonding resonance modes located at different spectral positions. This led to strong local field enhancement and confinement in the plano-concave nanocavites. Narrow-band optical extinction with an amplitude as high as 1.5 OD, corresponding to 97% reduction in the transmission, was achieved in the visible spectrum. The resonance spectra of this hybrid device can be extended from the visible to the near infrared by adjusting the structural parameters.
通过在连续的平面金膜上周期性地生成孤立的银半圆柱形纳米壳，实现了等离子体纳米腔阵列。在银半圆柱形纳米壳（SCNS）中的局域表面等离激元共振（LSPR）和金膜中的表面等离激元极化激元（SPP）之间观察到杂化，表现为位于不同光谱位置的分裂键合和反键合共振模式。这导致在平面凹纳米腔中产生强的局域场增强和限制。在可见光范围内实现了高达 1.5 OD 的窄带光消光，对应于透射率降低 97%。通过调整结构参数，可以将这种混合器件的共振光谱从可见光扩展到近红外。
