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From weak to strong coupling of localized surface plasmons to guided modes in a luminescent slab
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论文类型：期刊论文
发表刊物：Phys. Rev. B
所属单位：光电学院，国家光电研究中心
刊物所在地：美国
学科门类：工学
项目来源：自然科学基金
文献类型：J
卷号：90
期号：23
页面范围：235406
关键字：无
DOI码：10.1103/PhysRevB.90.235406
发表时间：2014-12-15
摘要：We investigate a periodic array of aluminum nanoantennas embedded in a light-emitting slab waveguide. By varying the waveguide thickness, we demonstrate the transition from weak to strong coupling between localized surface plasmons in the nanoantennas and refractive index guided modes in the waveguide. We experimentally observe a nontrivial relationship between extinction and emission dispersion diagrams across the weak- to strong-coupling transition. These results have implications for a broad class of photonic structures where sources are embedded within coupled resonators. For nanoantenna arrays, strong versus weak coupling leads to drastic modifications of radiation patterns without modifying the nanoantennas themselves, thereby representing an unprecedented design strategy for nanoscale light sources.
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