Strong coupling between plasmonic and excitonic systems creates new hybrid states comprising upper (E⁺) and lower (E^–) plexcitonic bands. On-demand switching of these bands holds potential for applications in next-generation optoelectronic devices. Plexcitonic nanostructures are obtained herein by electrostatically binding J-aggregates of 1,1′-diethyl-2,2′-cyanine iodide onto gold nanorods that are coated with silver shell. To avoid ensemble averaging effects, single-particle spectroscopy is employed allowing the collection of scattering spectra from individual nanostructures as a function of refractive index of the medium and the polarization angles of the light. Both experimental and finite-difference time-domain simulation studies revealed a gradual increase in the intensity of the E^– band and a decrease in that of the E⁺ band, as the refractive index of the medium increased from 1.0 to 1.5. In contrast, on varying the polarization angle, a gradual disappearance and formation of both the plexcitonic bands are observed.

中文翻译：

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Plexcitonic 系统中的偏振分辨光谱特征和介电介质效应：单粒子光谱学的发现


等离激元和激子系统之间的强耦合产生了新的混合态，包括上 （E⁺） 和下 （E^–） 丛带。这些频段的按需切换具有在下一代光电器件中的应用潜力。本文通过将 1,1′-二乙基-2,2′-菁碘化物的 J 聚集体静电结合到涂有银壳的金纳米棒上来获得丛电子纳米结构。为避免集成平均效应，采用单粒子光谱法，允许从单个纳米结构收集散射光谱，作为介质折射率和光偏振角的函数。实验和有限差分时域模拟研究都表明，随着介质的折射率从 1.0 增加到 1.5，E - 波段的强度逐渐增加，而 E⁺ 波段的强度逐渐降低。相反，在改变偏振角时，观察到两个丛子带逐渐消失和形成。