Experimental demonstration of dispersion engineering through mode interactions in plasmonic microcavities
Experimental demonstration of dispersion engineering through mode interactions in plasmonic microcavities
复制标题
通过等离子体微腔中的模式相互作用进行色散工程的实验演示
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. Osten
中科院分区：
文献类型：
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作者：
L. Fu;P. Schau;K. Frenner;H. Schweizer;Jun Zhao;B. Frank;Larissa Wollet;P. Gaiser;B. Gompf;H. Giessen;W. Osten
Plasmonic microcavities are compact systems having the capability to confine light in an extremely small volume. Light matter interactions can therefore be mediated very effectively by them. In this report we demonstrate experimentally that dispersion of photonic cavity modes can be tuned to a large degree in a plasmonic microcavity with two identical corrugated metallic films as resonant mirrors. The modification of the dispersion is induced by interactions between the photonic and plasmonic modes. Additionally, the excited surface waves are strongly enhanced by the gratings, which is important for coupling and enhancing evanescent fields. To realize such a cavity, we employed self-assembled monolayer nanosphere crystals as a prepatterned substrate. Metal/dielectric/metal films were subsequently deposited on it. The cavity length was used to tune the interaction strength. As a result, the original positively dispersive FP mode, i.e., the resonance frequency is increased with the incident angle, becomes independent or even negatively dependent on the incident angle. Due to the hexagonal textured corrugation of the metal film and the existence of some line defects in a large area, the optical response is isotropic and independent of the specific polarization. This behavior can have potential applications for light emission devices, plasmonic color filters and subwavelength imaging.
