1 May 2012 Experimental demonstration of dispersion engineering through mode interactions in plasmonic microcavities
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Abstract
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.
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Liwei Fu, Liwei Fu, Philipp Schau, Philipp Schau, Karsten Frenner, Karsten Frenner, Heinz Schweizer, Heinz Schweizer, Jun Zhao, Jun Zhao, Bettina Frank, Bettina Frank, Larissa Wollet, Larissa Wollet, Patrick Gaiser, Patrick Gaiser, Bruno Gompf, Bruno Gompf, Harald Giessen, Harald Giessen, Wolfgang Osten, Wolfgang Osten, } "Experimental demonstration of dispersion engineering through mode interactions in plasmonic microcavities", Proc. SPIE 8423, Metamaterials VII, 84232I (1 May 2012); doi: 10.1117/12.923472; https://doi.org/10.1117/12.923472
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