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Plasmonic Hybrid Cavity-Channel Structure for Tunable Narrow-Band Optical Absorption

Abstract : A hybrid plasmonic structure consisting of adjacent U-shaped cavities separated by a nanochannel is proposed for tunable and narrow-band selection of light. The hybrid cavity-channel structure achieves absorption resonance with a bandwidth, defined as the full-width at half-maximum, of 1.5 nm and tunable property in the near-infrared and infrared regions. The hybrid structure resonance originates in the coupling of horizontal surface plasmon mode of the U-cavity with channel mode, which sustains stationary-surface-plasmons in the channel with antinodes at the channel entrances enabling light concentration and nodes at the channel exits enabling light confinement. As a result of the coupling, a sharp and strong absorption resonance is readily adjustable by varying the geometrical parameters of the U-cavity while keeping the channel parameters unchanged.
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https://hal-utt.archives-ouvertes.fr/hal-02442653
Contributor : Daniel Gavrysiak <>
Submitted on : Thursday, January 16, 2020 - 3:56:03 PM
Last modification on : Friday, January 17, 2020 - 1:36:32 AM

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Ya-Lun Ho, Gilles Lerondel, Jean-Jacques Delaunay. Plasmonic Hybrid Cavity-Channel Structure for Tunable Narrow-Band Optical Absorption. IEEE Photonics Technology Letters, Institute of Electrical and Electronics Engineers, 2014, 26 (19), pp.1979-1982. ⟨10.1109/LPT.2014.2344011⟩. ⟨hal-02442653⟩

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