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MM: Fachverband Metall- und Materialphysik
MM 65: Nanomaterials - II
MM 65.5: Vortrag
Donnerstag, 19. März 2020, 18:30–18:45, IFW D
A plasmonic absorber based on the multi-order square array of gold nanocylinders — •Zhi-Hang Wang1, Yudie Huang1, Peng Xie2, Jiaxu Chen1, Fanzhou Lv1, Shiyao Jia1, Yi Wang1, Wei Wang2, and Wenxin Wang1 — 1Photonic Materials Group, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, China — 2College of Physical Science and Technology, Sichuan University, Chengdu, China
Plasmonic structures are known to have strong confinement for incident light at the nanoscale. Here, a plasmonic absorber based on a sandwich nanostructure consisting of multi-order square array of 'gold cylinders- dielectric space-gold resisting layer' is studied. Thanks to the numerical simulation by FDTD, longitudinal modes at the lateral surface of gold nanocylinders and the hybrid plasmon modes at the interfaces between gold and the dielectric space are demonstrated. Furthermore, simultaneously existing of the longitudinal modes and the hybrid plasmon modes arise the plasmon-plasmon coupling at 0.9 μm and 1.4 μm. These distinctive plasmon-plasmon coupling modes result in the anti-cross splitting phenomena in the dispersion diagrams. Finally, the simulated numerical performance is designed to be verified by the experimental measurements. This work demonstrates the sandwich structure based on multi-order square array of nanocylinders-dielectric space-gold resisting layer has good potential in the field of manipulating light at nanoscale with a low-cost, large-area sample fabrication process, which opens up many promising applications such as optical absorption and strong plasmon-plasmon interaction.