Plasmon Hybridization and Field Confinement in Multilayer Metal-Dielectric Nanocupsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 25 сентября 2013 г.
Аннотация:Large area arrays of dispersed multilayer gold-dielectric nanocups were fabricated by colloidal lithography and studied by extinction spectroscopy. Hybridization of the elemental plasmons of the individual nanocups gave rise to new resonance peaks in the visible and near infrared regions of the extinction spectrum. Transmission electron microscopy was used to confirm the fabricated structure geometry and the optical properties of the arrays were studied by UV-vis-NIR spectroscopy and finite-difference time-domain (FDTD) simulations. The nature of the resonances was elucidated from E-field plots and charge plots showing clear hybridized modes. We observe a dominant hybridized dipolar mode combining a bonding and anti-bonding mode at the two caps. A high energy antibonding (antisymmetric) quadrupolar mode of an individual nanocup is revealed through hybridization with an elemental mode on the second nanocup. A low energy tunable cavity mode with a very small mode volume is observed in the near-IR range.