Self-Assembled Plasmonic Core–Shell Clusters with an Isotropic Magnetic Dipole Response in the Visible Range

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• 作者：Stefan Mühlig ; Alastair Cunningham ; Sebastian Scheeler ; Claudia Pacholski ; Thomas Bürgi ; Carsten Rockstuhl ; Falk Lederer
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：August 23, 2011
• 年：2011
• 卷：5
• 期：8
• 页码：6586-6592
• 全文大小：894K
• 年卷期：0
• ISSN：1936-086X

文摘

We theoretically analyze, fabricate, and characterize a three-dimensional plasmonic nanostructure that exhibits a strong and isotropic magnetic response in the visible spectral domain. Using two different bottom-up approaches that rely on self-organization and colloidal nanochemistry, we fabricate clusters consisting of dielectric core spheres, which are smaller than the wavelength of the incident radiation and are decorated by a large number of metallic nanospheres. Hence, despite having a complicated inner geometry, such a core–shell particle is sufficiently small to be perceived as an individual object in the far field. The optical properties of such complex plasmonic core–shell particles are discussed for two different core diameters.