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  • Geometry-Modulated Magnetoplasmonic Optical Activity of Au Nanorod-Based Nanostructures

    Author(s)
    Han, Bing
    Gao, Xiaoqing
    Shi, Lin
    Zheng, Yonglong
    Hou, Ke
    Lv, Jiawei
    Guo, Jun
    Zhang, Wei
    Tang, Zhiyong
    Griffith University Author(s)
    Tang, Zhiyong
    Year published
    2017
    Metadata
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    Abstract
    Comprehension and modulation of optical activity at nanoscale have attracted tremendous interest in the past decades due to its potential application in many fields including chemical/biological sensing, artificial metamaterials, asymmetric catalysis, and so forth. As for the conventional molecular materials, magnetic field is among the most effective routes in inducing and manipulating their optical activity; whereas the magnetic optical activity at nanoscale calls for deeper understanding, especially for anisotropic noble metal nanoparticles. In this work, distinctly different magnetic circular dichroism (MCD) responses ...
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    Comprehension and modulation of optical activity at nanoscale have attracted tremendous interest in the past decades due to its potential application in many fields including chemical/biological sensing, artificial metamaterials, asymmetric catalysis, and so forth. As for the conventional molecular materials, magnetic field is among the most effective routes in inducing and manipulating their optical activity; whereas the magnetic optical activity at nanoscale calls for deeper understanding, especially for anisotropic noble metal nanoparticles. In this work, distinctly different magnetic circular dichroism (MCD) responses are demonstrated in gold nanorods (GNRs) with a derivative-shaped MCD signal corresponding to the transverse surface plasmon resonance (TSPR) band and a Gaussian-shaped signal at the position of the longitudinal surface plasmon resonance (LSPR) band. Furthermore, changing the aspect ratio of GNRs easily regulates such magnetoplasmonic CD response. More interestingly, GNR assemblies with different geometric configuration (end-to-end and side-by-side) show structure-sensitive magnetoplasmonic CD response. Armed with theoretical calculation, we clearly elucidate the intrinsic relationship of the resultant magnetoplasmonic CD response with the optical symmetry and geometry factor inside one-dimensional GNRs. This work not only greatly benefits our understanding toward the nature of SPR mode in anisotropic plasmonic nanostructures but also opens the way to achieve tunable magnetoplasmonic response, which will significantly advance the design and application of optical nanodevices.
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    Journal Title
    Nano Letters
    Volume
    17
    Issue
    10
    DOI
    https://doi.org/10.1021/acs.nanolett.7b02583
    Subject
    Nanotechnology
    Science & Technology
    Physical Sciences
    Technology
    Chemistry, Multidisciplinary
    Chemistry, Physical
    Publication URI
    http://hdl.handle.net/10072/408311
    Collection
    • Journal articles

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