Remarkable Radiation Efficiency through Leakage Modes in Two-Dimensional Silver Nanoparticle Arrays

    Authors

    W. F. Hu;S. L. Zou

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    ENHANCED RAMAN-SCATTERING; PLASMON RESONANCE; LINE-SHAPES; METAMATERIALS; MOLECULES; SPECTROSCOPY; WAVELENGTH; EXTINCTION; REFRACTION; LINESHAPES; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    Abstract

    Using the coupled dipole method, we investigated radiation efficiency through leakage modes in two-dimensional silver nanoparticle arrays. The leakage modes are defined as radiations along directions other than reflection and transmission directions, The leakage 1, efficiency depends on the particle size, lattice spacing, the number of particles in the array, and the angle of incidence. There is also a strong orientation dependence of leakage efficiency at different diffractive coupling orders among particles. We found that a total leakage efficiency of over 75% can be obtained due to the improved coherent coupling between metallic nanoparticles and optimized orientation of the induced dipoles relative to the reflection, transmission, as well as leakage directions. For a specified direction on the same side of the surface normal relative to the incident light, a leakage radiation efficiency as high as over 50% can be obtained. The simulations from the coupled dipole method were also compared to the results from the discrete dipole approximation method, which includes high order excitations of metal nanoparticles, and the differences between the coupled dipole and the discrete dipole approximation methods are explained.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    115

    Issue/Number

    35

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    17328

    Last Page

    17333

    WOS Identifier

    WOS:000294386000014

    ISSN

    1932-7447

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