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Circular dichroism in the interband transitions of achiral metal nanoparticles: TiN and noble metals

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Abstract

A longitudinal field component parallel to the wave vector is generally considered in nonlocal optical response. Longitudinal volume plasmons accompanied by inhomogeneous internal field optically break symmetry for isotropic metal nanoparticles. Here, natural circular dichroism in the interband transitions of TiN nanocubes, Au nanospheres, and Cu nanospheres in solution is presented. A field gradient or volume plasmons exert an electric force and consequently Lorentz force on bound valence-band electrons inside the nanoparticles. It is generalized that interband transitions in nanoparticles intrinsically produce a positive rotational strength and optical right-handedness. Electromechanical chir-alty is introduced to explain the optical activity of achiral nanoparticles.

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Author notes

  1. Jong-Won Park

    Present address: Department of Mechanical Engineering, Texas Tech University, Box 41021, Lubbock, Texas, 79409, USA

Authors and Affiliations

  1. Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts, 02215, USA

    Jong-Won Park

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  1. Jong-Won Park
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Correspondence to Jong-Won Park.

Electronic supplementary material

43579_2018_8020459_MOESM1_ESM.pdf

Supplementary Material: Circular dichroism in the interband transitions of achiral metal nanoparticles: TiN and noble metals

Supplementary material

Supplementary material

The supplementary material for this article can be found at https://doi.org/10.1557/mrc.2018.40

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Park, JW. Circular dichroism in the interband transitions of achiral metal nanoparticles: TiN and noble metals. MRS Communications 8, 459–465 (2018). https://doi.org/10.1557/mrc.2018.40

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  • DOI: https://doi.org/10.1557/mrc.2018.40

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