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Optical characteristics of rounded silver nanoprisms

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Abstract

We analyzed numerical optical characteristics of silver nanoprisms with rounded corners using the three-dimensional finite-difference time-domain method. The enhancement of the electric field was decreased from 240 to 13 times by introducing a large radius of curvature at the nanoprism corners such that it became a cylinder. This caused the optical multi-mode to change to single dipole mode. In the largest local electric field enhancement using the bowtie structure, which consisted of a pair of nanoprisms with rounded corners (the curvature radius and the gap distance were 8.66 and 1 nm, respectively), the electric field was enhanced by a factor of 360 at the hotspot. The bowtie structure that has non-zero curvature radii produces a larger electric field enhancement than does the single nanoprism without a curvature radius. Furthermore, the numerical simulation elucidates that the change of the curvature radius and the change of the gap distance have the same influence on the electric field enhancement.

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Acknowledgments

This work was supported by JSPS KAKENHI Grant Number 15H03546 and 15K13977.

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Authors and Affiliations

  1. Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20 Hayashicho, Takamatsu, Kagawa, 761-0396, Japan

    Tomohiro Mori, Kenzo Yamaguchi, Yasuhiro Tanaka & Yoshifumi Suzaki

  2. Industrial Technology Center of Wakayama Prefecture, 60 Ogura, Wakayama, 649-6261, Japan

    Tomohiro Mori

  3. Institute of Technology and Science, Tokushima University, 2-1 Minamijosanjima, Tokushima, 770-8506, Japan

    Masanobu Haraguchi

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  1. Tomohiro Mori
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  2. Kenzo Yamaguchi
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  3. Yasuhiro Tanaka
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  4. Yoshifumi Suzaki
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  5. Masanobu Haraguchi
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Correspondence to Tomohiro Mori.

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Mori, T., Yamaguchi, K., Tanaka, Y. et al. Optical characteristics of rounded silver nanoprisms. Opt Rev 23, 260–264 (2016). https://doi.org/10.1007/s10043-016-0188-8

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