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Numerical Analysis of Nanogap Effects in Metallic Nano-disk and Nano-sphere Dimers: High Near-field Enhancement with Large Gap Sizes

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Abstract

Various gap sizes are investigated numerically to extract the local electric field enhancement from a gold sphere and disk dimer systems. Our simulations predict that a metallic disk dimer system(s) exhibit large local electric field enhancements at larger gap sizes (20 nm, 40 nm) as compared to that of sphere dimer designs (gap size = 8 nm, 14 nm). These gap size differences ~ 2.5 -3.3 times larger as compared to that of sphere dimer systems, facilitates the device fabrication. These numbers are obtained by the influence of uniform gap size distribution as a function of total volume “±Z direction”. Such geometry, by achieving good local electric field enhancement from larger gap size, will enhance the variety of potential applications in the field of plasmonics, sensors, single molecule detection, surface enhanced spectroscopy, and so on.

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Authors and Affiliations

  1. Research Center for Energy Convergence Technology, Pusan National University, Busan, 46241, Korea

    Vasanthan Devaraj & Jin-Woo Oh

  2. Department of Chemistry and Smith Liberal Arts College, Sahmyook University, Seoul, 01795, Korea

    Jongwan Choi

  3. Department of Cogno-Mechatronics Engineering, Pusan National University, Busan, 46241, Korea

    Chang-Seok Kim

  4. Department of Nano Fusion Technology and BK21 Plus Nanoconvergence Technology Division, Pusan National University, Busan, 46241, Korea

    Jin-Woo Oh & Yoon-Hwae Hwang

  5. Department of Nanoenergy Engineering, Pusan National University, Busan, 46241, Korea

    Jin-Woo Oh & Yoon-Hwae Hwang

Authors
  1. Vasanthan Devaraj
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  2. Jongwan Choi
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  3. Chang-Seok Kim
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  4. Jin-Woo Oh
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  5. Yoon-Hwae Hwang
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Correspondence to Jin-Woo Oh.

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Devaraj, V., Choi, J., Kim, CS. et al. Numerical Analysis of Nanogap Effects in Metallic Nano-disk and Nano-sphere Dimers: High Near-field Enhancement with Large Gap Sizes. J. Korean Phys. Soc. 72, 599–603 (2018). https://doi.org/10.3938/jkps.72.599

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  • DOI: https://doi.org/10.3938/jkps.72.599

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