npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2019; 69: 25-30

Published online January 31, 2019 https://doi.org/10.3938/NPSM.69.25

Copyright © New Physics: Sae Mulli.

Dependences of the Near-Field Characteristics of the Nano-Gap Structure on the Difference between Pentagonal and Circular Nano-Wires: A Numerical Study

Vasanthan DEVARAJ1, Jong-Min LEE1, Chun Tae KIM2, Won-Geun KIM2, Jin-Woo OH*1,2,3

1 Research Center for Energy Convergence Technology, Pusan National University, Busan 46241, Korea
2 Department of Nano Fusion Technology, Pusan National University, Busan 46241, Korea
3 Department of Nanoenergy Engineering, Pusan National University, Busan 46241, Korea

Correspondence to:ojw@pusan.ac.kr

Received: December 5, 2018; Revised: December 10, 2018; Accepted: December 11, 2018

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

When a nanogap was formed by using a metal nanowire, the dependences of the electric field characteristics on the shape of the nanowire were calculated by using a 3-dimensional finite-difference time-domain method. The nanogaps formed by using pentagon-shaped nanowires had electric field enhancement characteristics similar to those of the nanogaps formed by using circular nanowires, but the stability of the resonance wavelength was superior. The excellent resonance wavelength stability means that the resonance wavelength does not vary greatly with the difference in the nanogap spacing. This method is advantageous for fabricating a device with stable resonance characteristic in-spite of geometrical errors and can be commercialized at low fabrication cost. Surface plasmon-mode information, which can be indirectly identified in the electric field's shape, is discussed to explain the cause of such stability.

Keywords: Surface plasmon, Metal nanowire, Plasmonic sensor

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