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https://doi.org/10.3938/NPSM.69.957
Finite-Difference Time-Domain Analysis on Grating Coupled Plasmonic System
New Phys.: Sae Mulli 2019; 69: 957~963
Published online September 30, 2019;  https://doi.org/10.3938/NPSM.69.957
© 2019 New Physics: Sae Mulli.

ByeongChan PARK, Jae-Won JANG*

Department of Physics, Pukyong National University, Busan 48513, Korea
Correspondence to: jjang@pknu.ac.kr
Received July 22, 2019; Revised August 21, 2019; Accepted August 23, 2019.
cc 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
In this work, we used a finite-difference time-domain (FDTD) characterization to demonstrate that the e-field near metal nanoparticles (NPs) can be enhanced by dielectric grating structure. An array of Au NPs ($\phi$ = 60~nm) with 4~nm gaps is set as a plasmonic system. The Au NP arrays on a flat polydimethylsiloxane (PDMS) substrate and a thin Au film-coated substrate are considered as control samples. Coupling with a PDMS line grating (5~$\mu$m $\times$ 3~$\mu$m $\times$ 1~$\mu$m = width $\times$ gap $\times$ height) is carried out by placing the Au NP array on the PDMS grating and by putting the PDMS grating on the Au NP array on a thin Au-film-coated substrate. The dependences of the Wavelength and the angle of incidence of a plane-wave source on the e-field intensity are investigated. For the sample systems in the result, the maximum e-field of the PDMS-grating-coupled samples is enhanced by more than a factor of two compared to that in the control samples. This finding will be helpful to develop e-field-enhancing templates for surface-enhanced raman spectroscopy (SERS) applications.
PACS numbers: 41.20.Jb, 68.65.$-$k, 78.67.$-$n, 81.07.$-$b
Keywords: Finite-difference time-domain simulation, Localized surface plasmon resonance, Grating


September 2019, 69 (9)
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