Next Article in Journal
In Vitro Activity Assays of Sputtered HAp Coatings with SiC Addition in Various Simulated Biological Fluids
Previous Article in Journal
Pulsed Laser Deposited Films for Microbatteries
Communication

Modifying Plasmonic-Field Enhancement and Resonance Characteristics of Spherical Nanoparticles on Metallic Film: Effects of Faceting Spherical Nanoparticle Morphology

by 1,†, 2,†, 3,†, 1 and 1,2,3,*
1
Research Center for Energy Convergence and Technology Division, Pusan National University, Busan 46241, Korea
2
Department of Nanoenergy Engineering, Pusan National University, Busan 46241, Korea
3
Department of Nano Fusion Technology, Pusan National University, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Coatings 2019, 9(6), 387; https://doi.org/10.3390/coatings9060387
Received: 22 April 2019 / Revised: 12 June 2019 / Accepted: 13 June 2019 / Published: 15 June 2019
A three-dimensional finite-difference time-domain study of the plasmonic structure of nanoparticles on metallic film (NPOM) is presented in this work. An introduction to nanoparticle (NP) faceting in the NPOM structure produced a variety of complex transverse cavity modes, which were labeled S11 to S13. We observed that the dominant S11 mode resonance could be tuned to the desired wavelength within a broadband range of ~800 nm, with a maximum resonance up to ~1.42 µm, as a function of NP facet width. Despite being tuned at the broad spectral range, the S11 mode demonstrated minimal decrease in its near field enhancement characteristics, which can be advantageous for surface-enhanced spectroscopy applications and device fabrication perspectives. The identification of mode order was interpreted using cross-sectional electric field profiles and three-dimensional surface charge mapping. We realized larger local field enhancement in the order of ~109, even for smaller NP diameters of 50 nm, as function of the NP faceting effect. The number of radial modes were dependent upon the combination of NP diameter and faceting length. We hope that, by exploring the sub-wavelength complex optical properties of the plasmonic structures of NPOM, a variety of exciting applications will be revealed in the fields of sensors, non-linear optics, device engineering/processing, broadband tunable plasmonic devices, near-infrared plasmonics, and surface-enhanced spectroscopy. View Full-Text
Keywords: simulations; plasmonic modes; transverse cavity modes; near field enhancement; NPOM simulations; plasmonic modes; transverse cavity modes; near field enhancement; NPOM
Show Figures

Figure 1

MDPI and ACS Style

Devaraj, V.; Jeong, H.; Kim, C.; Lee, J.-M.; Oh, J.-W. Modifying Plasmonic-Field Enhancement and Resonance Characteristics of Spherical Nanoparticles on Metallic Film: Effects of Faceting Spherical Nanoparticle Morphology. Coatings 2019, 9, 387. https://doi.org/10.3390/coatings9060387

AMA Style

Devaraj V, Jeong H, Kim C, Lee J-M, Oh J-W. Modifying Plasmonic-Field Enhancement and Resonance Characteristics of Spherical Nanoparticles on Metallic Film: Effects of Faceting Spherical Nanoparticle Morphology. Coatings. 2019; 9(6):387. https://doi.org/10.3390/coatings9060387

Chicago/Turabian Style

Devaraj, Vasanthan, Hyuk Jeong, Chuntae Kim, Jong-Min Lee, and Jin-Woo Oh. 2019. "Modifying Plasmonic-Field Enhancement and Resonance Characteristics of Spherical Nanoparticles on Metallic Film: Effects of Faceting Spherical Nanoparticle Morphology" Coatings 9, no. 6: 387. https://doi.org/10.3390/coatings9060387

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop