Panuwat Chaiyachate ¹, Artit Chingsungnoen ², Thananchai Dasri ³

Affiliations
1 School of Science and Mathematics, Rajamangala University of Technology, Isan Sakon Nakhon Campus, Sakon Nakhon, 47160, TH
2 Department of Physics, Mahasarakham University, Maha Sarakham, 44150, TH
3 Department of Applied Science and Engineering, Khon Kaen University, Khon Kaen, 40002, TH

Abstract

Objectives: Surface plasmon exhibited in nano-sized particles such as gold, silver, copper has recently attracted a great deal of attention due to the enhancement and tunable optical properties in the visible to near-infrared region of the electromagnetic spectrum. In this work, the optical properties of dielectric material at noble metal core-shell nanoparticles were investigated. Methods: Mie theory is the analytical method is used to study via parameters of extinction, scattering and absorption efficiencies. The samples for studying were the composites of a dielectric material core coated by a thin noble metal (Ag, Au, and Cu). The core size was fixed at 50 nm, while the metal shell thicknesses were varied from 3 nm to 40 nm. Findings: The calculated optical properties were found that the surface plasmon resonance can be enhanced and tuned the wavelength from the near ultraviolettonear infrared regions by varying the shell thickness. Application: The dielectric core coated with a thin noble metal to promote the properties of the core can be applied in the field of plasmonic nanolaser, nonlinear plasmonic antenna, light trapping in thin-film organic solar cells, and biomedical research.

Keywords

Dielectric Material @ Noble Metal Core-Shell, Surface Plasmon

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Artit Chingsungnoen ¹, Thananchai Dasri ²

Affiliations
1 Technological Plasma Research Unit, Department of Physics, Faculty of Science, Mahasarakham University, 44150, TH
2 Faculty of Applied Science and Engineering, KHON KAEN University, NONG KHAI Campus, Nong Khai 43000, TH

Abstract

Objectives: In this work the PLASMONIC effects of Cu NANO particles with varying particle sizes and surrounding mediums, such as PEDOT: PSS layers of organic Bulk-HETEROJUNCTION (BHJ) solar cells and silica were investigated. Methods/Statistical Analysis: For this work the optical properties of Cu NANOPARTICLES with different sizes (by varying the particle diameter from 20 to 100 nm) and when surrounded by different mediums (dielectric constant in interval 1.49 to 7) were investigated in the wavelength range 300-900 nm. The Mie theory was used to analyze the light scattering and extinction efficiencies. Findings: The results show that the particle size and dielectric constant of the medium are the key factors that directly influence the PLASMONIC enhancements in the samples. At a wavelength more than 550 nm, there is a second peak of the resonance peaks, as the Cu NANO particle size increases and the efficiency peak slightly shifts to a longer wavelength. The wavelength of the resonance peak was found to haven on-linear dependence on the dielectric constant of the surrounding medium. In addition, the linear dependence of the maximum of the extinction efficiencies on the dielectric constant of the surrounding medium at a fixed particle radius was observed. Application/ Improvements: The Localized Surface PLASMON Resonance (LSPRs) exhibited by noble metal NANOPARTICLES, such as Au, Ag and Cu, leads to strong enhancements on the local electromagnetic fields surrounding the NANOPARTICLES.

Keywords

Cu NANOPARTICLE, Localized Surface PLASMON Resonance, Mie Theory, PLASMONIC Enhancements

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