3차원 FDTD Simulation을 이용한 자기조립된 Ag 나노입자의 국소표면플라즈몬공명 상호작용 현상 연구 (Localized Surface Plasmon Resonance Coupling in Self-Assembled Ag Nanoparticles by Using 3-Dimensional FDTD Simulation)

서지정보

· 발행기관 : 한국재료학회
· 수록지 정보 : 한국재료학회지 / 24권 / 8호 / 417 ~ 422페이지
· 저자명 : 이경민, 윤순길, 정종율

초록

In this study, we investigated localized surface plasmon resonance and the related coupling phenomena with respectto various geometric parameters of Ag nanoparticles, including the size and inter-particle distance. The plasmon resonances ofAg nanoparticles were studied using three-dimensional finite difference time domain(FDTD) calculations. From the FDTDcalculations, we discovered the existence of a symmetric and an anti-symmetric plasmon coupling modes in the coupled Agnanoparticles. The dependence of the resonance wavelength with respect to the inter-particle distance was also investigated,revealing that the anti-symmetric mode is more closely correlated with the inter-particle distance of the Ag nanoparticles thanthe symmetric mode. We also found that higher order resonance modes are appeared in the extinction spectrum for closelyspaced Ag nanoparticles. Plasmon resonance calculations for the Ag particles coated with a SiO2 layer showed enhancedplasmon coupling due to the strengthened plasmon resonance, suggesting that the inter-particle distance of the Ag nanoparticlescan be estimated by measuring the transmission and absorption spectra with the plasmon resonance of symmetric and antisymmetriclocalized surface plasmons.

영어초록

In this study, we investigated localized surface plasmon resonance and the related coupling phenomena with respectto various geometric parameters of Ag nanoparticles, including the size and inter-particle distance. The plasmon resonances ofAg nanoparticles were studied using three-dimensional finite difference time domain(FDTD) calculations. From the FDTDcalculations, we discovered the existence of a symmetric and an anti-symmetric plasmon coupling modes in the coupled Agnanoparticles. The dependence of the resonance wavelength with respect to the inter-particle distance was also investigated,revealing that the anti-symmetric mode is more closely correlated with the inter-particle distance of the Ag nanoparticles thanthe symmetric mode. We also found that higher order resonance modes are appeared in the extinction spectrum for closelyspaced Ag nanoparticles. Plasmon resonance calculations for the Ag particles coated with a SiO2 layer showed enhancedplasmon coupling due to the strengthened plasmon resonance, suggesting that the inter-particle distance of the Ag nanoparticlescan be estimated by measuring the transmission and absorption spectra with the plasmon resonance of symmetric and antisymmetriclocalized surface plasmons.

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