Influence of the Substrate to the LSP Coupling Wavelength and Strength

Nanoscale Research Letters

Edward T. Yu¹  Li Ji¹  Na Gao²  Kai Huang²  Penggang Li²  Junyong Kang²  Jiawei Liao²  Jin Zhang³ 

[1] Department of Electrical and Computer Engineering, Microelectronic Research Center, The University of Texas at Austin;Fujian Provincial Key Laboratory of Semiconductors and Applications, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University;Inspection and Quarantine Technology Center, Xiamen Entry-Exit Inspection and Quarantine Bureau of the People’s Republic of China;

关键词: Localized surface plasmon;    Dielectric interface;    Resonance wavelength;    Coupling strength;   

DOI  :  10.1186/s11671-018-2691-2

来源: DOAJ

【 摘 要 】

Abstract Three kinds of typical structures, hemi-/spherical nanoparticles/nanoparticle dimers on the substrate and spherical nanoparticles/nanoparticle dimers half-buried into the substrate, are used for FDTD simulation to theoretically discuss the influence of the substrate to the localized surface plasmon (LSP) coupling when the metal nanoparticles/nanoparticle dimers are locating near a substrate. Simulated results show that the dependencies between the LSP coupling wavelength and the refractive index of the substrate for different structures are not the same, which can be attributed to the different polarization field distributions of LSPs. When light is incident from different directions, the LSP coupling strength are not the same as well and the ratios of the scattering peak intensities depend on the position of the metal nanoparticles or nanoparticle dimers. These phenomenon can be explained by the difference of the local driving electric field intensities which is modulated by the interface between the air and the substrate.

【 授权许可】

Unknown