Surface plasmon resonance in electrodynamically coupled Au NPs monolayer/dielectric spacer/Al film nanostructure: tuning by variation of spacer thickness
| Autor: | Viktor V. Kozachenko, Anastasiya V. Tomchuk, Oleg A. Yeshchenko, Yuriy F Liakhov, Michael Haftel, Anatoliy O. Pinchuk |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Nanostructure Polymers and Plastics education technology industry and agriculture Metals and Alloys Analytical chemistry 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Coupling (electronics) Planar Extinction (optical mineralogy) 0103 physical sciences Monolayer Thin metal Surface plasmon resonance 0210 nano-technology |
| Zdroj: | Materials Research Express. 4:106401 |
| ISSN: | 2053-1591 |
| DOI: | 10.1088/2053-1591/aa8c3a |
| Popis: | Effects of plasmonic coupling between metal nanoparticles and thin metal films separated by thin dielectric film-spacers have been studied by means of light extinction in three-layer planar Au NPs monolayer/dielectric (shellac) film/Al film nanostructure. The influence of coupling on the spectral characteristics of the Au NPs SPR extinction peak has been analyzed with spacer thickness, varied from 3 to 200 nm. The main observed features are a strong red shift (160 nm), and non-monotonical behavior of the magnitude and width of Au NPs SPR, as the spacer thickness decreased. The appearance of an intensive gap mode peak was observed at a spacer thickness smaller than approximately 30 nm, caused by the hybridization of the Au NPs SPR mode and gap mode in the presence of the Al film. Additionally, the appreciable enhancement (5.6 times) of light extinction by the Au NPs monolayer in the presence of Al film has been observed. A certain value of dielectric spacer thickness (70 nm) exists at which such enhancement is maximal. |
| Databáze: | OpenAIRE |
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