Plasmonic metasurfaces with tunable gap and collective SPR modes (Conference Presentation)

Anatoliy O. Pinchuk

doi:10.1117/12.2528903

9 September 2019 Plasmonic metasurfaces with tunable gap and collective SPR modes (Conference Presentation)

Anatoliy O. Pinchuk

Proceedings Volume 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII; 1108209 (2019) https://doi.org/10.1117/12.2528903
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Optical properties of a plasmonic metasurface made of a monolayer of gold nanoparticles in close proximity to an aluminum thin film were studied numerically and experimentally. Extinction spectra of the plasmonic metasurface were studied as functions of the thickness of a dielectric spacer between the monolayer of gold nanoparticles and the aluminum film in the visible wavelength range. The goal was to study the excitation of a collective surface plasmon resonance (SPR) mode and a gap plasmon mode as well as their dependence on the spacer thickness, nanoparticles spacing and their size. By using finite-difference-time-domain (FDTD) calculations we find that the SPR extinction peak first red-shifts and then splits into two peaks. The first extinction peak is associated with the collective SPR mode of the monolayer and it shifts to shorter wavelengths as the spacer layer decreases. As the spacer layer decreases from 35 nm to 7.5 nm, the second peak gradually appears in the extinction spectra of the metasurface. We assign the second peak to the gap mode. The gap mode first appears at around 620 nm or greater and it shifts to larger wavelength for larger nanoparticle spacing and size. The FDTD simulations are confirmed by an examination of the dispersion curves of a similar multilayer system. The computational results match the experimental results and confirm the excitation of the two modes.

Conference Presentation

Citation Download Citation

Anatoliy O. Pinchuk "Plasmonic metasurfaces with tunable gap and collective SPR modes (Conference Presentation)", Proc. SPIE 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII, 1108209 (9 September 2019); https://doi.org/10.1117/12.2528903

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KEYWORDS

Plasmonics

Nanoparticles

Aluminum

Finite-difference time-domain method

Gold

Dielectrics

Optical properties

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