Investigation of near field enhancement in clusters of plasmonic non-spherical particles considering nonlocal effects
Final Report Abstract
Within this project collaboration between the Bremen and the Moscow research groups the Discrete Sources Method (DSM) was extended. The basic DSM numerical scheme has been generalized to incorporate the Non-local Optical Effect in the form of the HDD and the GNOR models. Based on this extension a straightforward implementation to plasmonic particles of any geometry including non-spherical dimers with vanishing gaps has been performed. The unique opportunity of the DSM scheme that enables to check the accuracy of the computational results allowed to investigate gap sizes that belong to the quantum regime, that is 0.5nm≤ d ≤2nm. It has been demonstrated that accounting of NLE leads to plasmonic resonance blue shift and a damping of its amplitudes. Besides, it has been shown that both far and near field intensities do not tend to infinity when the gap vanishing. The role of the Additional Boundary Condition in the NLE models was clarified. It was found that the ABC is responsible for the blue shift of PR while the longitudinal fields cause PR amplitude damping. The extended DSM scheme was applied to investigate plasmon resonance of nonspherical semiconductor particles. In the frame of the HDD model for the NLE metalnitride semiconductors TiN, ZrN non-spherical particles have been treated. We employed a Drude-Lorentz model to simulate the frequency depended dielectric permittivity which seems to be appropriate in the range of wavelengths of 200-1300nm. The results obtained demonstrated that even under HDD accounting ZrN can realize higher intensity then a plasmonic gold particle. So, ZrN can be considered as the most appropriate plasmonic material which can replace the commonly used noble metals such as Au and Ag.
Publications
- Analysis of the scattering properties of 3D non-spherical plasmonic nanoparticles accounting for non-local effects. Journal of Modern Optics, 2018. 65(15): p. 1778-1786
Eremin, Y.A., T. Wriedt, and W. Hergert
(See online at https://doi.org/10.1080/09500340.2018.1459911) - Discrete sources method for modelling the nonlocal optical response of a nonspherical particle dimer. Journal of Quantitative Spectroscopy & Radiative Transfer, 2018. 217: p. 35-44
Eremin, Y., A. Doicu, and T. Wriedt
(See online at https://doi.org/10.1016/j.jqsrt.2018.05.026) - Fictitious Particle Approach for Light Scattering Investigation from the Line Features of a Substrate Based on the Discrete Sources Method. in The Generalized Multipole Technique for Light Scattering. Recent Developments. Ed. T. Wriedt, Yu. Eremin. Springer 2018. P.71-92
Yuri A. Eremin, Thomas Wriedt
(See online at https://doi.org/10.1007/978-3-319-74890-0_4) - The numerical scheme of the discrete sources method to analyze 3D plasmonic nanostructures accounting for the non-local effect. Journal of Computational Physics 388(2019)357–370
Yuri Eremin, Adrian Doicu, Thomas Wriedt
(See online at https://doi.org/10.1016/j.jcp.2019.03.018)
