Gradient effective medium model for inhomogenous nanoparticle layers
Paper in proceedings, 2017

Electromagnetic modeling of sensing of stochastic distributions of nanometer-sized particles usually requires a large number of calculations to correctly obtain the average response of a sensor. Here, we present an alternative method, which utilizes a gradient effective permittivity model based on the classical Maxwell-Garnett mixing formula. In our model the nanoparticle layer is homogenized into several effective sublayers, whose permittivities depend on the spatial distribution of nanoparticles (and consequently volume fraction) in the direction normal to the substrate. The presented approach enables more accurate prediction of the properties of inho-mogenous nanoparticle layers in a simpler way than by simulating actual particle distributions. The model is applied to simulate a plasmonic sensor covered by a Pd nanoparticle layer which undergoes sintering. The results of finite-difference-Time-domain and transfer-matrix simulations with effective gradient layers are consistent with rigorous simulations and are more precise than analogous simulations with a single Maxwell-Garnett effective layer.

Author

K. M. Czajkowski

University of Warsaw

D. Switlik

University of Warsaw

Tomasz Antosiewicz

Chalmers, Physics, Bionanophotonics

2017 11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017

64-66 8107840

11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017
Marseille, France,

Subject Categories

Physical Sciences

DOI

10.1109/MetaMaterials.2017.8107840