A boundary element method based near field acoustic holography in noisy environments

2020 ◽  
Vol 147 (5) ◽  
pp. 3360-3371
Author(s):  
Haijun Wu ◽  
Dou Li ◽  
Liang Yu ◽  
Weikang Jiang
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Near Field ◽  
Noisy Environments ◽  
Acoustic Holography ◽  
Element Method

Plasmonics simulations including nonlocal effects using a boundary element method approach

2017 ◽  
Vol 31 (24) ◽  
pp. 1740007 ◽  
Author(s):  
Andreas Trügler ◽  
Ulrich Hohenester ◽  
F. Javier García de Abajo
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Metallic Nanoparticles ◽  
Spatial Dispersion ◽  
Near Field ◽  
Computational Cost ◽  
Local Theory ◽  
Nonlocal Interaction ◽  
Dispersion Effects ◽  
Element Method

Spatial nonlocality in the photonic response of metallic nanoparticles is actually known to produce near-field quenching and significant plasmon frequency shifts relative to local descriptions. As the control over size and morphology of fabricated nanostructures is truly reaching the nanometer scale, understanding and accounting for nonlocal phenomena is becoming increasingly important. Recent advances clearly point out the need to go beyond the local theory. We here present a general formalism for incorporating spatial dispersion effects through the hydrodynamic model and generalizations for arbitrary surface morphologies. Our method relies on the boundary element method, which we supplement with a nonlocal interaction potential. We provide numerical examples in excellent agreement with the literature for individual and paired gold nanospheres, and critically examine the accuracy of our approach. The present method involves marginal extra computational cost relative to local descriptions and facilitates the simulation of spatial dispersion effects in the photonic response of complex nanoplasmonic structures.

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