How to calculate the Positive/Negative surface charge distribution by Comsol Wave-optics?

10 April 2022 1 10K Report

In the field of Plasmonics, the surface charge of gold nanoparticle with proper size, would be excited by electromagnetic wave, and cause oscillation.

By utilizing the Physics "ewfd", the "ewfd.normE" and "ewfd.normD" can be directly obtained. However, "ewfd.normE" and "ewfd.normD" are absolute values which means no direction, and can not obtain the Positive/Negative surface charge. Is there any method to use the xyz component to solve it?

Hope to get your answers!

Haoxian Pan

The problem has been solved.

Utilizing the x, y and z components of the Polarization and surface normal vector, the surface charge density can be calculated. (See "López-Ortega et al. Light: Science & Applications (2020) 9:49")

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