Event Details
The response of metal nanoparticles in comparison with that of apertures with FDTD simulation and the application of single channel limit
Presenter: Wen Ma
Supervisor:
Date: Mon, May 14, 2018
Time: 16:00:00 - 16:30:00
Place: EOW 430
ABSTRACT
ABSTRACT:
Finite-Difference Time-Domain (FDTD) method is playing an important role in solving the Maxwell equation because the FDTD algorithm is a relatively fast method. While the simplicity is definitely another reason why the FDTD was used widely, the FDTD is also able to solve extremely complicated engineering problems.
For the situation of typical electric dipole transition, the maximum scattering cross section of the subwavelength nanoparticle can be proved to be 3λ^2/2π. This limit from standard scattering theory was named the single channel limit.
In this report, we will apply FDTD method to implement several simulations and investigate the relationship between the response and the single channel limit. First, with FDTD method, we will prove that apertures and nanoparticles behave in a very similar fashion and compare their maximum E fields. Second, we will investigate when the aperture gets the maximum absorption. Third, we will simulate the transition from a straight dipole nanoparticle to a split-ring resonator with FDTD method. Previous work was based on the discontinuous Galerkin time-domain (DGTD) method. Fourth, we will demonstrate that in a single aperture system, the forward scattering is equal to the backward scattering. Lastly, we will determine the transmission for a single aperture system with a thickness of 100nm. In each of the above cases, the extinction, scattering and absorption will be compared with the single channel limit.