A widespread approach in the FDTD analysis of dispersive media is the Recursive Convolution (RC) method. In the Drude version it shows a not so good accuracy in describing the electromagnetic field at the plasmonic resonance frequencies. We propose here a modified RC algorithm which, by minimizing the time truncation error, guarantees a better accuracy of the solution at parity of memory requirements and number of time iterations. We test the modified RC algorithm proposed by analyzing the behavior of gold and silver noble metal nanospheres exposed to an optical plane wave with respect to the standard RC approach and the analytical solution.
A modified RC-FDTD algorithm for plasmonics in Drude dispersive media
Calà Lesina, Antonino;Vaccari, Alessandro;
2012-01-01
Abstract
A widespread approach in the FDTD analysis of dispersive media is the Recursive Convolution (RC) method. In the Drude version it shows a not so good accuracy in describing the electromagnetic field at the plasmonic resonance frequencies. We propose here a modified RC algorithm which, by minimizing the time truncation error, guarantees a better accuracy of the solution at parity of memory requirements and number of time iterations. We test the modified RC algorithm proposed by analyzing the behavior of gold and silver noble metal nanospheres exposed to an optical plane wave with respect to the standard RC approach and the analytical solution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
