Scattering of 1-D periodic scatterer and asymptotic comparison using the many-body iterative T-matrix method

- The applicability of the many-body iterative T-matrix (MBIT) method is extended.
- The MBIT method is applied to infinite scatterers with 1-D periodic finite structures.
- The MBIT solutions for infinite scatterers are validated by analytical or numerical counterparts.

The many-body iterative T-matrix (MBIT) method is based on the T-matrix method and focuses on scatterers with large aspect ratios. In this study, the MBIT method is extended so that it can be applied to an infinite scatterer with a 1-D periodic finite structure. A semi-analytical solution of infinite scatterers is obtained. In addition, the MBIT method is theoretically extended to include scatterers without axial rotational symmetry. The direct validation of the present method is performed by comparing the analytic solution for an infinite cylinder and the numerically accurate discrete dipole approximation method whereas indirect validation is conducted by using asymptotic solutions. Furthermore, the study also demonstrates that scattering properties of infinite scatterers can be used as a substitute for finite scatterers with large aspect ratios.