EIGER™ development and application to an IR frequency-selective surface

As presented in (Crruz-Cabera et al., 2008), our experimental counterparts have recently obtained exciting results for a frequency-selective surface (FSS) operating in the mid-wave to long-wave infrared frequency range. While that paper emphasizes fabrication and experimental results, it also includes a numerical validation check based on the EIGER electromagnetics simulation tool (the comparison shows favorable agreement). EIGER is a general purpose frequency-domain integral equation code that supports a variety of Greenpsilas functions (GFs), including 2D and 3D free space GFs, symmetry-plane GFs, periodic GFs, and layered media GFs. While the choice of integral equations as a modeling tool may first appear to be the most complex choice, the strength of this method lies in the fact that code generality is realized on the development of the corresponding Greenpsilas functions. In other words, the capability of integral-equation-based code to handle a wide variety of problems is obtained by incorporating more Greenpsilas functions into the software and furthermore, to complement the generality, code speedup can be obtained by taking advantage of the amenability of GFs to analytic techniques. For example, applications of EIGER at Sandia have addressed EMC and EMI problems including thin-slot coupling, periodic diffraction gratings for a petawatt laser, photonic band-gap structures, and electro- and magnetostatic problems for pulsed power and micromachine designs.