Optimization of Broadband Perfect Absorber by Weierstrass Factorization

Abstract

We present a new method based on Weierstrass factorization to optimize broadband perfect absorber (BPA) made of metal-dielectric-metal elements, which is an efficient and general approximation to calculate the absorption of these subwavelength structures. With the resonant wavelengths estimated by semi-analytical equations, we design a planar BPA tiling three subunits in one unit cell and a vertical tapered BPA stacking 20 pairs of metal-dielectric layers in one unit cell. Both BPAs shows almost over 90% and wide angle absorption in the concerned range. This method can be an alternative to the traditional full vector methods in initial design.

Structures, principles, and properties of metamaterial perfect absorbers

“…[96][97][98][99] But there remain many shortcomings. In terms of analysis methods, 100,101 although simulation software can optimize structural design and compensate for performance deficiencies through numerical algorithms, better analysis methods should be explored. In terms of structure, all media [102][103][104] and three-dimensional structured MPAs have great advantages in structural simplification, but there is currently very little research on these two aspects.…”

Inverse design in the complex plane: Manipulating quasinormal modes

“…For example, one way to approach the inverse design problem for absorbers is to try to move the QNM to a desired complex frequency [22]. In this way, one can tailor scattering effects [23], design absorbers [24], and manipulate exceptional points [25] with minimal numerical complexity. To date, however, these approaches address the forwards problem, finding how the pole moves if the resonator geometry is changed.…”