Parameter retrieval of chiral metamaterials based on the causality principle

Dynamic and tunable chiral metamaterials with wideband constant chirality over a certain frequency band

“…3(e)-(f), respectively. Then, the other retrieval parameters can be calculated by ± = ± , = ⁄ , and = [4][5][6][7][8][9][10][11][12][13]. In order to show the operating mechanism, it would worth to examine the electric field and current distribution of the proposed design.…”

“…They have gained a great deal of interest due to their large applicability in the development of efficient devices because of these features. There are many chiral MTM studies in the literature [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Unlike the other chiral MTM studies, this study presents a novel design having a very simple geometrical pattern which allows simplification in the manufacturing process and shows a strong chirality which is validated by both simulation and experimental studies.…”

“…They are characterized by the quantity of chirality parameter, = ( − ) 2 ⁄ , where ⁄ is ratio representing the refractive indexes of the right circularly polarized (RCP) and left circularly polarized (LCP) waves and high chirality values lead to negative refractive index [4][5][6][7][8][9][10][11][12][13]. Chiral MTMs are artificial and handmade structures.…”

Parameter retrieval of chiral metamaterials based on the state-space approach

“…Consider a dispersive chiral layer with thickness d = 1.6 mm ( Fig. 1) whose constitutive parameters have the following forms of frequency dependence (assuming e jωt time dependence) [27]: 2 10 − jf f 10 1 2 10 − jf f 10 1…”

“…This approach has been modified in [26] in order to extract effective parameters of CMMs by considering a CMM slab with thickness d illuminated by normal incidence of circularly polarized waves. Recently, an improved algorithm was derived based on Kramers-Kronig relations for the unique extraction of effective parameters of CMMs [27]. Briefly, in the standard full-wave parameter retrieval methods, the eigenwaves of the wave equation in an isotropic chiral layer are derived and the general form of electric and magnetic fields inside such an environment are determined.…”