Chiral metamaterials with negative refractive index based on four “U” split ring resonators

Abstract

A uniaxial chiral metamaterial is constructed by double-layered four "U" split ring resonators mutually twisted by 90 degrees. It shows a giant optical activity and circular dichroism. The retrieval results reveal that a

Dual-Band Circular Polarizer and Linear Polarization Transformer Based on Twisted Split-Ring Structure Asymmetric Chiral Metamaterial

“…CMMs are of great current interest both for customized functionalities and for potential applications not found in natural medium arise from the magneto-electric cross coupling of chiral structures due to their lack of any mirror symmetry. As a fact, besides negative refractive index, CMMs can also achieve other exotic EM characteristics, such as giant gyrotropy [4], strong polarization rotation (giant optical activity) [5][6][7][8][9][10][11], circular polarizer (circular dichroism, CD effect) [12][13][14][15], asymmetric transmission (AT) effect [16][17][18][19][20][21], linear or/to circular polarization conversion [22][23][24][25][26][27][28][29][30][31][32], and even the prospect of a repulsive Casimir force [33,34] by special enantiomeric forms or similar chiral structure design. The cross-coupling is original physics of these special electromagnetic (EM) properties [35,36].…”

Ultra-Compact Multi-Band Chiral Metamaterial Circular Polarizer Based on Triple Twisted Split-Ring Resonator

“…The front DSRR pattern is formed by rotating an enantiometric form of the back DSRR by 90 • . This construction law in our design distinguishes any previous design with only a mutual 90 • twist or with only an enantiometric form [3][4][5][6][7][8][9]. Thus, the chirality of the design can be further enhanced.…”

“…Chiral metamaterials (CMMs) is lack of any mirror symmetry and also neither violates reciprocity nor time-reversal symmetry, which has been paid attention increasingly due to their exotic electromagnetic (EM) properties [1][2][3][4][5][6][7][8][9]. From microwave to optical ranges, negative refraction [1], giant gyrotropy [2], optical activity [3][4][5][6], circular dichroism (CD) [7][8][9], asymmetric transmission (AT) [10][11][12][13], and linear or/to circular polarization conversion [14][15][16] can be explored and realized by special CMM design.…”

“…From microwave to optical ranges, negative refraction [1], giant gyrotropy [2], optical activity [3][4][5][6], circular dichroism (CD) [7][8][9], asymmetric transmission (AT) [10][11][12][13], and linear or/to circular polarization conversion [14][15][16] can be explored and realized by special CMM design. Essentially, these unique EM properties mainly originate from cross-coupling of the electric and magnetic fields among these chiral structures [17][18][19][20][21][22][23].…”

Application of Chiral Layers and Metamaterials for the Reduction of Radar Cross Section

“…During the past several years, chiral metamaterials as a kind of artificial materials has attracted an enormous amount of interest that could be used to achieve many customized functionalities, such as the negative refraction and giant optical activity [10][11][12][13][14][15][16][17][18][19][20], and many other applications [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The constitutive equations for chiral media assuming a time harmonic dependence e jωt are [1]:…”