TY - JOUR
T1 - Polarization Control by Using Anisotropic 3-D Chiral Structures
AU - Chen, Menglin L.N.
AU - Jiang, Li Jun
AU - Sha, Wei E.I.
AU - Choy, Wallace C.H.
AU - Itoh, Tatsuo
N1 - Funding Information:
This work was supported in part by the Research Grants Council of Hong Kong under Grant GRF 716713, Grant GRF 17207114, and Grant GRF 17210815, in part by NSFC under Grant 61271158, in part by Hong Kong under Grant ITP/045/14LP, in part by Hong Kong UGC under Grant AoE/PC04/08, in part by the Collaborative Research Fund from the Research Grants Council of Hong Kong, under Grant C7045-14E, and in part by CAS-Croucher Funding Scheme for Joint Laboratories under Grant CAS14601.
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2016/11
Y1 - 2016/11
N2 - Due to the mirror symmetry breaking, chiral structures show fantastic electromagnetic (EM) properties involving negative refraction, giant optical activity, circular dichroism and asymmetric transmission. Aligned electric and magnetic dipoles excited in chiral structures contribute to the extraordinary properties. However, the chiral structures that exhibit n -fold rotational symmetry show a limited tunability of the chirality. In this paper, we propose a compact, light, and highly tunable anisotropic chiral structure to overcome this limitation and realize a linear-to-circular polarization conversion. The anisotropy is due to simultaneous excitations of two different pairs of aligned electric and magnetic dipoles. The 3-D omega-shaped structure, etched on two sides of one printed circuit board (PCB) with connecting metallic vias, achieves 60% of linear-to-circular conversion (transmission) efficiency at the operating frequency of 9.2 GHz. The desired 90° phase shift between the two orthogonal linear polarizations is not only from the chirality but also from the anisotropic chiral response slightly off the resonance. The work enables elegant and practical polarization control of EM waves.
AB - Due to the mirror symmetry breaking, chiral structures show fantastic electromagnetic (EM) properties involving negative refraction, giant optical activity, circular dichroism and asymmetric transmission. Aligned electric and magnetic dipoles excited in chiral structures contribute to the extraordinary properties. However, the chiral structures that exhibit n -fold rotational symmetry show a limited tunability of the chirality. In this paper, we propose a compact, light, and highly tunable anisotropic chiral structure to overcome this limitation and realize a linear-to-circular polarization conversion. The anisotropy is due to simultaneous excitations of two different pairs of aligned electric and magnetic dipoles. The 3-D omega-shaped structure, etched on two sides of one printed circuit board (PCB) with connecting metallic vias, achieves 60% of linear-to-circular conversion (transmission) efficiency at the operating frequency of 9.2 GHz. The desired 90° phase shift between the two orthogonal linear polarizations is not only from the chirality but also from the anisotropic chiral response slightly off the resonance. The work enables elegant and practical polarization control of EM waves.
KW - Chiral structure
KW - circular polarizer
KW - polarization control
UR - http://www.scopus.com/inward/record.url?scp=84994877211&partnerID=8YFLogxK
U2 - 10.1109/TAP.2016.2600758
DO - 10.1109/TAP.2016.2600758
M3 - Journal article
AN - SCOPUS:84994877211
SN - 0018-926X
VL - 64
SP - 4687
EP - 4694
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 11
M1 - 7544481
ER -