title: Similar structures, different characteristics: circular dichroism of metallic helix arrays with single-, double-, and triple-helical structures.
abstract: We fabricated three-dimensional metallic helix arrays with single-, double-, and triple-helical structures. The transmission performances with the normal incident angle were measured in the microwave frequency of 12-18 GHz. For the single- and double-helical structures, giant circular dichroism with fairly wide bands is observed in the transmission spectra. However, the triple-helical structure does not exhibit circular dichroism. Based on the phenomenon of circular dichroism, the single- and double-helical structures can be used as broadband circular polarizers in the microwave region, but triple-helical ones cannot. The experiments have a good agreement with our simulation results, which were studied by the finite-difference time domain method.
authors.affiliation: School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Yang
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao
authors.forename: Lin
authors.initials: L
authors.lastname: Wu
authors.forename: Zeqin
authors.initials: Z
authors.lastname: Lu
authors.forename: Yongzhi
authors.initials: Y
authors.lastname: Cheng
authors.forename: Rongzhou
authors.initials: R
authors.lastname: Gong
authors.forename: Yu
authors.initials: Y
authors.lastname: Zheng
authors.forename: Jian
authors.initials: J
authors.lastname: Duan