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个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职：光电工程与仪器科学学院院长、党委副书记
其他任职：辽宁省先进光电子技术重点实验室副主任，大连市新型功能材料与光电子器件重点实验室主任，中国超材料学会理事，中国机械工程学会极端制造分委员会委员，国际先进材料学会会士，Microsystems&Nanoengineering、chemosensors等期刊副编辑
性别：男
毕业院校：布里斯托尔大学
学位：博士
所在单位：光电工程与仪器科学学院
学科：光学工程. 电磁场与微波技术. 光学. 测试计量技术及仪器. 精密仪器及机械
办公地点：研教楼706
联系方式：0411-84706156
电子邮箱：caotun1806@dlut.edu.cn
Enhancement of circular dichroism by a planar non-chiral magnetic metamaterial
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论文类型：期刊论文
发表时间：2012-08-01
发表刊物：Journal of Optics (United Kingdom)
收录刊物：EI、Scopus
卷号：14
期号：8
ISSN号：20408978
摘要：We investigate the polarization properties of an elliptical nanohole array (ENA) penetrating through a metal/insulator/metal (MIM) film in the visible wavelength region. The calculated transmission spectra reveal that such a non-chiral magnetic planar metamaterial exhibits a strong transmission circular dichroism (CD). The proposed structure exhibits two surface plasmon polariton (SPP) modes polarized along the short and long diameters of the elliptical nanoholes at oblique incidence. When the elliptical nanoholes form a chiral arrangement with off-normal incidence, the two different polarization modes introduce a net polar vector that forms a chiral triad resulting in transmission CD, even though the MIM perforated with an ENA is a non-chiral structure. We also show that the transmission CD can be enhanced in an MIM-ENA compared with a single metal layer-ENA. This effect is due to the MIM-ENA allowing local magnetic dipole moments, hence increasing the polarization effects compared with a single metal layer-ENA where only electric dipole moments occur. The magnitude of the transmission CD can be tuned by modifying the geometrical parameters of the ENA. ? 2012 IOP Publishing Ltd.