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    • 7. 发明公开
    • IRIDESCENT MATERIALS AND DEVICES
    • 红外材料和器件
    • EP1330666A1
    • 2003-07-30
    • EP01963218.1
    • 2001-09-03
    • Qinetiq Limited
    • LAWRENCE, Christopher RobertVUKUSIC, P., Thin Film Photonics Group School Phy.SAMBLES, J. R., Thin Film Photonics Group Sch. Phy
    • G02B5/18B44F1/14B41M3/14
    • B44F1/14B33Y80/00B42D25/328G02B5/1823G02B5/1866Y10S428/913Y10T428/24802Y10T428/24826
    • An iridescent material comprises a diffraction grating incorporating a plurality of sheets (1) of a first substantially transparent material in parallel alignment and spaced apart by quantities of a second substantially transparent material (2), the second material having a refractive index significantly lower than the refractive index of the first material, the plates being tilted at an angle υ to an axis X and the grating having a period d(X) in the direction of axis X, the angle υ and period d being such that a second diffraction grating is provided along an axis Z, perpendicular to axis X, the second diffraction grating having a period d(Z) and consisting of ten periods or less and whereby, the diffraction conditions of the grating can be simultaneously fulfilled by electromagnetic radiation of a range of wavelengths thereby causing iridescence. Materials according to the invention have applications in inter alia document security, anti-counterfeiting measures, artwork, gift wrapping paper and cards and clothing design.
    • 虹彩材料包括衍射光栅,所述衍射光栅包括平行排列的第一基本上透明材料的多个片材(1),所述第一基本透明材料以一定量的第二基本透明材料(2)间隔开,所述第二材料的折射率显着低于 所述第一材料的折射率,所述板相对于轴线X以角度υ倾斜并且所述光栅在轴线X的方向上具有周期d(X),所述角度υ和周期d使得第二衍射光栅为 沿着垂直于轴线X的轴线Z设置,第二衍射光栅具有周期d(Z)并且由十个周期或更少的周期组成,并且由此光栅的衍射条件可以通过一系列波长的电磁辐射同时实现 从而引起彩虹色。 根据本发明的材料尤其具有文件安全性,防伪措施,艺术品,礼品包装纸和卡片以及服装设计的应用。