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金属薄膜上制备的表面等离激元颜色滤波器具有很强的颜色可调性.在200nm厚的金膜上,通过聚焦离子束刻蚀,制备一系列周期逐渐变化的圆形、方形、矩形亚波长尺寸小孔方阵列表面等离激元颜色滤波器,改变入射光的偏振方向,观察其超透射滤波现象.研究发现:对于矩形小孔阵列,其透射光颜色随入射光偏振方向的变化而改变;而对于圆形、方形的小孔阵列,其透射光颜色对入射光的偏振方向并不敏感.分析表明,对于金膜上刻蚀的小孔结构,虽然结构的周期性导致的表面等离激元极化子会对透射光的颜色变化产生一定影响,但是随小孔形状变化的局域表面等离激元共振才是影响透射光颜色的决定性因素.如果入射光没有在小孔中激发出局域表面等离激元,则表面等离激元极化子对透射光的影响也会消失.根据不同形状小孔周期结构透射光颜色随入射光的偏振变化特点,制备出了包含两种小孔形状的复合周期结构.随着入射光偏振方向的改变,该结构会显示出不同的颜色图案.
The surface plasmon color filter fabricated on metal thin film has strong color tunability.A series of circular, square and rectangular Subwavelength square array surface plasmon color filter to change the polarization direction of the incident light and observe its super-transmission filtering phenomenon.It is found that the color of the transmitted light changes with the polarization direction of the incident light for a rectangular aperture array But the color of the transmitted light is not sensitive to the polarization direction of the incident light.For the small hole structure etched on the gold film, although the periodicity of the structure leads to the surface Plasmon polaritons can have some effect on the color change of transmitted light, but local surface plasmon resonance that varies with the shape of the aperture is the decisive factor affecting the transmitted light color. If the incident light is not in the aperture The influence of the surface plasmon polaritons on the transmitted light will disappear.According to the polarization of the transmitted light with the periodic structure of different shapes of small holes changes the color of the transmitted light Point, a composite periodic structure containing two kinds of small hole shapes is prepared, and the structure will show different color patterns as the polarization direction of incident light changes.