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金膜上亚波长小孔阵列表面等离激元颜色滤波器偏振性质*
Polarization properties of plasmonic color filters comprised of arrays of subwavelength size holes on Au films*
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摘要: 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200 nm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。Abstract: Plasmonic color filters comprised of metal films can be adjusted easily. Periodic arrays of subwavelength size holes with circle, square and rectangular shape are fabricated on 200 nm thick Au films by using focused ion beam. The structures are utilized as plasmonic color filters for exhibiting color variation under the illumination of white light in different polarization directions. We find that for rectangular hole arrays, the color of the transmitted light changes greatly with polarization direction. However, for arrays of circle and square holes, color of the transmitted light is not sensitive to the polarization direction of incident light. We conclude that localized surface plasmon around a single hole is a key factor in influencing the color of transmission light, rather than surface plasmon polaritons induced by periodic arrays. If incident light does not excite the localized surface plasmon around the holes, the effect of surface plasmon polariton will disappear, Based on different display colors of transmitted light of the subwavelength holes with polarization, a composite color display sample is prepared, which will exhibit different color patterns as the polarization direction of incident light changes.
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