Invited Paper
Nanoplasmonics for Structural Colors on Consumer Products

Anders Kristensen DTU Nanotech, Technical University of Denmark, Kongens Lyngby, Denmark Jeppe Sandvik Clausen DTU Fotonik, Technical University of Denmark, Kongens Lyngby, Denmark Emil Højlund-NIelsen DTU Nanotech, Technical University of Denmark, Kongens Lyngby, Denmark Xiaolong Zhu DTU Nanotech, Technical University of Denmark, Kongens Lyngby, Denmark Meir Grajower Department of Applied Physics, The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel Alexander Bruun Christiansen DTU Nanotech, Technical University of Denmark, Kongens Lyngby, Denmark Sadegh Yazdi DTU CEN, Technical University of Denmark, Kongens Lyngby, Denmark Hesham Taha Nanonics Imaging Ltd., Nanonics Imaging Ltd., Jerusalem, Israel Uriel Levy Department of Applied Physics, The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel Niels Asger Mortensen DTU Fotonik, Technical University of Denmark, Kongens Lyngby, Denmark

This paper describes plasmonic colors based on the concept of localized surface plasmon resonances (LSPR) for decoration of high volume manufactured plastic products. A palette of bright and angle-insensitive colors, spanning the entire visible spectrum, is realized by utilizing the hybridization between LSPR modes in aluminium nano-disks, and nano-holes. Research grade, clean-room fabricated plasmonic metasurfaces are transferred to industrial production of plastic consumer products. Plastic components are embossed or injection moulded with a nano-textured surface, comprising an array of nano-scale pillars. The master-original for the square-centimeter nano-texture is realized by means fast e-beam writing or colloidal lithography. The nano-disk/nano-hole plasmonic metasurface is formed when a thin film of aluminium is deposited on top of the nanopillar array. The nanotextured plasmonic metasurface is covered with a transparent protective coating, which can withstand the daily life handling.

This approach also supports a cradle-to-cradle production philosophy: Plastic products can be injection moulded using a single plastic base material, where the color decoration is realized by the as-injection-moulded nano-textured surface, covered by a thin (10-20 nm) metal film plus a 1-20 µm protective coating. After use, the product can be grinded, where the thin film coatings, which are the same for all products, represents a contamination level in the sub ppm level of the base material granulate – which is thereby directly re-usable.

anders.kristensen@nanotech.dtu.dk









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