Plasmonic color pixels fabricated by nanoimprint process
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SPECIAL SECTION: REGULAR PAPER International Symposium on Imaging, Sensing, and Optical Memory (ISOM’ 19), Niigata, Japan
Plasmonic color pixels fabricated by nanoimprint process Minoru Takeda1 · Ryo Takahara1 · Noriyuki Hasuike1 Received: 19 February 2020 / Accepted: 30 July 2020 © The Optical Society of Japan 2020
Abstract Plasmonic nanostructures or metasurfaces have recently been actively researched for structural color generation. Controlling the plasmonic resonant wavelengths of surface plasmon polaritons excited along the metal dielectric interfaces, arising from the resonant interaction with incident electromagnetic waves, reflection or transmission color can be effectively tuned in the visible wavelength region. However, the plasmonic structures are conventionally fabricated by electron beam lithography or focused ion beam, both so expensive and unproductive that they are not practical for large-scale production. In this report, we demonstrate a simple plasmonic nanostructure for various color generation fabricated by a quite simple and cost-effective method applying nanoimprint process and aluminum film deposition. We experimentally evaluated the reflectance spectra of the color pallets composed of the plasmonic nanostructures (plasmonic color pixels) and compared with the simulation results. We confirmed the wide-range tuning ability of reflection color by changing the size parameter of the plasmonic nanostructures. Therefore, this method for high-definitive color generation can be expected to be applied to a wide range of fields including various applications, such as security labels, anti-counterfeiting devices, information storage and functionalized decoration. Keywords Plasmonic nanostructure · Surface plasmon resonance · Nanoimprint process · FDTD simulation
1 Introduction Recently, plasmonic nanostructures or metasurfaces have been very actively researched for structural color generation, which was earlier realized by photonic crystals, inspired by natural beauty of form, for example, Morpho didus butterfly wings with a brilliant blue color generated by light interference in their nanostructured scales [1–3]. Printing color using plasmonic (metallic) nanostructures has several advantages over the conventional pigment or dyebased coloration in terms of printing resolution, durability and resource requirements [4–8]. Controlling the absorption peak wavelength of plasmonic resonances, which are standing waves of surface plasmon polaritons excited along the metal dielectric interfaces, arising from the resonant interaction with incident electromagnetic waves, reflection or * Minoru Takeda [email protected] 1
Department of Electronics, Kyoto Institute of Technology, Matsugasaki, Sakyou‑ku, Kyoto 606‑8585, Japan
transmission color can be effectively tuned in the entire visible wavelength region. Confining plasmon modes to small volumes specified by the metallic nanostructures enables subwavelength color printing. High-resolution color-printing technology is very promising for various applicatio
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