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Electrical Broad Tuning of Plasmonic Color Filter Employing an Asymmetric-Lattice Nanohole Array of Metasurface Controlled by Polarization Rotator
- Electrical Broad Tuning of Plasmonic Color Filter Employing an Asymmetric-Lattice Nanohole Array of Metasurface Controlled by Polarization Rotator
- Lee, Youngjin; Park, Min-Kyu; Kim, Seunguk; Shin, Jeong Hee; Moon, Cheil; Hwang, Jae Youn; Choi, Jun-Chan; Park, Heewon; Kim, Hak-Rin; Jang, Jae Eun
- DGIST Authors
- Lee, Youngjin; Kim, Seunguk; Shin, Jeong Hee; Moon, Cheil; Hwang, Jae Youn; Jang, Jae Eun
- Issue Date
- ACS Photonics, 4(8), 1954-1966
- Article Type
- Asymmetric Lattice; Bandpass Filters; Color; Controlled Polarization; Extraordinary Optical Transmission; Light Transmission; Liquid Crystal; Liquid Crystals (LCs); Metallic Films; Nanohole Array; Nanohole Arrays; Nematic Liquid Crystals; Optical Communication; Optoelectronic Devices; Passive Filters; Plasmonic Resonance; Plasmonic Resonances; Plasmons; Polarization; Refractive Index; Switching Polarization; Tunable Color; Tunable Color Filter; Tuning; Twisted Nematic Liquid Crystals
- Wide range of color change in nanohole array structure on a metal film have been successfully demonstrated using asymmetric-lattice design of nanoholes and an electrically switching polarization rotator. Recently, some studies have been reported that various color states were obtained in a single unit cell structure using extraordinary optical transmission (EOT) of nanopatterned structure, which could be one of the most important solutions for achieving ultrahigh integration density in optoelectronic devices. However, because they used the interfacial refractive index or dielectric constant as controlling factors for the color tuning, they were not capable of inducing a changeable range of color with different primary color states. To overcome this limitation, in this study, an asymmetric-lattice nanohole array design was integrated with an electrically controlled polarization rotator, employing a twisted nematic (TN) liquid crystal (LC). This simple structure of nanohole arrays with a rectangular lattice enabled mixed color states as well as precisely designed two different primary colors, by modulating the polarization of the incident light. The color-tuning shift was greater than 120 nm. Since the surface plasmonic (SP) modes on both sides, a top and a bottom interface, were matched better by the TN-LC layer assembled on the rectangular-lattice nanohole metal layer, the transmittance at the resonance peak wavelength was increased by 158% compared to that of the bare nanohole structure. The nanohole-array-on-metal-film simultaneously functions as an electrode, and this advantage, coupled with the low driving voltage of the TN-LC layer, can open new possibilities in applications to various optoelectronic device concepts. © 2017 American Chemical Society.
- American Chemical Society
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