Electrically tunable filter based on plasmonic phase retarder and liquid crystals

Luc Driencourt; François Federspiel; Dimitrios Kazazis; Li-Ting Tseng; Richard Frantz; Yasin Ekinci; Rolando Ferrini; Benjamin Gallinet

doi:10.1117/12.2543569

26 February 2020 Electrically tunable filter based on plasmonic phase retarder and liquid crystals

Luc Driencourt, François Federspiel, Dimitrios Kazazis, Li-Ting Tseng, Richard Frantz, Yasin Ekinci, Rolando Ferrini, Benjamin Gallinet

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Proceedings Volume 11290, High Contrast Metastructures IX; 112901A (2020) https://doi.org/10.1117/12.2543569
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

An electrically tunable filter based on a plasmonic phase retarder and liquid crystal cells is reported. The plasmonic phase retarder consists of a periodic array of deep-subwavelength metallic nanostructures. A first entrance polarizer prepares the incident light in a polarization state oriented at 45° from the nanowires orientation. A strong phase retardation between TM and TE polarizations is induced by the plasmon resonances. A polarization analyzer based on liquid crystal cells allows to project the transmitted light onto a polarization state whose orientation depends on the applied voltage. Using this approach, a range of 8V is enough to span more than 70% of the area covered by standard RGB filters in CIE color coordinates with a single filter, including yellow, orange, red, magenta, purple, blue, cyan and green as well as different tones of white. In order to ensure the applicability to large area production, UV nanoimprint lithography (UV-NIL) and thin film coatings have been used to fabricate the plasmonic phase retarder. The evaporation is performed with an angle, so that a self-shadowing effects prevents full coverage of the surface. The resulting structure consists in a periodic array of silver nanowires. Multiple interfering resonances are observed so that the nominal transmission can reach levels above 70%. The construction of the colors transmitted by the tunable filter is modeled and validated through a series of optical characterization of the individual elements.

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Luc Driencourt, François Federspiel, Dimitrios Kazazis, Li-Ting Tseng, Richard Frantz, Yasin Ekinci, Rolando Ferrini, and Benjamin Gallinet "Electrically tunable filter based on plasmonic phase retarder and liquid crystals", Proc. SPIE 11290, High Contrast Metastructures IX, 112901A (26 February 2020); https://doi.org/10.1117/12.2543569

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KEYWORDS

Plasmonics

Wave plates

Polarizers

Liquid crystals

Polarization

Silver

Nanostructures

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