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Proceedings Paper

Electrically tunable filter based on plasmonic phase retarder and liquid crystals
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Paper 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.

Paper Details

Date Published: 26 February 2020
PDF: 6 pages
Proc. SPIE 11290, High Contrast Metastructures IX, 112901A (26 February 2020); doi: 10.1117/12.2543569
Show Author Affiliations
Luc Driencourt, CSEM Muttenz (Switzerland)
François Federspiel, Rolic Technologies Ltd. (Switzerland)
Dimitrios Kazazis, Paul Scherrer Institut (Switzerland)
Li-Ting Tseng, Paul Scherrer Institut (Switzerland)
Richard Frantz, Rolic Technologies Ltd. (Switzerland)
Yasin Ekinci, Paul Scherrer Institut (Switzerland)
Rolando Ferrini, CSEM Muttenz (Switzerland)
Benjamin Gallinet, CSEM Muttenz (Switzerland)

Published in SPIE Proceedings Vol. 11290:
High Contrast Metastructures IX
Connie J. Chang-Hasnain; Andrei Faraon; Weimin Zhou, Editor(s)

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