All-Optical and Polarization-Independent Tunable Guided-Mode Resonance Filter Based on a Dye-Doped Liquid Crystal Incorporated with Photonic Crystal Nanostructure

Tzu Yuan Lin, Jian Hung Lin, Jia De Lin, Chia Chen Hsu, Chia Rong Lee

Research output: Contribution to journalArticle

Abstract

This work presents the design, fabrication, and characterization of a novel two-dimensional (2D) all-optical and polarization-independent tunable guided-mode resonance filter. This filter is composed of a 2D sub-wavelength photonic crystal nanostructure with a dye-doped liquid crystal layer in a doped-nanoparticle-induced homeotropic alignment. Experimental results show that the resonant wavelength of the filer can be all-optically and polarization-independently tuned for red- and blue-shifting if the cell is illuminated successively by UV and green beams. The all-optical and polarization-independent tunability of the filter is attributed to the phase transition between homeotropic (H) and isotropic (I) state, resulting in variations in the LC refractive index between the ordinary index (no) and refractive index in I state (ni) via either UV-beam-induced trans-cis or green-beam-induced cis-trans back isomerization. In addition, the optically tunable cycle of the filter is repeatable for many times without significant decay or damage. This filter has potential applications, such as optical filters in signal processing, optical switches in communications technology, and optical sensors.

Original languageEnglish
Article number8884717
Pages (from-to)820-826
Number of pages7
JournalJournal of Lightwave Technology
Volume38
Issue number4
DOIs
Publication statusPublished - 2020 Feb 15

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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