Journal
LIQUID CRYSTALS
Volume 49, Issue 1, Pages 50-58Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2021.1943025
Keywords
Blue liquid crystal; hollow optical fibre; long period fibre grating; photopolymerisation-induced phase separation
Funding
- Ministry of Science and Technology of Taiwan [MOST 108-2221-E-239-022-]
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A novel method for realizing LPFG based on BPLC composites was proposed and experimentally demonstrated, showing cost-effectiveness and high flexibility in manufacturing the grating structure in an all-fibre system. The study investigated the optimum PIPS process conditions critical for reliable LPFG-based fibre devices, offering great potential for photonic applications.
A relatively simple and cost-effective method to realise a novel long-period fibre grating (LPFG) based on blue phase liquid crystal (BPLC) composites was proposed and experimentally demonstrated by implementing photopolymerisation-induced phase separation (PIPS) through a binary photomask. The BPLC-polymer composite zones were obtained by a process of periodic ultraviolet light with phase separation of the BPLC molecules and UV-curable monomer mixture. The appearance and optical characteristics of the proposed LPFGs have been studied experimentally. Experimental results show that optimum PIPS process conditions are critical for achieving a reliable LPFG-based fibre device. Compared with the previously reported methods, this new technique for designing and making an LPFG is more cost-effective and highly flexible due to the ease in manufacturing of the grating composite structure in the all-fibre system, which can provide great potential for photonic applications.
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