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Light-induced Tuning of Microfiber-knot Resonator Overlaid with Azobenzene-doped Nematic Liquid Crystals

Published online by Cambridge University Press:  08 March 2011

Vincent K.S. Hsiao ,
Zhe Chen ,
Min-Chi Jheng ,
Xiaoqing Li  and
Jianhui Yu
Vincent K.S. Hsiao
Affiliation:
Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University No 1, University Rd. Puli, Nantou Hsien, 54561, Taiwan
Zhe Chen
Affiliation:
Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Jinan University, Guangzhou, China, 510632. Email: thzhechen@jnu.edu.cn
Min-Chi Jheng
Affiliation:
Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University No 1, University Rd. Puli, Nantou Hsien, 54561, Taiwan
Xiaoqing Li
Affiliation:
Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Jinan University, Guangzhou, China, 510632. Email: thzhechen@jnu.edu.cn
Jianhui Yu
Affiliation:
Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Jinan University, Guangzhou, China, 510632. Email: thzhechen@jnu.edu.cn
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Abstract

This paper demonstrates light-induced tuning of optical spectrum from optical microfiber knot resonator overlaid with an azobenzene-doped nematic liquid crystal (azo-doped NLC). The high-quality fiber resonator is made by drawing the single mode fiber to the micro-size diameter and self-twisting the microfiber as a knot shape. During the UV light irradiation the azobenzene molecules perform trans-to-cis photoisomerization which disrupts the NLC orientation. The disrupted NLC changes the effective refractive index within the LC overlaid fiber area and shifts the optical spectrum of microfiber knot resonator. The 0.25 nm spectral shifting of resonance wavelength was observed under the irradiation of 50 mW UV light.

Keywords

fiberliquid crystaloptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1293: Symposium L – Liquid-Crystal Materials—Beyond Displays , 2011 , mrsf10-1293-l05-04
Copyright
Copyright © Materials Research Society 2011

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References

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