Influence temperature and electric field on propagation properties of a nematic liquid crystals optical fiber device

Moś, Joanna E.; Florek, Mariusz; Wonko, R.; Stasiewicz, Karol A.; Jaroszewicz, Leszek R.

doi:10.1117/12.2271042

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…It is well known that by the electrical voltage it is possible to reorient LC molecules in a predicted way [4,5]. When director of an LC device is reoriented, its optical properties change regarding refractive index changes from ordinary to extraordinary value [6]. The above phenomena are investigated in this paper.…”

Section: Introductionmentioning

confidence: 97%

Electro-Steering Tapered Fiber-Optic Device with Liquid Crystal Cladding

et al. 2019

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The paper presents the results of design, manufacturing, and characterization of a hybrid broad band in-line fiber-optic device. It uses nematic liquid crystal as cladding with electro-steering properties in a biconical optical fiber taper structure. Liquid crystal mixtures denoted as 6CHBT and E7 are designed for electric as well as temperature control of electromagnetic wave propagation in a broad wavelength range. The applied taper with 10±0.5 μm diameters has losses lower than 0.5 dB in whole investigated spectrum range. Three kinds of initial liquid crystal molecules’ orientations (parallel, orthogonal, and twist) in relation to the light beam propagating in a taper were applied. The performance of a tuned cladding was studied at an electric field of the range of 0–190 V and the temperature range from 20°C up to 42°C and 59°C for 6CHBT and E7, respectively. The induced reorientation of liquid crystal molecules was measured at a broad wavelength range (550-1550 nm).

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Section: Introductionmentioning

confidence: 97%

Electro-Steering Tapered Fiber-Optic Device with Liquid Crystal Cladding

et al. 2019

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“…Optical fibers are very important for building up a sensor in various areas such as molecular biology and medical science . By means of ingenious design or interface modification, optical fibers can be designed to detect several parameters, such as temperature, strain, refractive index (RI), pressure, or chemical compounds . For example, Ma et al reported a U‐bent fiber sensor, which was fabricated through photo‐planting thin polymer film on the surface of the optical fiber, for vapor phase sensing of explosives .…”

Section: Introductionmentioning

confidence: 99%

Resilient collapse of thermal sensitive polymer on the surface of the optical fiber taper

Zhuang

Cui

Huang

et al. 2018

J Polym Sci B Polym Phys

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In this work, collapse of poly(N-isopropyl-acrylamide) (pNIPAM) grafted on the surface of the optical fiber taper is probed by measuring fluorescence of rhodamine B solution at various temperatures. It is observed that the fluorescence intensity through the taper shows a nonlinear response to temperature. According to the optical model for the special designed taper, it is realized that the nonlinear response results from changing in effective refractive index of interfacial layer between taper and solution. Analysis on relationship between signal change and collapse process reveals a springback process during the collapse of pNIPAM chains. Such a novel phenomenon is further investigated on method for fluorescence measurement and molecular weight of the polymer. These results have not only revealed details of the collapse, but also establish a novel technique for study the collapse of thermal sensitive polymers on the surface.

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