Concurrent measurement of linear birefringence and dichroism in ferrofluids using rotating-wave-plate Stokes polarimeter |
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| Authors: | Jing-Fung Lin Meng-Zhe Lee |
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| Institution: | 1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China;2. College of Computer Science and Software Engineering, Shenzhen University, Shen Zhen, Guang Dong 518060, China;3. School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China;1. Department of Materials Science and Engineering, Chemical Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan, ROC;2. Department of Chemical Engineering, Feng Chia University, 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan, ROC;3. Department of Chemical Engineering, National Chung Hsing University, Eng Bld 3, 250 Kuo Kuang Road, 402 Taichung, Taiwan;1. «Gheorghe Asachi» Technical University of Iasi, Department of Natural and Synthetic Polymers, Bd. Prof. D. Mangeron 73, 700050 Iasi, Romania;2. «Costin D. Nenitescu» Centre of Organic Chemistry, 202 B Splaiul Independentei, 71141 Bucharest, Romania;3. «Petru Poni» Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, 700487 Iasi, Romania |
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| Abstract: | In this study, an optical scheme based on Stokes–Mueller Formalism and rotating-wave-plate Stokes polarimeter is successfully developed for obtaining concurrent measurements of the linear birefringence and dichroism. For a quarter-wave plate sample, the measured values of the principal axis angle and retardance are found to have average absolute and normalized errors of 0.0859° and 0.76%, respectively, while the measured dichroism of the quarter-wave plate has an average value of 0.0203. When analyzing ferrofluid film samples with concentrations ranging from 2 to 6%, it was found that for a given concentration of ferrofluid, retardance increases with applied magnetic fields and tends to saturate at high levels. Additionally, under the condition of the same magnetic field, the experimental results show that retardance is proportional to the concentration; the higher concentration will result in more retardance and absorption. Consequently, the derived algorithm for concurrent measurements of the linear birefringence and dichroism is feasible, and the relation between the concentration and magneto-optical effect was successfully investigated. |
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