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Birefringence of nanocrystalline chitin films studied by Mueller-matrix spectroscopic ellipsometry
CINVESTAV, Mexico.
CINVESTAV, Mexico.
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-2749-8008
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-9229-2028
2016 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 6, no 2, 671-681 p.Article in journal (Refereed) Published
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Abstract [en]

Birefringent chitin films were prepared by a dipping technique from aqueous suspensions of chitin nanocrystals in a nematic liquid crystal phase. In the films, chitin nanocrystals are preferentially oriented along the withdrawal direction. Normal incidence transmission Mueller-matrix (M) spectroscopic ellipsometry measurements as a function of sample rotation were used to investigate the optical birefringence in the spectral range 0.73 to 5 eV. Analysis of eigenvalues and depolarization data reveal that the Mueller matrix corresponds to a pure retarder for photon energies below 4 eV and is depolarizing in the range 4 to 5 eV. By modeling the chitin film as a slab with in-plane anisotropy the birefringence was determined. The determination of birefringence was extended to include the range of 4 to 5 eV by a differential decomposition of M. (C) 2016 Optical Society of America

Place, publisher, year, edition, pages
OPTICAL SOC AMER , 2016. Vol. 6, no 2, 671-681 p.
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Physical Sciences
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URN: urn:nbn:se:liu:diva-127060DOI: 10.1364/OME.6.000671ISI: 000372039500041OAI: oai:DiVA.org:liu-127060DiVA: diva2:919379
Note

Funding Agencies|Concayt-Mexico; Knut and Alice Wallenberg foundation; Swedish Research Council; Carl Tryggers foundation; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]

Available from: 2016-04-13 Created: 2016-04-13 Last updated: 2017-11-30

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Järrendahl, KennethArwin, Hans

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