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Chiral nanostructures producing near circular polarization
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0002-6371-0638
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0001-9229-2028
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2014 (English)In: Optical Materials Express, ISSN 2159-3930, Vol. 4, no 7, 1389-1403 p.Article in journal (Refereed) Published
Abstract [en]

Optical properties of chiral nanostructured films made of Al1-xInxN using a new growth mechanism - curved-lattice epitaxial growth - are reported. Using this technique, chiral films with right- and left-handed nanospirals were produced. The chiral properties of the films, originating mainly from an internal anisotropy and to a lesser extent from the external helical shape of the nanospirals, give rise to selective reflection of circular polarization which makes them useful as narrow-band near-circular polarization reflectors. The chiral nanostructured films reflect light with high degree of circular polarization in the ultraviolet part of the spectrum with left- and right-handedness depending on the handedness of the nanostructures in the films.

Place, publisher, year, edition, pages
Optical Society of America , 2014. Vol. 4, no 7, 1389-1403 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-109241DOI: 10.1364/OME.4.001389ISI: 000338875100013OAI: oai:DiVA.org:liu-109241DiVA: diva2:737171
Available from: 2014-08-12 Created: 2014-08-11 Last updated: 2015-09-22Bibliographically approved
In thesis
1. Mueller matrix ellipsometry studies of nanostructured materials
Open this publication in new window or tab >>Mueller matrix ellipsometry studies of nanostructured materials
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Materials can be tailored on the nano-scale to show properties that cannot be found in bulk materials. Often these properties reveal themselves when electromagnetic radiation, e.g. light, interacts with the material. Numerous examples of such types of materials are found in nature. There are for example many insects and birds with exoskeletons or feathers that reflect light in special ways. Of special interest in this work is the scarab beetle Cetonia aurata which has served as inspiration to develop advanced nanostructures due to its ability to turn unpolarized light into almost completely circularly polarized light. The objectives of this thesis are to design and characterize bioinspired nanostructures and to develop optical methodology for their analysis.

Mueller-matrix ellipsometry has been used to extract optical and structural properties of nanostructured materials. Mueller-matrix ellipsometry is an excellent tool for studying the interaction between nanostructures and light. It is a non-destructive method and provides a complete description of the polarizing properties of a sample and allows for determination of structural parameters.

Three types of nanostructures have been studied. The rst is an array of carbon nanobers grown on a conducting substrate. Detailed information on physical symmetries and band structure of the material were determined. Furthermore, changes in its optical properties when the individual nanobers were electromechanically bent to alter the periodicity of the photonic crystal were studied. The second type of nanostructure studied is bioinspired lms with nanospirals of InxAl1–xN which reflect light with a high degree of circular polarization in a narrow spectral band. These nanostructures were grown under controlled conditions to form columnar structures with an internally graded refractive index responsible for the ability to reflect circularly polarized light. Finally, angle-dependent Mueller matrices were recorded of natural nanostructures in C. aurata with the objective to refine the methodology for structural analysis. A Cloude sum decomposition was applied and a more stable regression-based decomposition was developed for deepened analysis of these depolarizing Mueller matrices. It was found that reflection at near-normal incidence from C. aurata can be described as a sum reflection o a mirror and a left-handed circular polarizer. At oblique incidence the description becomes more complex and involves additional optical components.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 46 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1631
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-111947 (URN)10.3384/diss.diva-111947 (DOI)978-91-7519-200-0 (print) (ISBN)
Public defence
2014-12-12, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 09:15 (English)
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Supervisors
Available from: 2014-11-11 Created: 2014-11-11 Last updated: 2015-09-22Bibliographically approved

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