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Graded circular Bragg reflectors: a semi-analytical retrieval of approximate pitch profiles from Mueller-matrix data
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. Cinvestav Queretaro, Mexico.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-2749-8008
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-9229-2028
2019 (English)In: Journal of Optics, ISSN 2040-8978, E-ISSN 2040-8986, Vol. 21, no 12, article id 125401Article in journal (Refereed) Published
Abstract [en]

Graded pitch profiles are found in structurally chiral materials like cholesteric liquid crystals (CLC) and in the cuticle of some scarab beetles. In most cases, the pitch profile is determined from electron microscopy techniques. Recently, it was shown that approximate pitch profiles in the cuticle of scarab beetles can be retrieved through an analysis of the spectral dependence of maxima and minima in normalized Mueller-matrix data. The analysis relies on basic concepts of interference in thin films, properties of optical modes in chiral systems, and the condition for circular Bragg reflection. In this work, the consistency of the procedure is demonstrated by analysis of normalized Mueller matrices of circular Bragg reflectors calculated for three predefined pitch profiles with (1) a stepwise decrease, (2) a stepwise increase and, (3) an exponential increase. The procedure does not require knowledge of the full Mueller matrix and can be used for non-destructive analysis of pitch in CLC, beetle cuticle and similar structures.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 21, no 12, article id 125401
Keywords [en]
circular Bragg reflection; Mueller matrix; chiral structures; cholesteric liquid crystals
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-162045DOI: 10.1088/2040-8986/ab4dc7ISI: 000494698300001OAI: oai:DiVA.org:liu-162045DiVA, id: diva2:1370995
Note

Funding Agencies|ConacytConsejo Nacional de Ciencia y Tecnologia (CONACyT) [2018-000007-01EXTV-00169]; Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University [2009-000971]

Available from: 2019-11-18 Created: 2019-11-18 Last updated: 2020-01-09

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Mendoza, ArturoJärrendahl, KennethArwin, Hans
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