Special Section on Nanostructured Thin Films: Fundamentals and Applications

On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

[+] Author Affiliations
Hadar Krupsky Reisman

Ben Gurion University of the Negev, Department of Electrooptic Engineering and the Ilse Katz Center for Nanoscale Science and Technology, Beer Sheva 84105, Israel

Drew P. Pulsifer

Pennsylvania State University, Materials Research Institute and Department of Engineering Science and Mechanics, University Park, Pennsylvania 16802

Raúl J. Martín-Palma

Pennsylvania State University, Materials Research Institute and Department of Materials Science and Engineering, University Park, Pennsylvania 16802

Akhlesh Lakhtakia

Pennsylvania State University, Materials Research Institute and Department of Engineering Science and Mechanics, University Park, Pennsylvania 16802

Roman Dąbrowski

Military University of Technology, Institute of Chemistry, Department of New Technology and Chemistry, Kaliskiego Street 2, 00-908 Warsaw, Poland

Ibrahim Abdulhalim

Ben Gurion University of the Negev, Department of Electrooptic Engineering and the Ilse Katz Center for Nanoscale Science and Technology, Beer Sheva 84105, Israel

J. Nanophoton. 7(1), 073591 (May 09, 2013). doi:10.1117/1.JNP.7.073591
History: Received September 15, 2012; Revised April 17, 2013; Accepted April 18, 2013
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Abstract.  A structurally right-handed chiral sculptured thin film (STF) with a central 90 deg-twist defect was made by thermal evaporation of chalcogenide glass and the use of a serial bi-deposition process to exhibit a narrowband hole in the spectrum of the right-circularly polarized light reflected when right-circularly polarized light is normally incident on the chiral STF. In an attempt to build a tunable filter, the chiral STF was then infiltrated with a highly birefringent nematic liquid crystal (LC), which caused a linear reflectance peak to redshift by 350nm. But the circular Bragg phenomenon exhibited by the uninfiltrated chiral STF was greatly diminished owing to the similarity in the constitutive properties of the LC and the chalcogenide glass. No temperature dependence of the shifted peak was observed, which provided clear evidence that the LC molecules are not ordered inside the chiral STF but are randomly aligned instead.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Hadar Krupsky Reisman ; Drew P. Pulsifer ; Raúl J. Martín-Palma ; Akhlesh Lakhtakia ; Roman Dąbrowski, et al.
"On alignment of nematic liquid crystals infiltrating chiral sculptured thin films", J. Nanophoton. 7(1), 073591 (May 09, 2013). ; http://dx.doi.org/10.1117/1.JNP.7.073591


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