On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

Hadar Krupsky Reisman; Drew P. Pulsifer; Raúl J. Martín-Palma; Akhlesh Lakhtakia; Roman Dąbrowski; Ibrahim Abdulhalim

doi:10.1117/12.964414

10 October 2012 On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

Hadar Krupsky Reisman, Drew P. Pulsifer, Raúl J. Martín-Palma, Akhlesh Lakhtakia, Roman Dąbrowski, Ibrahim Abdulhalim

Proceedings Volume 8465, Nanostructured Thin Films V; 84651E (2012) https://doi.org/10.1117/12.964414
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

Abstract

A structurally right-handed chiral sculptured thin film (STF) with a central 90º-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. The chiral STF was then infiltrated with a highly birefringent nematic liquid crystal (LC), which caused a linear reflectance peak to redshift by ~350 nm, 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.

Citation Download Citation

Hadar Krupsky Reisman, Drew P. Pulsifer, Raúl J. Martín-Palma, Akhlesh Lakhtakia, Roman Dąbrowski, and Ibrahim Abdulhalim "On alignment of nematic liquid crystals infiltrating chiral sculptured thin films", Proc. SPIE 8465, Nanostructured Thin Films V, 84651E (10 October 2012); https://doi.org/10.1117/12.964414

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KEYWORDS

Liquid crystals

Molecules

Reflectivity

Refractive index

Chalcogenide glass

Thin films

Optical fibers

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