On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A structurally right-handed chiral sculptured thin film (STF) with a central 90°-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.

Original languageEnglish
Title of host publicationNanostructured Thin Films V
DOIs
StatePublished - 1 Dec 2012
EventNanostructured Thin Films V - San Diego, CA, United States
Duration: 14 Aug 201216 Aug 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8465
ISSN (Print)0277-786X

Conference

ConferenceNanostructured Thin Films V
Country/TerritoryUnited States
CitySan Diego, CA
Period14/08/1216/08/12

Keywords

  • Liquid crystal
  • Photonic crystal
  • Sculptured thin film
  • Serial bi-deposition
  • Structural chirality
  • Tunable filters

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