Tampere University of Technology

TUTCRIS Research Portal

Hot pen and laser writable photonic polymer films

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

Details

Original languageEnglish
Title of host publicationEmerging Liquid Crystal Technologies XI
PublisherSPIE
Volume9769
ISBN (Electronic)9781510600041
DOIs
Publication statusPublished - 2016
Externally publishedYes
Publication typeA4 Article in a conference publication
EventEmerging Liquid Crystal Technologies XI - San Francisco, United States
Duration: 16 Feb 201617 Feb 2016

Conference

ConferenceEmerging Liquid Crystal Technologies XI
CountryUnited States
CitySan Francisco
Period16/02/1617/02/16

Abstract

An orange-reflecting photonic polymer film has been fabricated based on a hydrogen-bonded cholesteric liquid crystalline (CLC) polymer consisting of non-reactive (R)-(+)-3-methyladipic acid as the chiral dopant. This polymer film can be patterned easily by evaporating the chiral dopant at specific locations with a hot pen or a laser beam. Removal of chiral dopant leads to a decrease in the helical pitch at the heat treated areas leading to a change in color from orange to green revealing a high contrast pattern. The photonic patterns are irreversible and stable at ambient conditions. This makes such a CLC polymer film interesting as writable photonic paper.

Keywords

  • Cholesteric liquid crystals, laser writing, patterned surface, photonic paper, thermal writing