Photocontrol of selective light reflection by oblique helicoidal cholesteric

Kamal Thapa, Olena S. Iadlovska, Hari Krishna Bisoyi, Daniel A. Paterson, John M.D. Storey, Corrie T. Imrie, Quan Li, Sergij V. Shiyanovskii, Oleg D. Lavrentovich*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

1 Citation (Scopus)


An oblique helicoidal cholesteric ChOH represents a unique optical material with a pitch that can be tuned by an electric or magnetic field in a broad range from sub micrometers to micrometers. In this work, we demonstrate that the oblique helicoidal cholesteric doped with azoxybenzene molecules and stabilized by an electric field could also be tuned by light irradiation. At a fixed voltage, UV irradiation causes a redshift of the reflection peak by more than 200 nm. The demonstrated effect has the potential for applications such as smart windows, sensors, tunable lasers, and filters.

Original languageEnglish
Title of host publicationLiquid Crystals XXV
EditorsIam Choon Khoo
Number of pages8
ISBN (Electronic)9781510644526
Publication statusPublished - 3 Aug 2021
EventLiquid Crystals XXV 2021 - San Diego, United States
Duration: 1 Aug 20215 Aug 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceLiquid Crystals XXV 2021
Country/TerritoryUnited States
CitySan Diego

Bibliographical note

Funding Information:
The work was supported by the National Science Foundation grant ECCS-1906104.


  • Azoxybenzene derivatives
  • Electric field tuning of selective reflection
  • Hybrid surface anchoring
  • Infrared
  • Oblique helicoidal cholesteric
  • Photo tuning of selective reflection
  • Photoisomerization
  • Selective reflection in visible
  • Ultraviolet


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