Circular depolarization spectroscopy: A new tool to study photo-imprinting of chirality

Chidambar Kulkarni, Hirotoshi Sakaino, Ghislaine Vantomme, Stefan C.J. Meskers (Corresponding author)

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Abstract

When irradiating a molecular material containing photo-isomerizable groups with pure circularly polarized light, a particular handedness may get imprinted into the material. To study the mechanism and kinetics of this process in situ and operando, we have developed a new chiroptical tool where the circular polarization of the incident circularly polarized light is monitored after transmission through the photoactive layer. Practical limits to the resolution and sensitivity of the measurements as well as its calibration are discussed. To aid interpretation of experimental results, we present kinetic Monte Carlo simulations on a model for the active material involving photo-induced reorientation of molecules in a cholesteric organization. The simulations support the interpretation of a transient minimum in the degree of circular polarization of the transmitted light in terms of a nematic transient state during photo-inversion of a cholesteric organization in the molecular material.

Original languageEnglish
Pages (from-to)147-154
Number of pages8
JournalChirality
Volume35
Issue number3
DOIs
Publication statusPublished - Mar 2023

Bibliographical note

Funding Information:
We thank E.W. Meijer for stimulating discussion and encouragement.

Keywords

  • azobenzene photo-isomerization
  • cholesteric polymers
  • circular polarization
  • kinetic Monte Carlo simulations
  • photon counting
  • π-conjugated polymers

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