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Keywords:

  • Alignment;
  • Lasers;
  • Liquid crystal, columnar;
  • Photoisomerization

Graphical Abstract

Thumbnail image of graphical abstract

Circularly polarized infrared irradiation of a hexagonal columnar mesophase with a free-electron laser causes the liquid crystal to change from an “edge-on” alignment to a uniformly homeotropic “face-on” alignment (see Figure) due to vibrational excitation of the aromatic C–H vibration band of triphenylene.