Effect of Phase Retardation on Defect-Mode Lasing in Polymeric Cholesteric Liquid Crystals (pages 779–783)
M. H. Song, B. Park, K.-C. Shin, T. Ohta, Y. Tsunoda, H. Hoshi, Y. Takanishi, K. Ishikawa, J. Watanabe, S. Nishimura, T. Toyooka, Z. Zhu, T. M. Swager and H. Takezoe
Article first published online: 19 MAY 2004 | DOI: 10.1002/adma.200306360
Lasing via a phase retardation defect mode is reported for the first time. The Figure shows the far-field pattern of laser emission realized by inserting an anisotropic nematic liquid crystal (LC) defect layer between polymer cholesteric LC layers. The system mimics the cuticle of Plusiotis resplendens, a beetle, using the birefringence of the anisotropic layer to achieve reflectance greater than the 50 % provided by simple cholesteric LC photonic bandgaps.