Effect of Phase Retardation on Defect-Mode Lasing in Polymeric Cholesteric Liquid Crystals


  • This work is partly supported by TIT-KAIST Joint Program and JSPS Research for the Future program, 21st century COE program, and a Grant-in-Aid for Scientific Research on a Priority Area (B) (12129202) from the Ministry of Education, Science, Sports and Culture. B. Park is also supported by the q-PSI program at Hanyang University through KOSEF of the Republic of Korea and the stay of K.-C. Shin at TIT is supported by Samsung Electronics. T. M. Swager is grateful for financial support from the National Science Foundation.


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.