Effect of thick anisotropic NLC layer on lasing in polymeric cholesteric liquid crystals.

TitleEffect of thick anisotropic NLC layer on lasing in polymeric cholesteric liquid crystals.
Publication TypeJournal Article
Year of Publication2005
AuthorsSong, MH, Shin, K-C, Park, B, Takanishi, Y, Ishikawa, K, Watanabe, J, Takezoe, H, Nishimura, S, Toyooka, T, Zhu, Z, Swager, TM
JournalJournal of the Korean Physical Society
Volume46
PaginationS265–S268
ISSN0374-4884
Keywordspolymeric cholesteric liq crystal lasing anisotropic NLC layer effect
Abstract

We have studied the lasing characteristics from a dye-doped nematic liq. crystal layer sandwiched by two polymeric cholesteric liq. crystal films as photonic band gap materials. The nematic layer possessing birefringence brings about the following remarkable optical characteristics: (1) reflectance in the photonic band-gap (PEG) region exceeds 50 %, due to the retardation effect, being unpredictable from a single CLC film; (2) efficient lasing occurs at the notch of PEG; (3) the lasing emissions contain both right- and left-circular polarizations. In this study, we demonstrate that a 100-$μ$m-thick nematic liq. crystal layer system shows several dips, resulting in multi-mode lasing actions just at the dips within PBG. [on SciFinder(R)]