Tunable single photonic defect-mode in cholesteric liquid crystals with laser-induced local modifications of helix

The authors demonstrate a tunable single photonic defect-mode in a single cholesteric liquid crystal material based on a structural defect introduced by local modification of the helix. An unpolymerized region of cholesteric liquid crystal acting as the defect was left between two polymerized region...

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Bibliographic Details
Published in:Applied physics letters 2006-12, Vol.89 (23)
Main Authors: Yoshida, Hiroyuki, Lee, Chee Heng, Fujii, Akihiko, Ozaki, Masanori
Format: Article
Language:English
Subjects:
CRYSTAL DEFECTS
EXCITATION
HEAT TREATMENTS
HEATING
LASERS
LIQUID CRYSTALS
MATERIALS SCIENCE
MODIFICATIONS
MULTI-PHOTON PROCESSES
PHOTONS
POLYMERIZATION
RED SHIFT
TEMPERATURE RANGE 0273-0400 K
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Summary:The authors demonstrate a tunable single photonic defect-mode in a single cholesteric liquid crystal material based on a structural defect introduced by local modification of the helix. An unpolymerized region of cholesteric liquid crystal acting as the defect was left between two polymerized regions via a two-photon excitation laser-lithography process. Upon polymerization, the cholesteric liquid crystal helix elongated and became thermally stable, and a single photonic defect mode was exhibited due to the contrast in the helix pitch at the defect. The defect mode showed tunability upon heating, and a 36nm redshift was seen over a temperature range of 30°C.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2400070