Optically tuneable blue phase photonic band gaps

Hu Yi Liu, Chun Ta Wang, Chiao Yun Hsu, Tsung Hsien Lin, Jui Hsiang Liu

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


This study investigates an optically switchable band gap of photonic crystal that is based on an azobenzene-doped liquid crystal blue phase. The trans-cis photoisomerization of azobenzene deforms the cubic unit cell of the blue phase and shifts the photonic band gap. The fast back-isomerization of azobenzene was induced by irradiation with different wavelengths light. The crystal structure is verified using Kossel diffraction diagram. An optically addressable blue phase display, based on Bragg reflection from the photonic band gap, is also demonstrated. The tunable ranges are around red, green, and blue wavelengths and exhibit a bright saturated color.

Original languageEnglish
Article number121103
JournalApplied Physics Letters
Issue number12
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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