Electro-tunable optical diode based on photonic bandgap liquid-crystal heterojunctions

Jisoo Hwang, Myoung Hoon Song, Byoungchoo Park, Suzushi Nishimura, Takehiro Toyooka, J. W. Wu, Yoichi Takanishi, Ken Ishikawa, Hideo Takezoe

Research output: Contribution to journalArticlepeer-review

298 Scopus citations


An optical heterojunction photonic bandgap (PBG) structure consisting of an anisotropic nematic layer sandwiched between two cholestric liquid-crystal layers with different helical pitches was investigated. A half-wave phase retarders layer made of planar nematic liquid crystal (NLC) was sandwiched two PBG CLC layers with the same sense of helix handedness but different pitches. The optical diode action in the optical heterojunction anisotropic structure (OHAS) was analyzed. With its advantages of easy fabrication and electro-tunability, it was found that the structure has wide potential application in photonic devices that make use of propagation-direction dependent operation.

Original languageEnglish
Pages (from-to)383-387
Number of pages5
JournalNature Materials
Issue number5
StatePublished - May 2005

Bibliographical note

Funding Information:
The laser dye used in this study was supplied from T. M. Swager (MIT). The work is supported by JSPS through the TIT-KAIST core university corroboration program, KOSEF through ABRL program at Ewha Womans University, 21st COE program of Materials Science in Tokyo Tech and a Grant-in-Aid for Exploratory Research (16656023) by the Ministry of Education, Science, Sports and Culture of Japan. Correspondence and requests for materials should be addressed to H.T.


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