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ProcSPIE_6640_664008
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論文情報
タイトル
Tunable defect modes in chiral liquid crystals based on laser-induced modulation of helix
著者
Yoshida, Hiroyuki
Yoshida, Hiroyuki
Lee, Chee Heng
Lee, Chee Heng
Miura, Yusuke
Miura, Yusuke
Fujii, Akihiko
Fujii, Akihiko
Ozaki, Masanori
Ozaki, Masanori
キーワード等
Cholesteric liquid crystals
photonic crystals
defect mode
photo-chromism
内容
NanoScience + Engineering, 2007, San Diego, California, United States
Hiroyuki Yoshida, Chee Heng Lee, Yusuke Miura, Akihiko Fujii, and Masanori Ozaki "Tunable defect modes in chiral liquid crystals based on laser-induced modulation of helix", Proc. SPIE 6640, Active Photonic Crystals, 664008 (25 September 2007). DOI: https://doi.org/10.1117/12.733485
抄録
A structural defect was introduced within the helical lattice of cholesteric liquid crystals to realize a tunable photonic defect mode in the selective reflection band, or the polarization sensitive photonic band-gap of the cholesteric liquid crystal. The cholesteric liquid crystal material was locally polymerized via a two-photon polymerization process and a finite unpolymerized region was left between two polymerized layers to act as the structural defect in which the helical pitch is different from the polymerized bulk. The structural defect was functionalized by first of all, rinsing the unpolymerized cholesteric liquid crystal, and then infiltrating a photo-chromic dye-doped cholesteric liquid crystal material into the gap. A defect mode was observed in the selective reflection band of the cholesteric liquid material at a wavelength depending on the contrast between the pitch at the defect and the bulk. The defect mode was tunable by applying heat or irradiating light at λ ~ 400 nm on the sample, which caused the shortening of the helix pitch of the cholesteric liquid crystal at the defect, therefore increasing the pitch contrast between the bulk and the defect. Reversible tuning of the defect mode was realized in an electrode-free cell.
公開者
SPIE
掲載誌名
Proceedings of SPIE - the International Society for Optical Engineering
巻
6640
開始ページ
664008
刊行年月
2007-09-25
ISSN
0277786X
NCID
AA10619755
DOI (出版社版)
info:doi/10.1117/12.733485
URL
http://hdl.handle.net/11094/76940
言語
英語
カテゴリ
会議発表論文 Conference Paper
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著者版フラグ
publisher
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text
DCTERMS.bibliographicCitation
Proceedings of SPIE - the International Society for Optical Engineering.6640 P.664008
DC.title
Tunable defect modes in chiral liquid crystals based on laser-induced modulation of helix
DC.creator
Yoshida, Hiroyuki
Lee, Chee Heng
Miura, Yusuke
Fujii, Akihiko
Ozaki, Masanori
DC.publisher
SPIE
DC.language" scheme="DCTERMS.RFC1766
英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF
2007-09-25
DC.identifier
info:doi/10.1117/12.733485
DC.identifier" scheme="DCTERMS.URI
http://hdl.handle.net/11094/76940
DC.subject
Cholesteric liquid crystals
photonic crystals
defect mode
photo-chromism
DC.description
NanoScience + Engineering, 2007, San Diego, California, United States
Hiroyuki Yoshida, Chee Heng Lee, Yusuke Miura, Akihiko Fujii, and Masanori Ozaki "Tunable defect modes in chiral liquid crystals based on laser-induced modulation of helix", Proc. SPIE 6640, Active Photonic Crystals, 664008 (25 September 2007). DOI: https://doi.org/10.1117/12.733485
DCTERMS.abstract
A structural defect was introduced within the helical lattice of cholesteric liquid crystals to realize a tunable photonic defect mode in the selective reflection band, or the polarization sensitive photonic band-gap of the cholesteric liquid crystal. The cholesteric liquid crystal material was locally polymerized via a two-photon polymerization process and a finite unpolymerized region was left between two polymerized layers to act as the structural defect in which the helical pitch is different from the polymerized bulk. The structural defect was functionalized by first of all, rinsing the unpolymerized cholesteric liquid crystal, and then infiltrating a photo-chromic dye-doped cholesteric liquid crystal material into the gap. A defect mode was observed in the selective reflection band of the cholesteric liquid material at a wavelength depending on the contrast between the pitch at the defect and the bulk. The defect mode was tunable by applying heat or irradiating light at λ ~ 400 nm on the sample, which caused the shortening of the helix pitch of the cholesteric liquid crystal at the defect, therefore increasing the pitch contrast between the bulk and the defect. Reversible tuning of the defect mode was realized in an electrode-free cell.
citation_title
Tunable defect modes in chiral liquid crystals based on laser-induced modulation of helix
citation_author
Yoshida, Hiroyuki
Lee, Chee Heng
Miura, Yusuke
Fujii, Akihiko
Ozaki, Masanori
citation_publisher
SPIE
citation_language
英語
citation_date
2007-09-25
citation_journal_title
Proceedings of SPIE - the International Society for Optical Engineering
citation_volume
6640
citation_firstpage
664008
citation_issn
0277786X
citation_doi
info:doi/10.1117/12.733485
citation_public_url
http://hdl.handle.net/11094/76940
citation_keywords
Cholesteric liquid crystals
photonic crystals
defect mode
photo-chromism