Tunable defect modes in chiral liquid crystals based on laser-induced modulation of helix

Yoshida, Hiroyuki; Lee, Chee Heng; Miura, Yusuke; Fujii, Akihiko; Ozaki, Masanori

doi:info:doi/10.1117/12.733485

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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
内容	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

著者版フラグ	publisher
NII資源タイプ	会議発表論文
ローカル資源タイプ	会議発表論文
dcmi資源タイプ	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
DC.description	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

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