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:https://doi.org/10.1117/12.733485

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

Yoshida, Hiroyuki; Lee, Chee Heng; Miura, Yusuke et al.

Proceedings of SPIE - the International Society for Optical Engineering, 2007, 6640, 664008

Number of Access:709（2025-09-02 10:21 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/76940

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Title	Tunable defect modes in chiral liquid crystals based on laser-induced modulation of helix
Creator	NRID 1000080550045 1000080550045 researchmap permalink hiroyukiyoshida hiroyukiyoshida Scopus Author ID 55628543086 55628543086 CreatorName Yoshida, Hiroyuki
	CreatorName Lee, Chee Heng
	CreatorName Miura, Yusuke
	NRID 1000080304020 1000080304020 ORCID 0000-0003-3142-1193 0000-0003-3142-1193 researchmap permalink read0054804 read0054804 Scopus Author ID 35413649300 35413649300 CreatorName Fujii, Akihiko
	NRID 1000050204186 1000050204186 ORCID 0000-0002-9556-4225 0000-0002-9556-4225 researchmap permalink read0014092 read0014092 Scopus Author ID 55490143900 55490143900 CreatorName Ozaki, Masanori
Subject	Cholesteric liquid crystals
	photonic crystals
	defect mode
	photo-chromism
Description	NanoScience + Engineering, 2007, San Diego, California, United States
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
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.
Publisher	SPIE
Source Title	Proceedings of SPIE - the International Society for Optical Engineering
Volume (Issue)	6640
Page	664008
Date of Issued	2007-09-25
Language	English
Handle URL	https://hdl.handle.net/11094/76940
PISSN	0277786X
NCID	AA10619755
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1117/12.733485
Access Rights	open access
oaire:version	Version of Record
Category	会議発表論文 Conference Paper

Resource Type	conference paper
Local Type	Conference Paper
DCMI Type	Text
DCTERMS.bibliographicCitation	Proceedings of SPIE - the International Society for Optical Engineering. 2007, 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	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2007-09-25
DC.identifier	https://doi.org/10.1117/12.733485
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.
DC.format	76940
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	English
citation_date	2007-09-25
citation_journal_title	Proceedings of SPIE - the International Society for Optical Engineering
citation_volume	6640
citation_firstpage	664008
citation_doi	https://doi.org/10.1117/12.733485
citation_public_url	https://hdl.handle.net/11094/76940

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

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