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dc.contributor.authorPan, Ci-Lingen_US
dc.contributor.authorPan, Ru-Pinen_US
dc.date.accessioned2014-12-08T15:24:40Z-
dc.date.available2014-12-08T15:24:40Z-
dc.date.issued2006en_US
dc.identifier.isbn0-8194-6177-6en_US
dc.identifier.issn0277-786Xen_US
dc.identifier.urihttp://hdl.handle.net/11536/17130-
dc.identifier.urihttp://dx.doi.org/10.1117/12.644527en_US
dc.description.abstractRecently, there have been increasing interests in the study of liquid-crystal-based devices for application in the submillimeter wave or THz frequency range. In this paper, we present recent progress in liquid crystal THz optics from our group. Using time-domain THz spectroscopy, we have determined the complex indices of refraction of nematic liquid crystals, 5CB, PCH5 and E7 from 0.2 to beyond 1 THz. Significantly, the birefrincrence of 5CB and E7 are found to be as large as 0.2 at THz frequencies, while the absorption is negligible. Electrical-field and magnetic-field-controlled birefringence in LC were also investigated. A tunable room-temperature THz phase shifter using magnetic-field-controlled birefringence in nematic 5CB gives a phase shift as large as 108 degrees at 1.0 THz. Phase shift exceeding 360 degrees at 1 THz, an important milestone, was realized by using a sandwiched LC (E7, Merck) cell as thick as 3 nun. The magnetically tuned LC phase shifter served as key components in a two-element tunable LC Lyot filter. The tuning range of the filter is from 0.388 to 0.564 THz or a fractional tuning range of similar to 40%. Our work clearly demonstrates the potential of liquid crystal devices for THz applications. Finally, we will present initial works on control of enhanced THz transmission through a metallic hole array with nematic liquid crystals. Our work clearly demonstrates the potential of liquid crystal devices for THz applications.en_US
dc.language.isoen_USen_US
dc.subjectTHzen_US
dc.subjectliquid-crystal devicesen_US
dc.subjectfar Infrareden_US
dc.subjectphase shiftersen_US
dc.subjectwave plateen_US
dc.subjectLyot filteren_US
dc.titleRecent progress in liquid crystal THz optics - art. no. 61350Den_US
dc.typeProceedings Paperen_US
dc.identifier.doi10.1117/12.644527en_US
dc.identifier.journalLiquid Crystal Materials, Devices, and Applications XIen_US
dc.citation.volume6135en_US
dc.citation.spageD1350en_US
dc.citation.epageD1350en_US
dc.contributor.department光電工程學系zh_TW
dc.contributor.departmentDepartment of Photonicsen_US
dc.identifier.wosnumberWOS:000238251400011-
Appears in Collections:Conferences Paper


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