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Molecular Crystals and Liquid Crystals Volume 561, 2012 - Issue 1: Proceedings of the 14th International Topical Meeting: Optics of Liquid Crystals (OLC 2011): Part III of III
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Original Articles

Tunable Terahertz Filter Using an Etalon with a Nematic Liquid Crystal Layer and its Response Speed

Takayuki Kumagai Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
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Ryouta Ito Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan; Department of Electronics and Information System, Akita Prefectural University, Yurihonjo, Akita, 015-0055, Japan
,
Kei Takeya Institute of Laser Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
,
Hiroyuki Yoshida Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
,
Hitoshi Kubo Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
,
Akihiko Fujii Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
,
Toshiaki Nose Department of Electronics and Information System, Akita Prefectural University, Yurihonjo, Akita, 015-0055, Japan
,
Masayoshi Tonouchi Institute of Laser Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
&
Masanori Ozaki Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
 show all
Pages 82-88 | Published online: 13 Jun 2012
 
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Abstract

We demonstrate a tunable terahertz (THz) filter using an etalon with a nematic liquid crystal (NLC) layer. The etalon is composed of water-free fused silica glass plates and air layers, and contains a 75 μm-thick defect layer filled with homeotropically-aligned NLCs. Frequency tuning of the transmission peak is achieved by applying an in-plane electric field across the NLC layer: the transmission peak shifts from 1.025 THz to 1.013 THz. The obtained rise and decay times are 5.3 s and 12.2 s respectively and found to be 10 times faster than previous THz LC devices because of the thin NLC layer.

Acknowledgment

This study was supported by a Grant-in-Aid for Research Fellowships from the Japan Society for the Promotion of Science (JSPS) for Young Scientist and a Grant-in-Aid from Osaka University Global Center of Excellence (GCOE) Program.

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