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Iwao Kawayama

As seen in: Optica
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Articles

Influence of dichroism on the optical properties of a twisted nematic liquid crystal cell in the terahertz region

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By Iwao Kawayama, Hayato Sekiya, Ryota Ito, Toshiaki Nose
| Optica Verified
Abstract Polarization control is essential in terahertz (THz) imaging. Liquid crystals (LCs) have the potential to functionalize tunable polarization-control devices. Here, a twisted nematic (TN) cell using a hydrogen-bonded LC is fabricated, and the influence of dichroism in the THz region is discussed. Our results indicate that the polarization state in the Gooch–Tarry minimum condition is affected by the LC dichroism; a nondichroic LC is required for complete linearly polarized output.
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Scanning laser terahertz near-field reflection microscope for biological analysis

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By Gaétan Macgrogan, Amel Al-Ibadi, Hironaru Murakami, Iwao Kawayama
| osapublishing.org
Author Affiliations Kosuke Okada,1 Kazunori Serita,1 Zirui Zang,1,2 Hironaru Murakami,1 Iwao Kawayama,1 Quentin Cassar,3 Amel Al-Ibadi,3 Gaëtan MacGrogan,4 Thomas Zimmer,3 Jean-Paul Guillet,3 Patrick Mounaix,3 and Masayoshi Tonouchi1,* 1Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871 Japan 2The Institute of Optics, University of Rochester, 480 Intercampus Drive River Campus, Rochester, NY 14627, USA 3Integration: from Material to Systems Laboratory, UMR...
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