Electro-tunable liquid crystal waveguide laser

Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United StatesTatsunosuke Matsui, Masanori Ozaki, and Katsumi Yoshino "Electro-tunable liquid crystal waveguide laser", Proc. SPIE 5518, Liquid Crystals VIII, (15 October 2004). DOI: https://doi.org/10.1117/12.55749

Electro-tunable laser action in a dye-doped nematic liquid crystal waveguide under holographic excitation

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Tatsunosuke Matsui, Masanori Ozaki, and Katsumi Yoshino, Appl. Phys. Lett. 83, 422 (2003) and may be found at https://doi.org/10.1063/1.1593827

Photoinduced layer alignment control in ferroelectric liquid crystal with N*-C* phase transition doped with photochromic dye

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Tatsunosuke Matsui, Keizo Nakayama, Masanori Ozaki, and Katsumi Yoshino, Appl. Phys. Lett. 76, 1228 (2000) and may be found at https://doi.org/10.1063/1.125992

Efficient Optical Modulation of Terahertz Transmission in Organic and Inorganic Semiconductor Hybrid System for Printed Terahertz Electronics and Photonics

Highly efficient optical modulation of terahertz (THz) transmission through Si substrate coated with thin layer of organic π-conjugated materials was investigated under various laser light irradiation conditions using THz time-domain spectroscopy. As in the pioneering work by Yoo et al. [Yoo et al., Applied Physics Letters. 2013;103:151116-1–151116-3.], we also used copper phthalocyanine (CuPc). It was perceived that the charge carrier transfer from Si to CuPc is crucial for the photo-induced metallization and efficient optical modulation of THz transmission. We found that the thickness of CuPc layer is a critical parameter to realize high charge carrier density for efficient THz transmission modulation. We also fabricated a split-ring resonator (SRR) array metamaterial on CuPc-coated Si utilizing superfine inkjet printer and succeeded in obtaining efficient modulation of resonant responses of SRR array metamaterials by laser light irradiation. We have further investigated THz transmission modulation through Si substrates coated with another four solution-processable π-conjugated materials. Two of them are π-conjugated low molecules such as the [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene), and another two are the π-conjugated polymer materials such as poly[5-(2-ethylhexyloxy)-2-methoxycyanoterephthalyliden] (MEH-CN-PPV) and poly(benzimidazobenzophenanthroline) (BBL). Among these four π-conjugated materials, PCBM- and TIPS-pentacene showed better modulation efficiencies even higher than CuPc. Our findings may open the way to fabricating various types of THz active devices utilizing printing technologies

Electrically color-tunable defect mode lasing in one-dimensional photonic-band-gap system containing liquid crystal

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Ryotaro Ozaki, Tatsunosuke Matsui, Masanori Ozaki, and Katsumi Yoshino, Appl. Phys. Lett. 82, 3593 (2003) and may be found at https://doi.org/10.1063/1.1577829

Laser actions in nano-helical-structured liquid crystals

Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United StatesMasanori Ozaki, Ryotaro Ozaki, Tatsunosuke Matsui D.D.S., and Katsumi Yoshino "Laser actions in nano-helical-structured liquid crystals", Proc. SPIE 5518, Liquid Crystals VIII, (15 October 2004). DOI: https://doi.org/10.1117/12.55554