The 27 th International Korea-Japan Seminar on Ceramics

Transcription

1 The 27 th International Korea-Japan Seminar on Ceramics 23 rd 26 th November 2010 Songdo Convensia, Incheon, Korea Organized by Organizing Committee of the 27 th International Korea-Japan Seminar on Ceramics Executive Committee of the 27 th International Korea-Japan Seminar on Ceramics Sponsored by

2 Program Oral Session Glass and Opto-materials (GO-I) November 25 th, 2010 Hall D 13:30-15:15 [ Chair: Prof. Junji NISHII & Prof. Shixun DAI ] GO-I-04 GO-I-03 Novel Low-Tg Glasses used in Nanoimprinting for Subwavelength Structure Optical Devices Naoyuki KITAMURA 1, Kohei FUKUMI 1, Junji NISHII 2 ( 1 Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology ; 2 Research Institute for Electronic Science, Hokkaido University) Quantum Dots-doped Silica Glass Fibers for Advanced Optical Devices Pramod R. WATEKAR 1, Seongmin JU 1, Won -Taek HAN 2 ( 1 Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology ; 2 Graduate Program of Photonics and Applied Physics/Dept. of Information and Communications, Gwangju Institute of Science and Technology) GO-O-04 Local Heating from the Metal Nanoparticles and Their Effects on the Emission Properties of Rare-Earth Ions in Oxyfluoride Glasses Chao LIU, Jong HEO (Center for Information Materials and Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) GO-O-08 Three-dimensional SiO 2 Surface Structures Fabricated using Femtosecond Laser Lithography Hiroaki NISHIYAMA 1, Mizue MIZOSHIRI 2, Yoshinori HIRATA 2, Junji NISHII 1 ( 1 Research Institute for Electronic Science, Hokkaido University ; 2 Graduate School of Engineering, Osaka University) GO-O-07 Optical and Plasma Etching Characteristics of Rare-earth Element Containing Y 2 O 3 -SiO 2 - Al 2 O 3 Glass Jungki LEE 1, Seongjin HWANG 1, Sungmin LEE 2, Hyungsun KIM 1 ( 1 School of Materials Engineering, Inha University ; 2 Korea Institute of Ceramic Engineering and Technology) Oral Session Glass and Opto-materials (GO-II) November 25 th, 2010 Hall D 15:30-17:30 [ Chair: Prof. Jong HEO & Dr. Naoyuki KITAMURA ] GO-I-01 GO-I-02 Recent Progress on Te Based Glasses Jacques LUCAS, Catherine BOUSSARD-PLéDEL, Bruno BUREAU (Glass and Ceramic Group, University of Rennes) Research on the Novel Far-infrared Tellurium-based Chalcogenide Glasses Shixun DAI, Guoxiang WANG, Xunsi WANG, Xiang SHEN, Changgui LIN, Qiuhua NIE, Tiefeng XU (Faculty of Information Science and Engineering, Ningbo University) GO-O-01 Mechanical Properties and Structures of MnO-ZnO-B 2 O 3 Glasses Hiroyo SEGAWA, Satoru INOUE (National Institute for Materials Science) 39

3 Quantum Dots-doped Silica Glass Fibers for Advanced Optical Devices Pramod R. Watekar 1, Seongmin Ju 1, Won Taek Han 1,2 1 Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology, Gwangju, South Korea 2 Department of Information and Communications, Gwangju Institute of Science and Technology, Gwangju, South Korea Keywords: Quantum dots, Optical Fibers, Silica Glass Fibers Recently, there has been a significant thrust towards silica glass fiber devices for various applications, including biomedical imaging to sensing [1-4]. Advantages of glass fiber devices over their counterpart electrical and bulk glass devices are their light weight, ease of handling and fabrication, cost effectiveness, possibility of making compact devices and compatibility with the existing silica glass optical fiber network. In this regard, more recently, another class of specialty silica glass fibers has appeared with most promising optical characteristics such as enhanced sensitivity and tunability, etc., which employs incorporation of quantum dots (QDs) in the core of optical fibers, thereby taking advantage of quantum confinement effects [1-2,4]. In the present talk, we review a few of such specialty silica glass fiber devices that were recently developed at the SOFT laboratory of GIST, South Korea [5]. To fabricate various silica glass fibers incorporated with quantum dots, we used the modified chemical vapor deposition (MCVD) technique, in which the core of fiber preforms was doped with Si particles (Fiber-1), CdSe quantum dots (Fiber-2), and PbSe quantum dots (Fiber-3). The transmission electron microscopy photographs taken from the cores of the various preform samples are shown in Fig. 1. Silica glass fibers with total diameter of 125 µm were drawn from these preforms by using a drawing tower. These fibers had the cutoff wavelength, quantum dot size, and absorption peak, respectively at: (Fiber-1) 1160 nm, <= 6 nm, nm; (Fiber-2) 600 nm, <=4 nm, 610 nm; (Fiber-3) 1320 nm, <=4 nm, multiple peaks nm, nm, nm, 1351 nm. (a) (b) (c) Fig. 1. TEM photographs of (a) Si, (b) CdSe and (c) PbSe quantum dots in silica glass preforms. Firstly, the visible to infrared converter was developed by using the Si QDs-doped silica glass fiber, which showed the emission in the band of 800 nm to 1040 nm upon pumping at 633 nm (HeNe gas laser, 10 mw) as shown in Fig. 2(a). This emission in Si nanocrystals occurred through radiative states associated with the nanocrystal-oxide interface [1]. With proper

4 optimization of QDs size and concentration to get good emission, such type of sources can be used as low cost pumping sources to pump rare earth doped optical fibers. Secondly, a highly sensitive silica glass fiber current sensor utilizing the CdSe QDs-doped in the core of the silica glass fiber was developed with a special structure of core refractive index so as to get the bending loss less than 0.5 db/loop at 633 nm and 10 mm of loop diameter. Considering its high Faraday effect and bend insensitivity, the current sensitivity of about 675 μrad/(turn.a.m) was obtained, which was about 16 times larger than the single mode glass fiber current sensor. Lastly, with regards to the PbSe QDs-doped silica glass fiber, the resonant optical nonlinearity was measured to be about m 2 /W at 1500 nm, the response time was measured to be around 175 ps, and with such a fast response time it was possible to develop a nonlinear optical switch by using the combination of the PbSe QDs-doped optical fiber with the long period gratings (LPG) pair written on the PbSe QDs-doped silica glass fiber itself [4]. The periodicity and the length of each grating were fixed at 350 μm and 15 mm, respectively. Detected electrical output at 1500 nm upon pumping at 550 mw (1064 nm, Yb-doped optical fiber laser) is shown in Fig. 2(c), where we utilized the π/2 phase shift in the fringe pattern in the PbSe QDs-doped optical fiber obtained upon pumping with the Yb-doped optical fiber laser, demonstrating ON/OFF switching. Emission (dbm) Faraday rotation (degree) = 633 nm Wavelength (nm) Current (A) (a) (b) (c) Fig. 2. (a) Emission in the Si QDs-doped silica glass fiber upon pumping at 632 nm, (b) Current sensitivity of the CdSe QDs-doped silica glass fiber current sensor, and (c) ON/OFF operation of the PbSe QDs-doped fiber switch. References: [1] P. R. Watekar, S. Ju and W. T. Han, Current Applied Physics, 9 (2009) S182. [2] P. R. Watekar, S. Ju, S. Kim, S. Jeong, Y. Kim and W. T. Han, Optics Express, 18 (2010) [3] C. Davis, V. Hodzic and R. W. Gammon, (2010) (Online) [4] P. R. Watekar, S. Ju, A. Lin, M. J. Kim, B. H. Lee and W. T. Han, Journal of NonCrystalline Solids, (Online doi: /j.jnoncrysol ) (2010). [5] Link: Acknowledgements: This work was partially supported by the GIST Top Brand Project (Photonics 2020) and the Brain Korea-21, Dept. of Human Resource Development, South Korea.

5 Invited Speakers Bio-materials (BM) Prof. Akiyoshi Osaka (Okayama University); BM-I-01 Prof. Masakazu Kawashita (Tohoku University); BM-I-02 Dr. Hui-suk Yun (Korea Institute of Materials Science); BM-I-03 Prof. Sukyoung Kim (Yeungnam University); BM-I-06 Prof. Jin-Ho Choy (Ewha Womans University); BM-I-05 Computational Ceramic Science and Engineering (CM) Dr. Hiroki Moriwake (Japan Fine Ceramics Center); CM-I-01 Dr. Yong-Sung Kim (Korea Research Institute of Standards and Science); CM-I-02 Dr. Shin'ichi Higai (Murata Manufacturing Co., Ltd.); CM-I-03 Prof. Kisuk Kang (Korea Advanced Institute of Science and Technology); CM-I-04 Electronic Ceramics (EC) Dr. Minoru Osada (National Institute for Materials Science); EC-I-01 Dr. Il-Doo Kim (Korea Institute of Science and Technology); EC-I-02 Dr. Woo sung Lee (Korea Electronic Technology Institute); EC-I-03 Prof. Satoshi Wada (University of Yamanashi); EC-I-06 Prof. Sahn Nahm (Korea University); EC-I-05 Energy and Ecological Materials (EE) Dr. Shinobu Hashimoto (Nagoya Institute of Technology); EE-I-01 Prof. Jong-In Han (Korea Advanced Institute of Science and Technology); EE-I-02 Prof. Tohru Sekino (Tohoku University); EE-I-03 Glass and Opto-materials (GO) Prof. Jacques Lucas (University of Rennes); GO-I-01 Prof. Shixun Dai (Ningbo University); GO-I-02 Dr. Pramod R. Watekar (Gwangju Institute of Science and Technology); GO-I-03 Dr. Naoyuki Kitamura (National Institute of Advanced Industrial Science and Technology); GO-I-04 Nano-materials (NM) Dr. Sakae Tanemura (Japan Fine Ceramics Center); NM-I-02 Raw Materials & Powder Synthesis (RP) Dr. Keijiro Hiraga (National Institute for Materials Science); RP-I-01 Dr. Soo-Hyung Seo (Independent Researcher); RP-I-02 Structural Ceramics (SC) Prof. Young-Wook Kim (University of Seoul); SC-I-01 Prof. Shinobu Hashimoto (Nagoya Institute of Technology); SC-I-02 Dr. Tatsuki Ohji (National Institute of Advanced Industrial Science & Technology); SC-I-03 Dr. Hai-Doo Kim (Korea Institute of Materials Science); SC-I-04 Traditional Ceramics (TC) Prof. Kyu-Ri Pyon (Myongji University); TC-I-01 Thin Films and Processing (TF) Prof. Soon-Gil Yoon (Chungnam National University); TF-I-01 Dr. Tatsuo Kimura (National Institute of Advanced Industrial Science and Technology); TF-I-02 Prof. Tomoaki Yamada (Tokyo Institute of Technology); TF-I-03 Prof. Sang Im Yoo (Seoul National University); TF-I-04 Dr. Hajime Haneda (National Institute for Materials Science); TF-I-05 58