Presentations -

Proposal of Zero-Birefringence Polymer by Hybrid Inorganic Crystal

KOIKE YASUHIRO, TAGAYA AKIHIRO

11th IUPAC, International Symposium on Macromolecule- Metal Complexes (MMC-11) (Pisa, Italy) , 

2005.09

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Oral presentation (invited, special)

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無機結晶を添加したハイブリッドポリマーにより、ゼロ複屈折性光学ポリマーを実現する方法を提案し、実証した。針状の結晶を用いることで、ポリマー分子の約１２倍高効率に結晶を配向させることができることを示した。

ブロードバンド技術を支えるフォトニクスポリマーの展開

KOIKE YASUHIRO

（財）化学技術戦略推進機構（ＪＣＩＩ）第2回交流推進委員会　講演会、 (冨山房ビル２階会議室、東京) , 

2005.09

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Oral presentation (invited, special), （財）化学技術戦略推進機構（ＪＣＩＩ）

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これまで当研究室にて研究開発してきたフォトニクスポリマーについて解説し、これらの現状と今後の展開について述べた。

プラスチック光ファイバーの現状と展望

KOIKE YASUHIRO

平成１７年度第３６回繊維学会夏季セミナー (湯沢ニューオータニホテル、新潟) , 

2005.09

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Oral presentation (invited, special), 社団法人　繊維学会

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ハードのブロードバンド化を達成しうる通信メディアとして近年注目されているPOFについて現状と展望を解説した。

Recent POF Technology for Broadband Society

KOIKE YASUHIRO

Electrical and Related Properties of Organic Solids and Polymers, (ERPOS 2005) (Cargèse, France) , 

2005.07

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Oral presentation (invited, special), International Union of Pure and Applied Chemistry

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In the field of LANs, transmission system based on a multimode silica fiber network is heading towards capacities of Gb/s. We have proposed a low-loss, high-bandwidth, and large-core graded-index plastic optical fiber (GI POF) in data-com. area. A serious problem of "modal noise" that exhibits in medium core of "multi-mode fiber" can be virtually eliminated by GI POF. Furthermore, advent of perfluorinated (PF) polymer based GI POF network can support high transmission than even silica fibers network because of the small material dispersion of PF polymer rather than silica material. The gigabit technology which we propose will bring us back to “Face-to-Face Communication.”

Status of High-Speed Plastic Optical Fiber for Broadband Society

KOIKE YASUHIRO

The 10th OptoElectronics and Communication Conference (OECC 2005) (COEX Convention Center, Seoul, Korea) , 

2005.07

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Oral presentation (invited, special)

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The concept of “Fiber to the Display” is reviewed, where the Graded-Index Plastic Optical Fiber (GI-POF) is connected to the display. The extrusion process of fabricating the GI-POF is proposed for the first time.

Status of Intelligent Photonics Polymers in Fiber-to-the-Display

KOIKE YASUHIRO

The 6th International Conference on Intelligent Materials and Systems, (ICIM’05), June, 2005 (Arcadia Ichigaya, Tokyo, Japan) , 

2005.07

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Oral presentation (invited, special), Intelliganet Materials and Systems Forum, The SOciety of Non-Traditional Technology, Japan Science and Technology Agency

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The photonics polymers for broadband society were reviewed, and a novel concept of “Fiber to the Display” was proposed. With changing the size of heterogeneities in refractive index, fundamentals of optical functions were tightly controlled. With this concept, we propose the GI-POF, which realized 12Gbps data transmission for 100m, the highly scattered optical transmission (HSOT) polymer for much brighter LCD backlight than that of conventional transparent one, and the zero-birefringent polymer for LCD films and optical devices such as pick-up lens and disc etc. Based on these above photonics polymers, the concept of “Fiber to the Display” can be achieved with an extremely low cost system, where the GI-POF is directly connected to the large-sized and high-quality flat panel display. This concept, we believe, will bring us back to “Face-to-Face communication”.

Photonics Polymers for Realizing Broadband Society

KOIKE YASUHIRO

第16回プラスチック成型加工学会年次大会2005年6月、(基調講演) (タワーホール船堀、東京) , 

2005.06

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Oral presentation (invited, special)

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With the recent practical application of polymer optical fibers, the conventional assumption that polymers are less suitable as optical materials than inorganic glass is beginning to be break down gradually. Also, emergence of GI-POF suggests that polymers can be optical materials with properties that are not inferior to, and in some situation, might be superior to that of inorganic glass. The next generation photonics polymers requires such function as long distance transmission, less distorted transmission of ultra high-speed signals, more accurate control of polarized waves, more concentration, and more amplification. However, it has been thought that polymers cannot fully meet these requirements due to their inherent properties caused by complex systems of an aggregation of huge macro molecular chain. Is it really true? We analyze morecular structures of polymers as well as higher structures to conformation and configuration of polymer chains and try to create each of those required functions based on the fundamentals of “photonics polymer.”

Fundamentals of Photonics Polymers for The Broadband Society

KOIKE YASUHIRO, TAGAYA AKIHIRO

平成17年度繊維学会年次大会、第19回オプティックスとエレクトロニクス有機材料に関するシンポジウム (長良川国際会議場、岐阜市) , 

2005.06

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Oral presentation (invited, special), 社団法人　繊維学会

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高分子物質と光学の学問領域の壁を取り払い、光の偏波またはフォトンが、様々な高分子の鎖やその集合体、高次構造、さらに巨大な不均一構造とどのような関わりを有するかを、その起源までさかのぼって検討した結果を紹介する。そしてそれらの基礎研究を基に、これまでの研究成果の中から、代表的なものについて解説し、今まで無機ガラスの独壇場であった光通信などのフォトニクス分野における、新しい光機能をもったフォトニクスポリマーの現状について展望する。

POFの研究・開発・商品化に関する最近の国際的動向

KOIKE YASUHIRO

第52回POFコンソーシアム全体会議 (東京) , 

2005.05

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Oral presentation (invited, special)

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フォトニクスポリマーと呼ばれる分野と、快適なネットワーク環境とのかかわりに関する最近の動向について詳しく解説した。

Status of Photonics Polymer in Broadband Society

KOIKE YASUHIRO

8th International Conference on Frontiers of Polymers and Advanced Materials (ICFPAM) (Cancun, Mexico) , 

2005.04

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Oral presentation (invited, special), Institution de Investigaciones en Materiales, and Institution de Ciencias Nuclears Universidad Nacional Autonoma de Mexico and Cea-Drt/Litten, France

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The concept of “Fiber to the Display” is reviewed, where the Graded-Index Plastic Optical Fiber (GI-POF) is connected to the display.

Novel Photonics Polymers for High-Speed and High-Quality Real-Time Communication

KOIKE YASUHIRO

2005' International Symposium on Glass in Connection with the Annual Meeting of the International Commission on Glass,　(ISG/ICG 2005 (Shanghai International Convention Center, Shanghai, China) , 

2005.04

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Oral presentation (invited, special), Chinese Ceramic Society

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Novel photonics polymers are described, focusing on the high-speed GI-POF (Graded-Index Plastic Optical Fiber), the high-quality photonics polymer films for LCD, and the novel 100-inch sized projection screen. Based on these photonics polymer devices, the concept of "Fiber to the Display" is proposed.

Photonics Polymers for High-Speed Optical Data Transmission and High-Quality Displays

KOIKE YASUHIRO

社団法人日本化学会第８５春季年会(2005) (神奈川大学横浜キャンパス、神奈川県横浜市) , 

2005.03

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Oral presentation (invited, special), 社団法人日本化学会

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高分子物質学と光学には隔たりがあり、本質的な議論が十分になされないまま、光学ポリマーが評価され、それが常識化されてきたように思われる。我々は高分子と光の相互作用をその起源までさかのぼって検討し、新しい光機能をもったフォトニクスポリマーの提案してきた。

Mechanism of refractive index profile for plastic materials and application of broad band plastic optical fiber

ISHIGURE TAKAAKI, KONDO ATSUSHI, KOIKE YASUHIRO

社団法人日本レオロジー学会 高分子加工技術研究会、第５７回例会 (工学院大学新宿校舎、東京) , 

2005.03

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Oral presentation (invited, special), 社団法人日本レオロジー学会 高分子加工技術研究会

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これまで光学材料としてのプラスチックは、無機光学材料に比較して、低価格であるものの性能は劣ると思われてきた。しかしながら近年の材料開発により、無機材料の性能を凌駕しうるプラスチック材料が開発され、実際に光ファイバとしての用途展開がなされている。本稿ではプラスチック材料内に屈折率の分布を形成させることにより実現する、超高速GI型プラスチック光ファイバの開発過程とその特性並びに応用展開について講演する。

High-Speed and High-Quality Photonics Polymer Devices for Broadband Society

KOIKE YASUHIRO

International Conference on Organic Photonics and Electronics 2005 & The 8th International Conference on Organic Nonliniear Optics, (ICPOE 2005 & ICONO’8) (Matsushima, Japan) , 

2005.03

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Oral presentation (invited, special)

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Novel photonics polymers are described, focusing on the high-speed GI-POF (Graded-Index Plastic Optical Fiber), the high-quality photonics polymer films for LCD, and the novel 100-inch sized projection screen. Based on these photonics polymer devices, the concept of "Fiber to the Display" is proposed, where the GI-POF is directly distributed to the display from main server in building or house. Therefore, the real-time face-to-face communication with HDTV quality becomes possible, that can not be achieved by current technologies. We believe that new innovative concepts of broadband society in 21st century will be realized by "the proposal from the material side".

情報通信分野におけるフォトニクスポリマーの役割

KOIKE YASUHIRO

社団法人高分子学会東海支部「東海シンポジウム」 (名古屋国際会議場、名古屋) , 

2005.01

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Oral presentation (invited, special), 社団法人高分子学会東海支部

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光の偏波またはフォトンが様々な高分子鎖やその集合体、高次構造、更に巨大な不均一構造とどのようなかかわりを持つかを解析することにより、従来の光学材料に比べてより付加価値の高い「フォトニクスポリマー」を設計する事が可能となった。このフォトニクスポリマーと呼ばれる分野と、快適なネットワーク環境とのかかわりに関する最近の動向について詳しく解説した。

ITのためのフォトニクスポリマー

KOIKE YASUHIRO, TAGAYA AKIHIRO

Photonics Polymers for Information Technology (東京工業大学百年記念館フェライト会議室（東京）) , 

2004.12

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Oral presentation (invited, special), 社団法人高分子学会、プラスチックフィルム研究会

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ITの発展とともに、高画質な画像を利用したいという要求は年々高まっている。いくつかの種類のディスプレイが提案、実用化している中でも、LCDは非常に優れたディスプレイであり、今後も広く使われると思われる。LCDを支えるフォトニクスポリマーについて紹介する。

Train Communication System using Graded-Index Leaky Plastic Optical Fiber

SHIMURA AKIHIRO, YASUO SUGAWARA, HARUYAMA SHINICHIRO, NAKAGAWA MASAO, HIROMASA SUZUKI, KONNDOU ATSUSHI, ISHIGURE TAKAAKI, KOIKE YASUHIRO

2004 IEEE International Conference on Industrial Technology, (IEEE ICIT 2004) (Tunisia) , 

2004.12

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Oral presentation (invited, special), IEEE

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We propose a new communication system using optical wireless communication. In the proposed system, GI leaky POF is used as the communication medium. Since this fiber has the structure where scatterers are mixed in the core of normal GI POF, the light which is entered through the end of this fiber from LD can be leaked along the fiber. This GI Leaky POF and photo detector are installed in train and the ground, and the light which leaks from this fiber is received continuously by a photo detector. From the measurement results, we confirmed that new GI Leaky POF has the broadband and low delay characteristics. The experimental result show that this new train communication method using a leaky optical fiber is a very promising technology for the future high-speed data communication between trains and a ground.

Nano Crystal-Doped Zero-Birefringence Optical Polymers for Liquid Crystal Displays

TAGAYA AKIHIRO, OHKITA HISANORI, KOIKE YASUHIRO

The 11th International Display Workshops, (IDW’04) (Niigata, Japan) , 

2004.12

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Oral presentation (invited, special)

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The compensation of orientational birefringence of a polymer was demonstrated by a novel method, the birefringent crystal dopant method. Orientational birefringence of poly (MMA-co-BzMA) film was compensated by doping with 0.3wt% of the SrCO3 crystal with a length of 200nm and a width of 20nm in the range of incident angle from 0° to 45° at 633nm wavelength. The Polarization state of transmitted light was almost maintained through the copolymer film.

Novel Photonics polymer for Broadband IT

KOIKE YASUHIRO,ISHIGURE TAKAAKI

2004 IEEE International Conference on Industrial Technology, (IEEE ICIT 2004) (Tunisia) , 

2004.12

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Oral presentation (invited, special), IEEE

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New properties and potential applications of Photonics Polymer are explained along with the basic studies on the relationship between photon lights and various polymer chains which create new properties. As results, we have come to original discoveries such as Graded Index Plastic Optical Fiber with longer-distance transmission, less distorted transmission of ultra high-speed signals, more accurate control of polarized waves, more concentration, and more amplification.

High-Bandwidth Plastic Optical Fiber with W-Refractive Index Profile

ISHIGURE TAKAAKI, ENDO HIDEKI, OHDOKO KUNIHIRO, KOIKE YASUHIRO

2004 IEEE International Conference on Industrial Technology, (IEEE ICIT 2004) (Tunisia) , 

2004.12

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Oral presentation (invited, special), IEEE

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A plastic optical fiber having a W-shaped refractive index profile (W-shaped POF) was prepared for the first time to realize a higher bit rate transmission than those of the conventional silica –based multimode fiver (MMF) and graded-index (GI) POFlinks. Since the W-shaped POF has a valley of the refractive index at the boundary of the core and cladding of the conventional GI POF, the group delay of the higher order modes is strongly influenced, thus, compensating the modal dispersion that exists in the GI POF. The modal dispersion compensation effect by the W-shaped index profile was theoretically and experimentally confirmed.