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-->   Hiroaki Yoshioka Last modified date：2024.04.25 Associate Professor / Department of Electronics Faculty of Information Science and Electrical Engineering 1 Research Interests 2 Academic Activities 2.1 Papers 2.2 Presentations 3 Membership in Academic Society E-Mail　*Since the e-mail address is not displayed in Internet Explorer, please use another web browser:Google Chrome, safari. Homepage https://kyushu-u.elsevierpure.com/en/persons/hiroaki-yoshioka　Reseacher Profiling Tool　Kyushu University Pure https://laserlab.ed.kyushu-u.ac.jp/Oki laboratory website . https://en.hiroaki-yoshioka.netPersonal website - Hiroaki YOSHIOKA .net . Academic Degree Dr. Eng. Country of degree conferring institution (Overseas) No Field of Specialization Laser engineering Total Priod of education and research career in the foreign country 02years02months Research Research Interests Research on the development and application of printable optical microcavitieskeyword : Waveguides, Organic materials, Dye lasers, Inkjet techniqu2013.04. Degradationrecoverable solid-state DFB polymer laserkeyword : Waveguides, Organic materials, Dye lasers, Nanoporous2010.04～2013.03. Diode-pumped mode-locked Yb:YAG ceramic laserkeyword : Mode-locked lasers, Rare earth and transition metal solid-state lasers2007.04～2010.03. Academic Activities Papers  Show All Papers >> 1. Nasim Obata, Yuya Mikami, Hiroaki Yoshioka, Yuji Oki, Embedding Optical Microcavities in Nanoporous SiO2 Film via Infill Inkjet Printing, Advanced Photonics Research, 10.1002/adpr.202200018, 2200018, 2022.05, ナノシリカ粒子を堆積させたナノポーラスフィルムに有機ポリマー溶液を浸透させマイクロ光学構造を実装するインフィル印刷法に関する研究である。. 2. Yuya Mikami, Hiroaki Yoshioka, Nasim Obata, Sangmin Han, and Yuji Oki, Polarization-dependent refractive index analysis for nanoporous microcavities by ray tracing of a propagating electromagnetic field, Optical Materials Express, 10.1364/OME.434394, 11, 9, 2924-2937, 2021.08, 有機無機ハイブリッド材料における基礎的な屈折率のふるまいを明らかにするために、ナノシリカ粒子凝集体を用いてFDTD法によりs、p偏光それぞれにおける斜入射光のふるまいを詳細に解析した。その結果、s、p偏光それぞれで遮蔽効果を受ける割合が異なることが分かり、偏光状態で実効的な屈折率が異なることを明らかにした。また、実際にナノシリカ粒子凝集体を用いた印刷マイクロディスクのＷＧＭレーザー発振も行った。. 3. Abdul Nasir, Yuya Mikami, Rui Yatabe, Hiroaki Yoshioka, Nilesh Vasa, and Yuji Oki, Fully room temperature and label free biosensing based on an ink-jet printed polymer microdisk laser, OPTICAL MATERIALS EXPRESS, 10.1364/OME.415000, 11, 3, 592-602, 2021.03, Materials with biomolecule-compatible functional groups are desirable for the fabrication of microdisk lasers used in bio-sensing applications. In this study, a microdisk laser was fabricated using a low-viscosity hyper branched polymer FC-V-50 using ink-jet printing, and was surface-modified at room temperature within a relatively short time compared to conventional methods. The carboxyl functional group of the FC-V-50 polymer was used for surface modification and biotinylation. The adsorption characteristics of the microdisk laser were evaluated using bovine serum albumin, avidin, and streptavidin. This study reports the first demonstration of label-free biosensing using the FC-V-50 polymer-based microdisk laser.. 4. Hiroaki Yoshioka, Shintaro Mitsui, Yuji Oki, Lasing from Printable Organic-Inorganic Microdisk Cavity with Mixed Doping of Laser Dye and ZnO, 2018 European Conference on Optical Communication, ECOC 2018 2018 European Conference on Optical Communication, ECOC 2018, 10.1109/ECOC.2018.8535487, 2018.11, We have experimentally demonstrated a fabrication and WGM lasing of organic-inorganic microdisk mixed with laser dye and ZnO by the ink-jet printing without co-doping binding polymer for cavity host. This is the first demonstration of binder-free organic-inorganic hybrid microdisk lasers.. 5. Abdul Nasir, Cong Chen, Yuya Mikami, Hiroaki Yoshioka, Naoya Nishimura, Nilesh Vasa, and Yuji Oki, Lasing characteristics of pyrromethene597 doped fluorinated hyper branched polymer based microdisk laser fabricated by ink-jet printing method, 23rd Microoptics Conference, MOC2018, 2018.10. 6. Taku Takagishi, Hiroaki Yoshioka, Shintaro Mitsui, Yuya Mikami, Naoya Nishimura, Yuji Oki, Highly Transparent Organic Microdisk Cavity in Visible Range by the Ink-jet Printing Method, 2018 Conference on Lasers and Electro-Optics, CLEO 2018 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings, 2018.08, We experimentally demonstrated the fabrication and the fundamental lasing evaluation of a printed microdisk cavity by focusing on a fluorinated spherical polymer FZ-001 to achieve a microdisk with small absorption loss in the visible range.. 7. Yuya Mikami, Hiroaki Yoshioka, Soichiro Ryu, Naoya Nishimura, Yuji Oki, Organic-inorganic hybrid microdisk laser with dye and silica mixed doping prepared by ink-jet printing method, Optics Express, 10.1364/OE.26.007140, 26, 6, 7140-7147, 2018.03, We developed an ink-jet printing method for fabricating inorganic microdisks at room temperature, which is much lower than the melting point of solid-state inorganic oxide, and have fabricated an organic-inorganic hybrid microdisk laser. Silica was used as the inorganic disk material, and microdisk-shaped aggregates were formed by the ink-jet printing method using a solution in which nanosilica particles were dispersed in propylene glycol monomethylether (PGME) solvent. Then, a microdisk capable of laser oscillation was also prepared by preliminarily adding the laser dye rhodamine 6G to the ink to form a mixed organic material. The structural evaluation of the printed microdisk was first conducted using an optical microscope, a scanning electron microscope (SEM), and an atomic force microscope (AFM). The results of laser oscillation evaluation by optical excitation showed that the printed microdisk sufficiently functions as an optical resonator with a low optical loss. In these evaluations, excellent values such as a surface roughness of 5.83 nm from root mean square (R. M. S.) which is one forth smaller than the particle diameter, and a laser oscillation threshold of 4.76 μJ/mm2 at a wavelength of 601.4 nm were obtained. To the best of our knowledge, this is the first time that an inorganic microdisk has been fabricated at room temperature to realize an organic-inorganic hybrid microdisk laser.. 8. Hiroaki Yoshioka, Yuya Mikami, Soichiro Ryu, Shintaro Mitsui, Cong Chen, Naoya Nishimura, Yuji Oki, Silica-based Inorganic Microdisk Cavity by the Ink-jet Printing Method, CLEO: 2017, 2017.05. 9. Hiroaki Yoshioka, Controlling mobility speed of dye molecules in polydimethylsiloxane through molecular weight and solubility, OPTICAL MATERIALS EXPRESS, 10.1364/OME.6.003417, 6, 11, 3417-3426, 2016.11. 10. Hiroaki Yoshioka, Cong Chen, Soichiro Ryu, Jifeng Li, Masaaki Ozawa, Yuji Oki, Ultra-low Threshold Lasing at 0.8 μm from Organic Microdisk Cavity by the Ink-jet Printing Method, CLEO: 2016, 2016.06. 11. Hiroaki Yoshioka, Noboru Hirakawa, Mitsuhiro Nakano, Yuji Oki, On-Demand Fabrication of Micro-Wired Rods and Nano-Coupling Control for 3D Polymeric Optical System, CLEO: 2015, 2015.05. 12. Hiroaki Yoshioka, Tomoya Ota, Cong Chen, Soichiro Ryu, Kei Yasui, Yuji Oki, Extreme ultra-low lasing threshold of full-polymeric fundamental microdisk printed with room-temperature atmospheric ink-jet technique, SCIENTIFIC REPORTS, 10.1038/srep10623, 5, 2015.05, 円盤型レーザー素子は、髪の毛の太さ程度の円盤形状をした光を閉じ込め共振させる微小共振器（マイクロディスクキャビティー）から構成され、情報処理分野における集積光回路に実装可能な周波数コム発生素子、医療バイオ分野におけるウイルス１個程度を検出できる超高感度バイオセンサーなど多岐にわたる分野で応用が可能なことから近年大きな注目を集めている。しかしこの円盤型レーザー素子の作製には、従来、フォトリソグラフィー法といった半導体プロセスの高度な技術が用いられてきたため、工場・実験室レベルで扱うものという考えが当該研究分野では常識であった。そこで本研究ではインクジェット技術を利用した室温・大気圧下で作製できる全く新しい分散型産業を指向した「インクジェットレーザー印刷法」を確立した。これは、超省エネルギーの円盤型レーザー素子を必要な場所に必要な数だけ市販のインクジェットプリンターのように簡単に卓上印刷できるという極めて独創的な技術である。当該学術分野のデバイス作製難易度を大きく低下させる「作製プロセスの簡素化」に大きく貢献したことは言うまでもなく、特に簡素な手法でありながら作製されたレーザー素子は駆動に必要なエネルギー（レーザー発振しきい値）において世界記録（従来より22%低いエネルギー）の「超省エネルギー化」を達成したことは学術的貢献が極めて高い。. 13. Hiroaki Yoshioka, Yusuke Itoh, Ayumu Kiyomori, Yuji Oki, Degradation self-recovery and durability extension on solid-state dye laser in blue region, CLEO: 2013, OSA Technical Diges, 10.1364/CLEO_SI.2013.CF1I.5, 2013.05. 14. Hiroaki Yoshioka, Yusuke Itoh, Ayumu Kiyomori, Masanao Era, Yuji Oki, Fluorene-based chromophore for degradation-recoverable solid-state dye laser, OPTICAL MATERIALS EXPRESS, 3, 2, 176-183, 2013.01. 15. Hiroaki Yoshioka, Wataru Iwasaki, Yukihiro Yamashita, Nobuo Miyadera, Kei Yasui, Daisuke Maeda, Yuji Oki, Nd3+-TFA:HPDA Polymeric Microchip Laser, 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2012.05. 16. Hiroaki Yoshioka, Yu Yang, Hirofumi Watanabe, Yuji Oki, Fundamental characteristics of degradation-recoverable solid-state DFB polymer laser, OPTICS EXPRESS, 20, 4, 4690-4696, 2012.02. 17. Hiroaki Yoshioka, Wang Weibo, Kota Kuwamitsu, Wataru Iwasaki, Yukihiko Yamashita, Noboru Miyadera, Yuji Oki, Laser Action of Nd-Complex-Doped Polymer Laser Based on Liquid, MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 10.1080/15421406.2011.566444, 539, 225-230, 2011.05. 18. Hiroaki Yoshioka, Ryo Goto, Soichiro Omi, Yu Yang, Yuji Oki, Degradation Recoverable DFB Lasers Based on P597:PDMS/PTFEMA, The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2011 paper:, 2011.05. 19. Hiroaki Yoshioka, Ryo Goto, Soichiro Omi, Yu Yang, Yuji Oki, Solid-State Polymer Waveguide DFB Laser with Self Dye-Circulatory Function, 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2011.05. 20. Hiroaki Yoshioka, Wang Weibo, Kota Kuwamitsu, Wataru Iwasaki, Yukihiko Yamashita, Nobuo Miyadera, Yuji Oki, High Efficient Laser Action by Nd3+ Complex, 2011 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2011.05. 21. Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Dual-wavelength mode-locked Yb:YAG ceramic laser in single cavity, 2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS), 2010.05. 22. Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Dual-wavelength mode-locked Yb:YAG ceramic laser in single cavity, OPTICS EXPRESS, 18, 2, 1479-1486, 2010.01. 23. Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, 233-fs mode-locked Yb:YAG ceramic laser, 2009 LASERS & ELECTRO-OPTICS & THE PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1 AND 2, 1248-1249, 2009.09. 24. Shinki Nakamura, Hiroaki Yoshioka, Takayo Ogawa, Satoshi Wada, Broadly Tunable Yb3+-Doped Y3Al5O12 Ceramic Laser at Room Temperature, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.1143/JJAP.48.060205, 48, 6, 2009.06. 25. Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Diode-Pumped Mode-Locked Yb:YAG Ceramic Laser, 2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE (IQEC), 2009.06. 26. Hiroaki Yoshioka, Shinki Nakamura, Takayo Ogawa, Satoshi Wada, Diode-pumped mode-locked Yb:YAG ceramic laser, OPTICS EXPRESS, 17, 11, 8919-8925, 2009.05. 27. Shinki Nakamura, Hiroaki Yoshioka, Yu Matsubara, Takayo Ogawa, Satoshi Wada, Efficient tunable Yb : YAG ceramic laser, OPTICS COMMUNICATIONS, 10.1016/j.optcom.2008.05.009, 281, 17, 4411-4414, 2008.09. 28. Hiroaki Yoshioka, Shinki Nakamura, Yu Matsubara, Takayo Ogawa, Satoshi Wada, Efficient tunable diode-pumped Yb:YAG ceramic laser, 2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9, 2601-2602, 2008.05. Presentations  Show All Presentations >> 1. Hiroaki Yoshioka, Yuya Mikami, Taku Takagishi, Naoya Nishimura, Yuji Oki, Additive fabrication of silica 3D structure for WGM optical micro cavities, 6th Korea-Japan Joint Symposium on Advanced Solar Cells 2019 - 3rd International Symposium on Energy Research and Application, 2019.02. Membership in Academic Society Optical Society of America (OSA) Laser Society of Japan The Japan Society of Applied Physics Unauthorized reprint of the contents of this database is prohibited. Copyright © 2006, Kyushu University. All rights reserved.