HOME > Profile > VILLORA, Garcia
- Address
- 305-0044 1-1 Namiki Tsukuba Ibaraki JAPAN [Access]
Research
- Keywords
bulk single crystals,epitaxy, optoelectronic devices
PublicationsNIMS affiliated publications since 2004.
Research papers
- Mukhtar Hussain, André Mesquita Antunes, Gonçalo Vaz, Joana Alves, Hugo Pires, Tayyab Imran, Marco Peres, Katharina Lorenz, Encarnación Víllora, Kiyoshi Shimamura, Saibabu Madas, Mousumi Upadhyay Kahaly, Subhendu Kahaly, Gonçalo Figueira, Marta Fajardo, Gareth Williams. Anisotropic below bandgap harmonic generation in β-gallium oxide. Optics Express. 32 [26] (2024) 47296-47305 10.1364/oe.525696 Open Access
- Peng Liu, Dongsheng Yuan, Chao Dong, Gaoting Lin, Encarnación G. Víllora, Ji Qi, Xinguo Zhao, Kiyoshi Shimamura, Jie Ma, Junfeng Wang, Zhidong Zhang, Bing Li. Ultralow-field magnetocaloric materials for compact magnetic refrigeration. NPG Asia Materials. 15 [1] (2023) 41 10.1038/s41427-023-00488-7 Open Access
- Théodore Remark, Patricia Segonds, Jérôme Debray, David Jegouso, Encarnación G. Víllora, Kiyoshi Shimamura, Benoît Boulanger. Linear and nonlinear optical properties of the langasite crystal Ca3TaAl3Si2O14. Optical Materials Express. 13 [7] (2023) 2053 10.1364/ome.496056 Open Access
Books
- Richard Dronskowski, Shinichi Kikkawa, Andreas Stein. Handbook of Solid State Chemistry. Handbook of Solid State Chemistry (Wiley). Wiley-VCH Verlag GmbH & Co. KGaA, 2017, 429-466. 10.1002/9783527691036
- 島村 清史, ビジョラ ガルシア, 猪股 大介, 飯塚 和幸. 高輝度白色照明用の単結晶蛍光体. 次世代蛍光体材料の開発. , 2016, 133-141.
- 島村 清史, ビジョラ ガルシア. 光学結晶とバンドギャップ. バンドギャップエンジニアリング－次世代高効率デバイスへの挑戦－. , 2011, 168-177.
Proceedings
- VILLORA, Garcia. Single-crystal phosphors for high-brightness lighting. SPIE News Room ホームページでのビデオ掲載. (2016) 99999
- Encarnación G. Víllora, Stelian Arjoca, Daisuke Inomata, Kiyoshi Shimamura. Single Crystal phosphors for high-brightness white LEDs/LDs. Proc. of SPIE . (2016) 10.1117/12.2212233
- Encarnación G. Víllora, Stelian Arjoca, Kiyoshi Shimamura, Daisuke Inomata, Kazuo Aoki. β-Ga2O3 and single-crystal phosphors for high-brightness white LEDs & LDs,and β-Ga2O3 potential for next generation of power devices. Proc. of SPIE, Oxide-based Materials and Devices V. (2014) 10.1117/12.2039305
Presentations
- VILLORA, Garcia. Single Crystal phosphors for high-brightness white LEDs/LDs. SPIE Photonics West2016. 2016 Invited
- VILLORA, Garcia. β-Ga2O3 and single-crystal phosphors for high-brightness white LEDs & LDs,and β-Ga2O3 potential for next generation of power devices. SPIE Photonics West. 2014 Invited
- ZHOU, Yueshen, YUAN, Dongsheng, VILLORA, Garcia, Nakauchi Daisuke, Kato Takumi, Kawaguchi Noriaki, Yanagida Takayuki, SHIMAMURA, Kiyoshi. High Performance Y1-xTbxTaO4 Single-Crystal Scintillators for X-ray Detection. The 72nd JSAP Spring Meeting 2025 (Japan Society of Applied Physics). 2025
Misc
- 島村 清史, ビジョラ ガルシア, 船木 秋晴. レーザー加工機用の優れたファラデー回転子の開発と実用化. SAT Science Academy of Tsukuba. (2020) 5
- 島村 清史, ビジョラ ガルシア, 猪股 大介, 伊藤 彰, 船木 秋晴. レーザー加工機用ファラデー回転子と高輝度白色光源用単結晶蛍光体の開発. RARE EARTHS. (2018) 25-30
- 島村 清史, ビジョラ ガルシア. 新しい光学単結晶材料の開発を目指して. 光技術コンタクト. (2021) 38-43
Published patent applications
Society memberships
日本結晶成長学会, 応用物理学会
Research Center for Electronic and Optical Materials
Crystals for optical isolators & high-brightness white light sources
UV-VIS-IR Faraday rotators, Single-crystal phosphors
Overview
• Optical isolators are needed for laser machinery, marking, and high-power LDs. New novel Faraday rotators are demanded for higher laser powers and shorter wavelengths.
• Ceramic powder phosphors are used for white lighting by excitation with blue LEDs/LDs. All-inorganic efficient phosphors are needed for high-brightness applications.
Novelty and originality
• Improvement of Tb-garnets for IR Faraday rotators and development of new UV-visible Faraday rotators.
• Development of new binder-free yellow-green single-crystal phosphors with high conversion efficiency and high thermal stability to realize high-brightness white LEDs/LDs.
Details
• High optical quality fluoride and oxide single-crystals are grown by the Czochralski and Bridgman techniques.
• Grown crystals and oriented, cut, and polished for characterization in terms of crystalline quality and optical properties.
• Prototypes are fabricated to analyze the performance of actual devices and to get feedback for further development.
Summary
• Tb-Sc-garnets are already incorporated into Yb-amplified fiber-lasers by Fujikura Ltd.
• CeF3 is implemented in commercial UV-VIS optical isolators.
• SCPs are already utilized in high-brightness light sources, and further expansion is foreseen in the next generations of projectors and headlights.
