Generation of Coherent VUV Vortex beam by Synchrotron Radiation

• Project/Area Number: 26286081
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: Institute for Molecular Science
• Principal Investigator: KATOH Masahiro 分子科学研究所, 極端紫外光研究施設, 教授 (30185871)
• Co-Investigator(Renkei-kenkyūsha): KONOMI Taro 高エネルギー加速器研究機構, 加速器研究施設, 助教 (20634158) ; HOSAKA Masahito 名古屋大学, シンクロトロン光研究センター, 准教授 (60290897) ; YAMAMOTO Naoto 名古屋大学, シンクロトロン光研究センター, 助教 (60377918) ; TAKASHIMA Yoshifumi 名古屋大学, シンクロトロン光研究センター, 教授 (40303664)
• Research Collaborator: FUJIMOTO Masaki ; SASAKI Shigemi ; MIRIAN Najmeh ; MOCHIHASHI Akira
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000); Fiscal Year 2016: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2014: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
• Keywords: 加速器 / 放射光 / 角運動量 / コヒーレンス / 電磁波 / 光渦 / 真空紫外線 / アンジュレータ / 電子ビーム / レーザー / 量子ビーム / 紫外線 / 回折 / コヒーレント / 電子線

Outline of Final Research Achievements

We succeeded in generating an optical vortex beam, which carries the orbital angular momentum from a diffraction-limited high energy electron beam passing through a circular polarization undulator. We have demonstrated that it has a spiral wave-front by interfering two spatially coherent optical vortex beams. We have demonstrated for the first time that a phase singularity exists at the beam center by a double-slit diffraction experiment. As the underlying physics of this phenomenon, we have shown theoretically for the first time that radiation from an electron in circular motion possesses a spiral wave-front and carries orbital angular momentum.

Research Products

• [Journal Article] Limitations in photoionization of helium by an extreme ultraviolet optical vortex (2017)
  • Author(s): T. Kaneyasu, Y. Hikosaka, M. Fujimoto, T. Konomi, M. Katoh, H. Iwayama, E. Shigemasa
  • Journal Title: Physical Review A Volume: 95
  • DOI: 10.1103/physreva.95.023413
  • Peer Reviewed
• [Journal Article] Angular Momentum of Twisted Radiation from an Electron in Spiral Motion. (2017)
  • Author(s): M. Katoh, M. Fujimoto, H. Kawaguchi, K. Tsuchiya, K. Ohmi, T. Kaneyasu, Y. Taira, M. Hosaka, A. Mochihashi, Y. Takashima
  • Journal Title: Physical Review Leters. Volume: 118
  • DOI: 10.1103/physrevlett.118.094801
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 自由電子による光渦の放射 (2017)
  • Author(s): 加藤政博
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学豊中キャンパス（大阪府豊中市）
  • Year and Date: 2017-03-17
• [Presentation] 自由電子による光渦の放射 (2016)
  • Author(s): 加藤政博
  • Organizer: ビーム物理研究会2016
  • Place of Presentation: SPring-8（兵庫県佐用郡佐用町）
  • Year and Date: 2016-11-24
• [Presentation] OBSERVATION OF WAVEFRONT STRUCTURE OF HELICAL UNDULATOR RADIATION (2016)
  • Author(s): M. Fujimoto, M. Katoh, N. S. Mirian, M. Hosaka, A. Mochihashi, Y. Takashima,Y. Taira, S. Sasaki
  • Organizer: International Beam Instrumentation Conference
  • Place of Presentation: Barcelona, Spain
  • Year and Date: 2016-09-11
  • Int'l Joint Research
• [Presentation] 円偏光アンジュレータから発生する光渦の観測 (2016)
  • Author(s): 藤本將輝、加藤政博、ミリアン ナジメ、保坂将人、高嶋圭史、持箸晃、平義隆、佐々木茂美
  • Organizer: 第１３回日本加速器学会年会
  • Place of Presentation: 幕張メッセ国際会議場（千葉県千葉市）
  • Year and Date: 2016-08-08
• [Presentation] EXPERIMENTAL STUDY ON OPTICAL VORTEX FROM A HELICAL UNDULATOR AT UVSOR-III (2016)
  • Author(s): M. Hosaka, K. Miyamoto, S. Sasaki, K. Kuroda, T. Konomi, N. Yamamoto, N. S. Mirian, M. Katoh
  • Organizer: 7th International Particle Accelerator Conference
  • Place of Presentation: BEXCO, Busan, Korea
  • Year and Date: 2016-05-08
  • Int'l Joint Research
• [Presentation] Fresnel and Fraunhofer Diffraction of Optical Vortex Beam from Helical Undulator (2016)
  • Author(s): N. S. Mirian, M. Katoh, M. Hosaka, N. Yamamoto, T. Konomi, K. Kuroda, A. Miyamoto, K. Miyamoto, S. Sasaki
  • Organizer: 第29回日本放射光学会年会
  • Place of Presentation: 柏の葉カンファレンスセンター（千葉県柏市）
  • Year and Date: 2016-01-09
• [Presentation] Recent Developments of UVSOR-III (2015)
  • Author(s): M. Katoh, J. Yamazaki, H. Kenji, M. Hosaka, Y. Takashima, M. Adachi, T. Konomi, N. Yamamoto
  • Organizer: 6th International Particle Accelerator Conference
  • Place of Presentation: Richmond, USA
  • Year and Date: 2015-05-03 – 2015-05-08
• [Presentation] Analysis of Lights' Orbital Angular Momentum from Helical Undulator Harmonics (2015)
  • Author(s): S. Sasaki, A. Miyamoto, M. Hosaka, N. Yamamoto, T. Konomi, M. Katoh
  • Organizer: 6th International Particle Accelerator Conference
  • Place of Presentation: Richmond, USA
  • Year and Date: 2015-05-03
  • Int'l Joint Research
• [Presentation] アンジュレータ高次光が運ぶ光の軌道角運動量 (2015)
  • Author(s): 佐々木茂美、宮本篤、加藤政博、許斐太郎、保坂将人、山本尚人
  • Organizer: 日本物理学会第７０回年次大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] 軌道角運動量を持つ円偏光アンジュレータ高次光干渉実験 (2015)
  • Author(s): 佐々木茂美、宮本篤、加藤政博、許斐太郎、保坂将人、山本尚人、今園孝志、小池雅人
  • Organizer: 第２８回日本放射光学会年会
  • Place of Presentation: 立命館大学草津キャンパス（滋賀県草津市）
  • Year and Date: 2015-01-10 – 2015-01-12
• [Presentation] 円偏光アンジュレータ高次光が運ぶ光の軌道角運動量観測 (2014)
  • Author(s): 佐々木茂美、宮本篤、加藤政博、許斐太郎、保坂将人、山本尚人
  • Organizer: 第１１回日本加速器学会年会
  • Place of Presentation: リンクステーションホール青森（青森県青森市）
  • Year and Date: 2014-08-09 – 2014-08-11