1. Department of PhysicsKobe University Kobe Japan
2. Graduate School of EngineeringThe University of Hyogo Himeji Japan
3. National Institute for Fusion ScienceNational Institutes of Natural Sciences Gifu Japan
4. Advanced Device LaboratoryRIKEN Saitama Japan
5. Advanced ICT Research InstituteNational Institute of Information and Communications Technology Kobe Japan
6. Graduate Institute of Electro‐Optical EngineeringNational Taiwan University of Science and Technology Taipei Taiwan