1. Fujitsu Laboratories 10‐1 Morinosato‐Wakamiya Atsugi Kanagawa‐ken 243‐0197 Japan
2. INRS – Énergie Matériaux et Télécommunications 1650 Lionel‐Boulet Varennes Quebec J3 X 1S2 Canada
3. Tokyo Institute of Technology 4259‐J3‐21 Nagatsuta, Midori‐ku Yokohama 226‐8502 Japan
4. Department of Materials Science & Engineering Drexel University Philadelphia PA 19104 USA