1. Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720, USA
2. Department of Mechanical and Control Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 804-8550, Japan
3. Attolight AG, 1015 Lausanne, Switzerland
4. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, USA
5. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA