1. Department of Mechanical Engineering, Division of Materials Science and Engineering, and the Photonics Center, Boston University, Boston, Massachusetts 02215, United States
2. SUNUM, Nanotechnology Research and Application Center, Sabanci University, Istanbul 34956, Turkey
3. Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul 34956, Turkey
4. Department of Mechanical Engineering, Bilkent University, Ankara 06800, Turkey
5. National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
6. Department of Physics, Gordon College, Wenham, Massachusetts 01984, United States
7. Aramco Services Company, Aramco Research Center−Houston, Houston, Texas 77084, United States