* Corresponding authors

^a Rutgers University, Department of Biomedical Engineering, 599 Taylor Road, Piscataway, NJ 08854, U. S. A
E-mail: yves@rutchem.rutgers.edu
Fax: +1 732 445 4991
Tel: +1 732 445 8248

^b Koc University, Department of Physics, Istanbul, Turkey
E-mail: rkortan@ku.edu.tr
Fax: +90 212 338 1547
Tel: +90 212 338 1701

^c Rutgers University, Department of Chemistry and Chemical Biology, 610 Taylor Road, Piscataway, NJ 08854, U. S. A
E-mail: rivillon@physics.rutgers.edu
Fax: +1 732 445 4991
Tel: +1 732 445 7347

^d Johns Hopkins University, Department of Materials Science and Engineering, 3400 North Charles Street, 103 Maryland Hall, Baltimore, MD 21218, U. S. A
E-mail: hekatz@jhu.edu
Fax: +1 410 516 529
Tel: +1 410 516 6141

^e Bell Laboratories, Alcatel-Lucent, 600 Mountain Avenue, Murray Hill, NJ 07974, U. S. A
E-mail: tsi@alcatel-lucent.com
Fax: +1 908 582 3104
Tel: +1 908 582 5253