1. Materials Research Laboratory (MRL); University of California, Santa Barbara; Santa Barbara CA 93106 USA
2. Materials Department; University of California, Santa Barbara; Santa Barbara CA 93106 USA
3. Department of Chemistry and Biochemistry; University of California, Santa Barbara; Santa Barbara CA 93106 USA
4. Department of Mechanical and Environmental Engineering; University of California, Santa Barbara; Santa Barbara CA 93106 USA
5. Institut für Pharmazie; Freie Universität Berlin; 14195 Berlin Germany
6. Department of Physics; University of California; Santa Barbara CA 93106 USA