FRET lasing from self-assembled DNA tetrahedral nanostructures suspended in optofluidic droplet resonatorsM. Aas, E. Özelci, A. Jonáš, A. Kiraz, H. Liu, C. Fan, Q. Chen and X. FanEur. Phys. J. Special Topics, 223 10 (2014) 2057-2062DOI: https://doi.org/10.1140/epjst/e2014-02280-1