Investigation of nanolocal fluorescence resonance energy transfer for scanning probe microscopy

Author :G. T. Shubeita, S. K. Sekatskii, M. Chergui, G. Dietler, and V.S. Letokhov
Publication :Applied Physics Letters
Volume :74
Number :23
Pages :3453-3455
Year :1999

Fluorescence resonance energy transfer ~FRET! has been observed between donor dye molecules
deposited onto the sample surface and acceptor dye molecules deposited onto the scanning
near-field optical microscope ~SNOM! or atomic force microscope tip. FRET was observed only
when the tip acquired a contact with the sample and took place in a region of few tens of square
nanometers in size when thousands ~hundreds! of molecules are involved. In view of the obtained
results, the perspectives for the construction of a one-atom FRET SNOM are described.