Fluorescence imaging of single molecules in polymer microspheres.
We report on far-field fluorescence imaging of single molecules in spherical polymer microparticles produced from solution by using microdroplet techniques. The fluorescence photobleaching quantum yields of rhodamine 6G in a common water-soluble polymer (polyvinyl alcohol) are at least five times smaller, corresponding to proportionally larger average fluorescence signals, than those in ethanolic solvents. This allows for acquisition of multiple images from a single molecule on a time scale of several minutes. We also show that fluorescent images of single molecules in microspheres can be calculated from semiclassic electrodynamics, which may ultimately be useful in retrieving dynamical information from experimental images.
Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Tennessee 37831-6142, USA.
M D
MD
Barnes
K C
KC
Ng
K P
KP
McNamara
C Y
CY
Kung
J M
JM
Ramsey
S C
SC
Hill
D005453:Fluorescence; D005456:Fluorescent Dyes; D008856:Microscopy, Fluorescence / Q000379:methods*; D008863:Microspheres; D011108:Polymers; D011142:Polyvinyl Alcohol; D012235:Rhodamines
D005456:Fluorescent Dyes; D011108:Polymers; D012235:Rhodamines; C026188:rhodamine 6G; D011142:Polyvinyl Alcohol