Backward-enhanced fluorescence from clusters of microspheres and particles of tryptophan.
Measured fluorescence from single-particle clusters of dye-doped polystyrene microspheres, dried nonspherical particles of tryptophan, and single polystyrene microspheres is enhanced in the backward direction (180 degrees from the incident laser). This enhancement (a factor of 2-3 compared to 90 degrees), which can be interpreted as a consequence of the reciprocity principle, increases with the particle refractive index.
Pan
Yong-Le
YL
Physical Science Laboratory, New Mexico State University, Las Cruces 88003-8002, USA.
Hill
Steven C
SC
Wolf
Jean-Pierre
JP
Holler
Stephen
S
Chang
Richard K
RK
Bottiger
Jerold R
JR