title: Backward-enhanced fluorescence from clusters of microspheres and particles of tryptophan.
abstract: 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.
authors.affiliation: Physical Science Laboratory, New Mexico State University, Las Cruces 88003-8002, USA.
authors.forename: Yong-Le
authors.initials: YL
authors.lastname: Pan
authors.forename: Steven C
authors.initials: SC
authors.lastname: Hill
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Wolf
authors.forename: Stephen
authors.initials: S
authors.lastname: Holler
authors.forename: Richard K
authors.initials: RK
authors.lastname: Chang
authors.forename: Jerold R
authors.initials: JR
authors.lastname: Bottiger