Three-dimensional two-photon imaging in polymeric materials

Kevin Belfield, Katherine J. Schafer, Stephen Andrasik, Ozlem Yavuz, Eric W. Van Stryland, David J. Hagan, Joel M. Hales

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We report image formation via single and two-photon photoinduced fluorescence changes in a polymeric medium with two-photon fluorescence readout of multiplayer structures. Photoinduced acid generation in the presence of a two-photon fluorescent dye possessing strongly basic functional groups (7-benzothiazolyl-9,9-didecyl-2,2-(N,N-diphenylamino)fluorene underwent protonation upon exposure with UV or near-IR (740 nm fs pulses). Solution studies demonstrate formation of monoprotonated and diprotonated species upon irradiation, each resulting in distinctly different absorption and fluorescence properties. The fluorescence of the original, neutral, fluorophore is quenched upon monoprotonation with a concomitant increase in fluorescence at longer wavelengths due to the monoprotonated form. Hence, two channel two-platon fluorescence imaging provides "positive" or "negative" image readout capability. Results of solution and solid polymer thin films experiments are presented.

Original languageEnglish (US)
Pages (from-to)281-289
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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