Azulenic Pigments for Near IR Detection and Nonlinear Optical Studies
Abstract
New azulene-containing chromophores were synthesized and their nonlinear optical and excited state properties determined in collaboration with Natick ARO and academic researchers. DFWM and two-dimensional Z-scan measurements revealed that an azulenic polymethine dye, a new class of NLO chromophore, was an effective optical power limiter. A series of azulenic polymethine dyes were prepared and their third-order NLO activity and optical power limiting thresholds determined. Third-order susceptibilities were enhanced by increasing conjugation length and side-chain alkylation. First hyperpolarizabilities were determined by the Hyper-Raleigh Scattering method at 1064 and 1907 nm for several new azulenic chromophores. New polymers containing azulenic NLO chromophores were prepared for the first time. Dramatic enhancement of azulene fluorescence was realized by manipulation of excited state energy gaps by molecular engineering. Theoretical calculations provided structural guidelines for the preparation of new azulenic NLO chromophores.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 17, 1999
- Accession Number
- ADA379071
Entities
People
- Alfred E. Asato
- Robert S. Liu
Organizations
- University of Hawaiʻi System