UV Curable Epoxy-Based Second Order Nonlinear Optical Materials; Synthesis and Characterization
Abstract
Epoxy based material incorporating 4-(4'-nitrophenylazo) phenylamine has been synthesized and subsequently functionalized with cinnamoyl groups. These materials can be easily solution-processed into thin films by spin- coating. The uncrosslinked polymer has excellent thermal and linear optical properties. Glass transition temperature of 115 deg C and degradation temperature (air) of 278 deg C were recorded. This material exhibits large second order nonlinear optical (NLO) effects subsequent to poling. In a poled film sample, second harmonic generation coefficient, d33, of 34 pm/V was observed at 1.06 um. Crosslinking is brought about by exposure to UV radiation at 254 nm wavelength. In a poled and crosslinked film sample, a d33 of 22 pm/V was observed. This d33 value is less than the d33 value of the poled and uncrosslinked film sample due to photo-induced cis-trans isomerization and partial degradation o the NLO chromophores. Nevertheless, the poled and crosslinked film shows a much more stable second order response at ambient conditions compared to the poled film which has not been crosslinked.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 14, 1992
- Accession Number
- ADA251575
Entities
People
- B. K. Mandal
- Jayant Ram Kumar
- R. J . Jeng
- Sukant K. Tripathy
- Y. M. Chen
Organizations
- University of Massachusetts Lowell