Self-assembled chromophoric thin film NLO materials. Effect of coupling agent surface functionalization and ion exchange processes on second harmonic generation characteristics

Ashok K. Kakkar, Shlomo Yitzchaik, Stephen B. Roscoe, Tobin J. Marks*, Weiping Lin, George K. Wong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A systematic study of the reaction of 1-chloromethyl-4-(2-trichlorosilylethyl)-benzene (coupling agent) with the surface SiOH groups of glass for times from 15 min to 48 h, followed by stilbazole chromophore precursor deposition/quaternization, is reported. Second harmonic generation characteristics of these thin film materials indicate that a 15 min coupling agent reaction attains approximately 65% of full surface coverage (based on χzzz(2)) of benzylic chloride moieties, but that 24 h is the optimal time for maximum coverage. The surface-anchored chromophoric chloride salts in such materials undergo facile ion exchange with iodide, p-aminobenzenesulphonate, and ethyl orange, leading to enhancements in χzzz(2) of up to 50%.

Original languageAmerican English
Pages (from-to)142-145
Number of pages4
JournalThin Solid Films
Volume242
Issue number1-2
DOIs
StatePublished - 15 Apr 1994
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by the NSF-MRL program through the Materials Research Center of North-western University (Grant DMR9120521) and by the Air Force Office of Scientific Research (Contract 90-0071). A.K.K. thanks NSERC of Canada for a postdoctoral fellowship.

Fingerprint

Dive into the research topics of 'Self-assembled chromophoric thin film NLO materials. Effect of coupling agent surface functionalization and ion exchange processes on second harmonic generation characteristics'. Together they form a unique fingerprint.

Cite this