PARK, SY CHO, HN KIM, N PARK, JW JIN, SH CHOI, SK WADA, T SASABE, H 2024-01-21T21:34:57Z 2024-01-21T21:34:57Z 2022-01-11 1994-07-18 0003-6951 https://pubs.kist.re.kr/handle/201004/145538 Large third-order optical nonlinearity was found with the soluble conjugated polymers (substituted polyacetylenes) synthesized by the ring-forming metathesis polymerization of 4,4-disubstituted-1,6-heptadiynes. These polymers were of quite high molecular weight (approximately 10(5)) and were highly soluble in common organic solvents. The linear optical property and the third-order optical nonlinearity of these polymers were investigated in terms of the chemical structure of the 4,4-disubstituents using the polymer films of around 100-nm thickness fabricated by the spin coating of tetrahydrofuran solutions. The pi-pi* transition of the conjugated pi-electron main chain was characterized as the strong absorption peak at around 540 nm of the electronic spectra, where the optical density of the transition was found to be largely dependent on the molar volume of the substituents. The near-resonant values of the third-order nonlinear optical coefficient, chi(3)(-3omega;omega,omega,omega) were found to be 2.6 to 6.5 x 10(-11) esu, which also were controlled by the molar volume of the substituent group. English AMER INST PHYSICS TRANSITION-METAL CATALYSTS CYCLOPOLYMERIZATION DIPROPARGYLMALONATE DERIVATIVES 3RD-ORDER OPTICAL NONLINEARITY OF CONJUGATED POLY(4,4-DISUBSTITUTED-1,6-HEPTADIYNE)S Article 10.1063/1.112349 1 APPLIED PHYSICS LETTERS, v.65, no.3, pp.289 - 291 APPLIED PHYSICS LETTERS 65 3 289 291 scie scopus A1994NY10400011 2-s2.0-0028462161 Physics, Applied Physics Article TRANSITION-METAL CATALYSTS CYCLOPOLYMERIZATION DIPROPARGYLMALONATE DERIVATIVES