Novel heterocycle-based two-photon absorbing dyes.
[structure: see text]. The synthesis and nonlinear optical characterization of two novel heteroaromatic-based chromophores is described. The new dyes present an A-pi-D-pi-A general framework, where A is a pi-deficient heteroaromatic ring (pyridine, quinoline, benzothiazole) and D a pi-excessive pyrrolyl moiety. Both systems exhibit large two-photon absorption (TPA) values in the femtoseconds regime (TPA cross section as high as 150 x 10(-50) cm(4) s photon(-1) molecule(-1) with 150 fs laser pulses). Their TPA-based optical limiting activity is also shown.
Abbotto
Alessandro
A
Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, I-20125, Milano, Italy. alessandro.abbotto@unimib.it
Beverina
Luca
L
Bozio
Renato
R
Facchetti
Antonio
A
Ferrante
Camilla
C
Pagani
Giorgio A
GA
Pedron
Danilo
D
Signorini
Raffaella
R