We investigated the gain properties of spin coated films of a soluble substituted quinque-thiophene under ns pulsed optical excitation. The oligomer exhibits a clear line narrowing, due to amplified spontaneous emission assisted by waveguiding film slab, for excitation fluences larger than 0.8 mJ cm–2. The oligothiophene was employed as the active medium of different organic resonators. In particular, we report about directly printed organic distributed-feedback resonators, exploiting the one-dimensional periodic modulation of the organic surface. The devices exhibit single-mode emission between 630 and 640 nm, with a full width half maximum of about 1 nm and a pump threshold as low as 140 µJ/cm2 at room temperature. These results make the substituted oligothiophenes excellent candidates as active media of optically-confined nanostructures.
Solid-state laser devices based on an optically-confined oligothiophene-S,S-dioxide
PISIGNANO, Dario;PERSANO, Luana;VISCONTI, Paolo;GIGLI, Giuseppe;CINGOLANI, Roberto;
2004-01-01
Abstract
We investigated the gain properties of spin coated films of a soluble substituted quinque-thiophene under ns pulsed optical excitation. The oligomer exhibits a clear line narrowing, due to amplified spontaneous emission assisted by waveguiding film slab, for excitation fluences larger than 0.8 mJ cm–2. The oligothiophene was employed as the active medium of different organic resonators. In particular, we report about directly printed organic distributed-feedback resonators, exploiting the one-dimensional periodic modulation of the organic surface. The devices exhibit single-mode emission between 630 and 640 nm, with a full width half maximum of about 1 nm and a pump threshold as low as 140 µJ/cm2 at room temperature. These results make the substituted oligothiophenes excellent candidates as active media of optically-confined nanostructures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
