Random Lasing in π-Conjugated Films and Infiltrated Opals

Polson, Randy; Chipouline, A.; Vardeny, Z. Valy

doi:10.1002/1521-4095(200105)13:10<760::aid-adma760>3.0.co;2-z

Cited by 167 publications

(111 citation statements)

References 20 publications

(35 reference statements)

Supporting

Mentioning

105

Contrasting

Unclassified

Order By: Relevance

“…However, more recent experiments showed that narrow emission spikes arise in nearly the entire range of accessible scattering strengths, i.e. for strong, diffusive, and weak scattering [9][10][11]. The key parameters discerning among the three mentioned regimes are the transport mean-free path l t , over which the direction of light propagation is randomized, the size of the sample L, and the wavelength of the light [12].…”

Section: Introductionmentioning

confidence: 99%

Diffusive random laser modes under a spatiotemporal scope

et al. 2015

View full text Add to dashboard Cite

At present the prediction and characterization of the emission output of a diffusive random laser remains a challenge, despite the variety of investigated materials and theoretical interpretations given up to now. Here, a new mode selection method, based on spatial filtering and ultrafast detection, which allows to separate individual lasing modes and follow their temporal evolution is presented. In particular, the work explores the random laser behavior of a ground powder of an organic-inorganic hybrid compound based on Rhodamine B incorporated into a di-ureasil host. The experimental approach gives direct access to the mode structure and dynamics, shows clear modal relaxation oscillations, and illustrates the lasing modes stochastic behavior of this diffusive scattering system. The effect of the excitation energy on its modal density is also investigated. Finally, imaging measurements reveal the dominant role of diffusion over amplification processes in this kind of unconventional lasers. ©2015 Optical Society of America References and links1. N. M. Lawandy, R. M. Balachandran, A. S. L. Gomes, and E. Sauvain, "Laser action in strongly scattering media," Nature 368(6470), 436-438 (1994). 2. S. John and G. Pang, "Theory of lasing in a multiple-scattering medium," Phys. Rev. A 54(4), 3642-3652 (1996). 3. D. S. Wiersma and A. Lagendijk, "Light diffusion with gain and random lasers," Phys. Rev. E Stat. Phys.Plasmas Fluids Relat. Interdiscip. Topics 54(4), 4256-4265 (1996)

show abstract

Section: Introductionmentioning

confidence: 99%

Diffusive random laser modes under a spatiotemporal scope

et al. 2015

View full text Add to dashboard Cite

show abstract

“…By contrast, self-assembly would offer a promising alternative, in which the spontaneous association of microscopic building blocks leads to the energy-free creation of the desired structure. To date, self-assembled threedimensional photonic crystals of conjugated polymers have been realized in inverse configuration only; they are formed by selfassembling particles, made from passive dielectric materials such as silica or polystyrene, into colloidal crystals, backfilling the interstitial spaces with the conjugated polymer and subsequent removal of the colloidal template 5,10 . Ideally however, such photonic devices are prepared through self-assembly alone, without further expenditure of energy or the necessity of costly postprocessing steps.…”

mentioning

confidence: 99%

Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

2012

View full text Add to dashboard Cite

The self-assembly of colloidal building blocks into complex and hierarchical structures offers a versatile and powerful toolbox for the creation of new photonic and optoelectronic materials. However, well-defined and monodisperse colloids of semiconducting polymers, which would form excellent building blocks for such self-assembled materials, are not readily available. Here we report the first demonstration of a suzuki-miyaura dispersion polymerization; this method produces highly monodisperse submicrometer particles of a variety of semiconducting polymers. moreover, we show that these monodisperse particles readily self-assemble into photonic crystals that exhibit a pronounced photonic stopgap.

show abstract

“…Processability of the active materials is obviously crucial to their incorporation into organic PhC, and, interestingly, water-soluble conjugated polymers with high photoluminescence (PL) efficiency provide an intriguing opportunity for use in combination with plastic PhC templates, but only a few attempts have been reported so far. [19][20][21][22] Conjugated polyelectrolytic rotaxanes 23 ( Fig. 1) offer a very interesting class of materials to incorporate into PhCs since they benefit from a supramolecular architecture in which conjugated backbones such as poly(4,4 -diphenylene vinylene) (PDV) are threaded through cyclodextrin rings (β-CD), that sterically impose increased intermolecular distances.…”

mentioning

confidence: 99%

Fluorescent polystyrene photonic crystals self-assembled with water-soluble conjugated polyrotaxanes

et al. 2013

View full text Add to dashboard Cite

We demonstrate control of the photoluminescence spectra and decay rates of water-soluble green-emitting conjugated polyrotaxanes by incorporating them in polystyrene opals with a stop-band spectrally tuned on the rotaxane emission (405–650 nm). We observe a suppression of the luminescence within the photonic stop-band and a corresponding enhancement of the high-energy edge (405–447 nm). Time-resolved measurements reveal a wavelength-dependent modification of the emission lifetime, which is shortened at the high-energy edge (by ∼11%, in the range 405–447 nm), but elongated within the stop-band (by ∼13%, in the range 448–482 nm). We assign both effects to the modification of the density of photonic states induced by the photonic crystal band structure. We propose the growth of fluorescent composite photonic crystals from blends of “solvent-compatible” non-covalently bonded nanosphere-polymer systems as a general method for achieving a uniform distribution of polymeric dopants in three-dimensional self-assembling photonic structures

show abstract

Random Lasing in π-Conjugated Films and Infiltrated Opals

Cited by 167 publications

References 20 publications

Diffusive random laser modes under a spatiotemporal scope

Diffusive random laser modes under a spatiotemporal scope

Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

Fluorescent polystyrene photonic crystals self-assembled with water-soluble conjugated polyrotaxanes

Contact Info

Product

Resources

About