Random lasing from dye-gold nanoparticles in polymer films: Enhanced gain at the surface-plasmon-resonance wavelength

Popov, O. E.; Zilbershtein, A. Kh.; Davidov, D.

doi:10.1063/1.2364857

Cited by 151 publications

(98 citation statements)

References 12 publications

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“…Unlike in ordinary lasers, the resulting light emission is multidirectional, but the threshold behaviour 3 , the photon statistics 10,11 and relaxation oscillations 12,13 are very similar to those of standard lasers. The spectral output of a random laser system contains narrow emission spikes 4 , which for large spectral width can merge into a smooth peak with an overall narrowing of the spectrum in most experimental configurations 3,14 , like the one considered in this paper.…”

mentioning

confidence: 99%

Resonance-driven random lasing

Sapienza

García

Gottardo³

et al. 2008

Nature Photon

271

183

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A random laser is a system formed by a random assembly of elastic scatterers dispersed into an optical gain medium 1 . The multiple light scattering replaces the standard optical cavity of traditional lasers and the interplay between gain and scattering determines the lasing properties. All random lasers studied to date have consisted of irregularly shaped or polydisperse scatterers, with a certain average scattering strength that was constant over the frequency window of the laser [2][3][4] . In this letter we consider the case where the scattering is resonant. We demonstrate that randomly assembled monodisperse spheres can sustain scattering resonances over the gain frequency window, and that the lasing wavelength can therefore be controlled by means of the diameter and refractive index of the spheres. The system is therefore a random laser with an a priori designed lasing peak within the gain curve.In recent years the interest in random lasing has grown very rapidly, particularly following the observation of this phenomenon in powdered laser crystals 5 , ceramics 6 , organic composites 7 , and even biological tissue 8 . The necessary condition for a random laser is that the material is multiply scattering light, which means that the transport mean free path (the average distance over which the scattered light direction is randomized) ' t ( L, where L is the sample size. The other fundamental quantity is the gain length ' g , which represents the path length over which the intensity is amplified by a factor e þ1 . The interaction between gain and scattering determines the unique properties of the random laser and, in particular, defines the critical thickness for the sample (in slab geometry) to lase,. Unlike in ordinary lasers, the resulting light emission is multidirectional, but the threshold behaviour 3 , the photon statistics 10,11 and relaxation oscillations 12,13 are very similar to those of standard lasers. The spectral output of a random laser system contains narrow emission spikes 4 , which for large spectral width can merge into a smooth peak with an overall narrowing of the spectrum in most experimental configurations 3,14 , like the one considered in this paper.Wavelength tunability is a crucial property of lasing devices. In regular lasers this is easily achieved by tuning the resonance frequency of the resonator. The same principle has also been applied in more complex cavity structures, such as distributed feedback lasers and photonic crystals lasers, in which the cavity modes are the Bloch modes associated with the periodic structure. Tuning the lattice constant then provides a simple tool to tune the laser for high-quality photonic crystals 15,16 or with localized periodicity 17,18 . These tricks do not work in random structures due to the absence of periodicity. Here we will show, however, that even in a completely random system with no periodicity, resonant tunability can be achieved based on singleparticle resonances.A random system, composed of particles of arbitrary shape and size, has a...

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mentioning

confidence: 99%

Resonance-driven random lasing

Sapienza

García

Gottardo³

et al. 2008

Nature Photon

271

183

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“…Thus in a first attempt to achieve random lasing in CQD films, we made use of gold nanoparticles, integrated into the wave-guiding SILAR I CQD film, similar as has been reported previously. [60][61] To efficiently scatter the emission from the CQDs, the plasmon resonance of the gold nanoparticles needs to overlap with the CQD PL spectrum. Thus we have chosen star shaped gold nanoparticles exhibiting a broad extinction maximum at 647 nm due to Rayleigh scattering 62 close to the CQD's PL peak ( Figure 2a).…”

mentioning

confidence: 99%

Random Lasing with Systematic Threshold Behavior in Films of CdSe/CdS Core/Thick-Shell Colloidal Quantum Dots

Gollner¹,

Ziegler²,

Proteşescu

et al. 2015

ACS Nano

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KEYWORDS giant shell quantum dots, successive ion layer adsorption and reaction, random lasing, exciton-exciton interactions, plasmonics ABSTRACT While over the last years the syntheses of colloidal quantum dots (CQDs) with core/shell structures were continuously improved to obtain highly efficient emission, it has remained a challenge to use them as active materials in laser devices. Here, we report on a successful demonstration of random lasing at room temperature in films of CdSe/CdS CQDs with different core/shell band alignments and extra thick shells. Even though the lasing process is based on random scattering, we find systematic dependencies of the laser thresholds on film morphology and excitation spot size. This systematics suggests that random lasing experiments are a valuable tool for testing nanocrystal materials, providing a direct and simple feedback for the further development of colloidal gain materials towards lasing in continuous wave operation.

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“…In particular, random lasing based on localized surface plasmon resonances (LSPR) have demonstrated the characteristics of low threshold and high performance [7][8][9][10][11][12][13][14][15][16][17][18][19]. For example, Popov et al [14] found that gold nanoparticles enhanced the gain in random laser system containing dyes and gold nanoparticles. To achieve random lasing with lower threshold and multicolor emissions, nanogap-based random lasing was proposed by choosing the gold-silver (Au-Ag) bimetallic porous nanowires with abundant nanogaps that provide strong feedback or gain channels for coherent lasing from dye molecules [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Various random lasers have been demonstrated based on dielectric nanoparticle scattering [7][8][9] and metal nanoparticle surface plasmonic scattering [10][11][12][13]. In particular, random lasing based on localized surface plasmon resonances (LSPR) have demonstrated the characteristics of low threshold and high performance [7][8][9][10][11][12][13][14][15][16][17][18][19]. For example, Popov et al [14] found that gold nanoparticles enhanced the gain in random laser system containing dyes and gold nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Broadband plasmonic silver nanoflowers for high-performance random lasing covering visible region

Chang

Shi

et al. 2017

Nanophotonics

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Multicolor random lasing has broad potential applications in the fields of imaging, sensing, and optoelectronics. Here, silver nanoflowers (Ag NF) with abundant nanogaps are fabricated by a rapid one-step solution-phase synthesis method and are first proposed as effective broadband plasmonic scatterers to achieve different color random lasing. With abundant nanogaps and spiky tips near the surface and the interparticle coupling effect, Ag NFs greatly enhance the local electromagnetic field and induce broadband plasmonic scattering spectra over the whole visible range. The extremely low working threshold and the high-quality factor for Ag NF-based random lasers are thus demonstrated as 0.24 MW cm −2 and 11,851, respectively. Further, coherent colorful random lasing covering the visible range is realized using the dye molecules oxazine (red), Coumarin 440 (blue), and Coumarin 153 (green), showing high-quality factor of more than 10,000. All these features show that Ag NF are highly efficient scatterers for high-performance coherent random lasing and colorful random lasers.

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Random lasing from dye-gold nanoparticles in polymer films: Enhanced gain at the surface-plasmon-resonance wavelength

Cited by 151 publications

References 12 publications

Resonance-driven random lasing

Resonance-driven random lasing

Random Lasing with Systematic Threshold Behavior in Films of CdSe/CdS Core/Thick-Shell Colloidal Quantum Dots

Broadband plasmonic silver nanoflowers for high-performance random lasing covering visible region

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