Determining random lasing action

Sapienza, Riccardo

doi:10.1038/s42254-019-0113-8

Cited by 109 publications

(95 citation statements)

References 60 publications

(80 reference statements)

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“…Different from the WGM laser made by incorporating the wr-PNDs in the microcavity as demonstrated above, the powder sample itself can work as a random laser without the need of optical coupling with an external cavity resonator 38 . In general, random lasing does not require a well-confined laser cavity but relies on multiple light scattering in a disordered scattering medium [39][40][41] . As a result, random lasers have lower coherence than the lasers based on optical cavities, thus ensuring their application in speckle-free imaging and bioimaging 42 .…”

Section: Resultsmentioning

confidence: 99%

Water-resistant perovskite nanodots enable robust two-photon lasing in aqueous environment

et al. 2020

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Owing to their large absorption cross-sections and high photoluminescence quantum yields, lead halide perovskite quantum dots (PQDs) are regarded as a promising candidate for various optoelectronics applications. However, easy degradation of PQDs in water and in a humid environment is a critical hindrance for applications. Here we develop a Pb-S bonding approach to synthesize water-resistant perovskite@silica nanodots keeping their emission in water for over six weeks. A two-photon whispering-gallery mode laser device made of these ultra-stable nanodots retain 80% of its initial emission quantum yield when immersed in water for 13 h, and a two-photon random laser based on the perovskite@silica nanodots powder could still operate after the nanodots were dispersed in water for up to 15 days. Our synthetic approach opens up an entirely new avenue for utilizing PQDs in aqueous environment, which will significantly broaden their applications not only in optoelectronics but also in bioimaging and biosensing.

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Section: Resultsmentioning

confidence: 99%

Water-resistant perovskite nanodots enable robust two-photon lasing in aqueous environment

et al. 2020

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“…All the analyzed devices are characterized by a stimulated emission with sharp lasing peaks, typical of RLs with coherent feedback. [ 2 ] It is possible to obtain an estimate of the coherence time τ c of a RL peak from the spectral linewidth Δλ according to the expression

τ_{normalc} \approx \frac{λ^{2}}{c Δ λ}

, where λ is the central emission wavelength and c is the speed of light in vacuum. In the case of a RL peak with 0.4 nm linewidth, the estimated τ c is ≈3 ps.…”

Section: Resultsmentioning

confidence: 99%

“…[ 1 ] The spectral features of a RL arise from the delicate balance between the optical gain and the scattering efficiency of the disordered matrix, that can provide two different feedback mechanisms. [ 2 ] Non‐resonant feedback results in the enhancement and narrowing of the fluorescence emission spectrum of the gain material, while resonant feedback gives rise to coherent emission spectra with distinguishable lasing peaks whose number and frequencies are typical of the scattering material. The absence of an optical cavity with a well‐defined geometry, essential for obtaining feedback in conventional lasers, opens up to various fabrication strategies for the realization of RL devices.…”

Section: Introductionmentioning

confidence: 99%

Random Laser Spectral Fingerprinting of Lithographed Microstructures

Capocefalo

Quintiero

Bianco

et al. 2021

Adv Materials Technologies

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Coherent random lasers (RLs) originate from the resonant amplification of the light scattered by disordered media resulting in spiky emission spectra with well‐defined spectral signatures. Here coherent RL emission is proposed as a tool for identifying the spectral fingerprint of porous micro‐structured materials obtained by soft lithography techniques. The close control of the spatial patterns and structural characteristics of the scattering elements enable us to obtain stable and unique RL spectra distinctive of each lithographed device. The spectral emission has been thoroughly analyzed with respect to the morphology of the devices in terms of surface roughness and surface volume fraction, demonstrating that the packing of the scattering particles is the main factor in determining a RL emission characterized by multiple linewidths with a high level of coherence. The findings provide novel insights for the realization of miniaturized photonic devices with selectable optical features.

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“…21 A random laser is an optical device based on an active molecular layer in which defects, aggregates or external beads act as scattering centers inducing light amplification. 22 As depicted in Figure 8, the patterning of the light emitter T5OCx, achieved by spontaneous molecular self-assembly driven by STD lithography, induces the formation of well-defined nanoaggregates in spatially restricted environments. Ring, stripe and pixel microarray structures were realized by depositing few microliters of a solution of T5OCx in dichloromethane on different stamps used asgeometrical constraints (Figure 8b-j).…”

Section: Random Laser From T5coxmentioning

confidence: 99%

Supramolecular Thiophene-Based Materials: A Few Examples of the Interplay between Synthesis, Optoelectronic Properties and Applications

2021

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Supramolecular nanostructured thiophene based materials with optoelectronic functions are of wide current interest and are playing a crucial role in different fields of nanoscience and nanotechnology. This short review gives a concise report of some particularly interesting examples from our own work concerning thiophene-based supramolecular architectures at multiple length scales, their function and application in devices. We start with some general considerations on the great chemical diversity of thiophene derivatives and their supramolecular architectures. Then we focus on how the supramolecular organization of specific thiophene derivatives may generate nanostructures that enable new functions and applications in devices. For each example, we report the synthesis of the corresponding thiophene derivatives.1. Introduction2. Supramolecular Organization may Impart New Functions to the System3. Supramolecular and Optoelectronic Properties of Oligothiophene-S,S-dioxides4. Colloidal Nanoparticles formed by Self-Assembly of Thiophene-Based Polymers5. Conclusions and Outlook

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Determining random lasing action

Cited by 109 publications

References 60 publications

Water-resistant perovskite nanodots enable robust two-photon lasing in aqueous environment

Water-resistant perovskite nanodots enable robust two-photon lasing in aqueous environment

Random Laser Spectral Fingerprinting of Lithographed Microstructures

Supramolecular Thiophene-Based Materials: A Few Examples of the Interplay between Synthesis, Optoelectronic Properties and Applications

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