Efficient excitation of photoluminescence in a two-dimensional waveguide consisting of a quantum dot-polymer sandwich-type structure

Suárez, Isaac; Larrue, Alexandre; Rodríguez-Cantó, P. J.; Almuneau, Guilhem; Abargues, Rafael; Chirvony, Vs; Martínez‐Pastor, Juan P.

doi:10.1364/ol.39.004962

Cited by 17 publications

(15 citation statements)

References 15 publications

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“…The European Physical Journal Applied Physics ultrathin (∼50 nm) close packed films of QDs sandwiched between two PMMA layers, was recently developed [86]. Geometrical parameters of the waveguide were designed to propagate a pump beam with low losses together with a high generation of PL.…”

Section: -P13mentioning

confidence: 99%

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Suárez¹

2016

Eur. Phys. J. Appl. Phys.

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Abstract. Semiconductor nanocrystals have arisen as outstanding materials to develop a new generation of optoelectronic devices. Their fabrication under simple and low cost colloidal chemistry methods results in cheap nanostructures able to provide a wide range of optical functionalities. Their attractive optical properties include a high absorption cross section below the band gap, a high quantum yield emission at room temperature, or the capability of tuning the band-gap with the size or the base material. In addition, their solution process nature enables an easy integration on several substrates and photonic structures. As a consequence, these nanoparticles have been extensively proposed to develop several photonic applications, such as detection of light, optical gain, generation of light or sensing. This manuscript reviews the great effort undertaken by the scientific community to construct active photonic devices based on these nanoparticles. The conditions to demonstrate stimulated emission are carefully studied by comparing the dependence of the optical properties of the nanocrystals with their size, shape and composition. In addition, this paper describes the design of different photonic architectures (waveguides and cavities) to enhance the generation of photoluminescence, and hence to reduce the threshold of optical gain. Finally, semiconductor nanocrystals are compared to organometallic halide perovskites, as this novel material has emerged as an alternative to colloidal nanoparticles.

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Section: -P13mentioning

confidence: 99%

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Suárez¹

2016

Eur. Phys. J. Appl. Phys.

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“…A second strategy could consist of improving the design of the sample in order to provide a major concentration of QDs together with low propagation losses. In this regard, we have recently demonstrated [25] a new two-dimensional waveguide consisting of a quantum dot-polymer sandwich-type structure. This structure is able to propagate the pump beam along PMMA claddings and to improve the efficiency of excitation about 100-fold compared with a similar one formed by dispersing homogeneously the QDs in the polymer.…”

Section: Experimental Characterization Of the Pbs-su8 Qds Waveguidesmentioning

confidence: 99%

MWP phase shifters integrated in PbS-SU8 waveguides

Hervás¹,

Suárez²,

Pérez³

et al. 2015

Opt. Express

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Abstract:We present new kind of microwave phase shifters (MPS) based on dispersion of PbS colloidal quantum dots (QDs) in commercially available photoresist SU8 after a ligand exchange process. Ridge PbS-SU8 waveguides are implemented by integration of the nanocomposite in a silicon platform. When these waveguides are pumped at wavelengths below the band-gap of the PbS QDs, a phase shift in an optically conveyed (at 1550 nm) microwave signal is produced. The strong light confinement produced in the ridge waveguides allows an improvement of the phase shift as compared to the case of planar structures. Moreover, a novel ridge bilayer waveguide composed by a PbS-SU8 nanocomposite and a SU8 passive layer is proposed to decrease the propagation losses of the pump beam and in consequence to improve the microwave phase shift up to 36.5º at 25 GHz. Experimental results are reproduced by a theoretical model based on the slow light effect produced in a semiconductor waveguide due to the coherent population oscillations. The resulting device shows potential benefits respect to the current MPS technologies since it allows a fast tunability of the phase shift and a high level of integration due to its small size. 2015 Optical Society of America References and links1.

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“…Thin films of CsPbBr3 NPs were prepared from the colloidal solution using a doctor bleading technique. This deposition method ensures good film homogeneity and avoids agglomeration of the NPs, as we demonstrated previously for colloidal NPs [30].…”

Section: Cspbbr3 Np Synthesis and Sample Depositionmentioning

confidence: 77%

Structural characterization of bulk and nanoparticle lead halide perovskite thin films by (S)TEM techniques

et al. 2019

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In the last few years, lead halide (APbX3) perovskites, which are of interest for applications in photovoltaic and photonic devices, have demonstrated excellent optoelectronic performance. The structural characterization of APbX3 thin films using (scanning) transmission electron microscopy ((S)TEM) techniques can provide valuable information that can be used to understand their optoelectronic performance and device properties. However, since APbX3 perovskites are soft materials, their characterization using (S)TEM is challenging. Here, we study two APbX3 perovskite thin films: bulk CH3NH3PbI3, and nanoparticle (NP) CsPbBr3. Both specimen preparation methods and working conditions for analysis by (S)TEM are optimized. On the one hand, we show that CH3NH3PbI3 thin films grown by a one step method are composed of independent grains with random orientations. The growth method results in the formation of tetragonal perovskite films with good adherence to an underlying TiO2 layer and with a photoluminescence (PL) emission band that has a Gaussian shape and is centered at 775 nm. On the other hand, in the NP CsPbBr3 perovskite thin films the colloidal NPs, which are used as the building blocks of the film, are preserved by the deposition process. Small gaps are observed between adjacent NPs in the deposited film. The crystal structure is cubic, which is beneficial due its optimal band gap. The colloidal NPs shows similar absorption and PL in the thin film as in the colloidal solution, indicating good homogeneity and the absence of aggregation of NPs in the film. Care was required to avoid long electron irradiation times during these studies, even at a low voltage of 80 kV, as the material was observed to decompose through Pb segregation.

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Efficient excitation of photoluminescence in a two-dimensional waveguide consisting of a quantum dot-polymer sandwich-type structure

Cited by 17 publications

References 15 publications

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

MWP phase shifters integrated in PbS-SU8 waveguides

Structural characterization of bulk and nanoparticle lead halide perovskite thin films by (S)TEM techniques

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