Nanosecond colloidal quantum dot lasers for sensing

Guilhabert, Benoit; Foucher, C.; Haughey, Anne-Marie; Mutlugün, Evren; Gao, Yuan; Herrnsdorf, Johannes; Sun, Handong; Demir, Hilmi Volkan; Dawson, Martin D.; Laurand, N.

doi:10.1364/oe.22.007308

Cited by 30 publications

(41 citation statements)

References 24 publications

(33 reference statements)

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“…Here, a graded core-shell interface likely resulted in a smooth confining potential, which has been shown to also reduce Auger rates. 221,222 Yet, while heterostructure QD lasers operated under nanosecond optical pumping, 214,223,224 >CW-pumped lasing has remained elusive. Auger recombination can also be avoided by using 2D NPLs.…”

Section: Lasersmentioning

confidence: 99%

A sustainable future for photonic colloidal nanocrystals

2015

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Colloidal nanocrystals - produced in a growing variety of shapes, sizes and compositions - are rapidly developing into a new generation of photonic materials, spanning light emitting as well as energy harvesting applications. Precise tailoring of their optoelectronic properties enables them to satisfy disparate application-specific requirements. However, the presence of toxic heavy metals such as cadmium and lead in some of the most mature nanocrystals is a serious drawback which may ultimately preclude their use in consumer applications. Although the pursuit of non-toxic alternatives has occurred in parallel to the well-developed Cd- and Pb-based nanocrystals, synthetic challenges have, until recently, curbed progress. In this review, we highlight recent advances in the development of heavy-metal-free nanocrystals within the context of specific photonic applications. We also describe strategies to transfer some of the advantageous nanocrystal features such as shape control to non-toxic materials. Finally, we present recent developments that have the potential to make substantial impacts on the quest to attain a balance between performance and sustainability in photonics.

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Section: Lasersmentioning

confidence: 99%

A sustainable future for photonic colloidal nanocrystals

2015

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“…Therefore, a polymer nanocomposite containing semiconductor nanocrystals results a flexible material which joins the active properties of the nanoparticles together with the technological feasibilities of the polymer matrices [4,76]. For example, a DFB grating fabricated on polymers containing CdSe/ZnS QDs have been proposed to demonstrate lasing [80,81], even under nanosecond excitation [81].…”

Section: Polymer Nanocompositesmentioning

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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“…The laser with only a CQD layer, Fig. 4(a), emits TEpolarised light at 589.9nm with FWHM linewidth of 0.43 nm and has a threshold fluence of 85 ± 8.5 µJ/cm 2 -this is a significant threshold improvement over previously reported CQD lasers in the nanosecond regime having threshold fluence in the range of 500 to 4000 µJ/cm 2 [5,22]). There is a secondary peak visible at 588.5 nm, which corresponds to the onset of the TM0 mode, with an oscillation threshold at approximately 160 µJ/cm 2 .The CQD/PVA DFB laser emits principally in the TE0 mode at 600 nm but the TM0 mode can be seen at 597 nm at high pump level, inset of Fig.…”

Section: Laser Characterisationmentioning

confidence: 66%

“…The performance reported here could lead to laser diode pumping of CQD lasers. This is appealing to take the technology out of the laboratory for applications such as bio-sensing [5].…”

Section: Resultsmentioning

confidence: 99%

“…They can be combined with both organic and inorganic materials to form composites and, e.g., can be patterned by soft lithography [3,4]. In turn, CQDs are finding applications in biological imaging, optoelectronics [5][6][7][8][9][10][11][12][13][14] and have also great potential as a laser material [15][16][17][18][19][20][21][22][23][24]. This is especially the case for visible lasers where the quantisation of the density of states in II-VI CQDs coupled with the flexibility of solution processing holds the promise for innovative formats of lasers at wavelengths that are important for applications but difficult to access with other laser materials, e.g.…”

Section: Introductionmentioning

confidence: 99%

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CdS_xSe_1-x/ZnS semiconductor nanocrystal laser with sub 10kW/cm^2 threshold and 40nJ emission output at 600 nm

McLellan¹,

Guilhabert²,

Laurand³

et al. 2015

Opt. Express

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This version is available at https://strathprints.strath.ac.uk/54855/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract: A colloidal quantum dot laser emitting at 600 nm with a sub 10kW/cm 2 threshold at 5ns pulse pumping is reported. The device has a second order distributed feedback cavity for vertical emission and incorporates a bilayer planar waveguide structure based on a film of yelloworange alloyed-core/shell CdSxSe1-x/ZnS quantum dots over-coated with polyvinyl alcohol. A study of the amplified spontaneous regime indicates that the quantum dot gain region behaves like a quasi-three level system and that the bilayer structure design increases the modal gain compared to a single layer of quantum dots. An output of 40nJ per pulse is measured for a total pump-to-signal efficiency above threshold of 3%. 2015 Optical Society of AmericaOCIS codes: (000.0000) General; (000.2700) General science. References and links

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Nanosecond colloidal quantum dot lasers for sensing

Cited by 30 publications

References 24 publications

A sustainable future for photonic colloidal nanocrystals

A sustainable future for photonic colloidal nanocrystals

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

CdS_xSe_1-x/ZnS semiconductor nanocrystal laser with sub 10kW/cm^2 threshold and 40nJ emission output at 600 nm

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