Damien Canneson

Centre National de la Recherche Scientifique

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Xavier Quélin

Groupe d’Étude de la Matière Condensée

Stéphanie Buil

Université de Versailles Saint-Quentin-en-Yvelines

C. Javaux

ALPhANOV (France)

Benoît Dubertret

Laboratoire de Physique et d’Étude des Matériaux

Louis Biadala

Institut d'électronique de microélectronique et de nanotechnologie

Jean‐Pierre Hermier

Université de Versailles Saint-Quentin-en-Yvelines

Ikbel Mallek Zouari

Tunis University

M. Bayer

TU Dortmund University

Maxime Berthe

Institut d'électronique de microélectronique et de nanotechnologie

B. Grandidier

École Centrale de Lille

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Paris-Saclay

École Centrale de Lille

Institut d'électronique de microélectronique et de nanotechnologie

Université de Lille

Université Polytechnique Hauts-de-France

Sorbonne Université

Groupe d’Étude de la Matière Condensée

Université de Versailles Saint-Quentin-en-Yvelines

Institut Supérieur de l'Électronique et du Numérique

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Engineering the emission of light from a scanning tunneling microscope using the plasmonic modes of a nanoparticle

Physical review. B./Physical review. B (2016)

Eric Le Moal Sylvie Marguet Damien Canneson Benoît Rogez Élizabeth Boer-Duchemin

The inelastic tunnel current in the junction formed between the tip of a scanning tunneling microscope (STM) and the sample can electrically generate optical signals. This phenomenon is potentially of great importance for nano-optoelectronic devices. In practice, however, the properties of the emitted light are difficult to control because of the strong influence of the STM tip. In this work, we show both theoretically and experimentally that the sought-after, well-controlled emission of light from an STM tunnel junction may be achieved using a nonplasmonic STM tip and a plasmonic nanoparticle on a transparent substrate. We demonstrate that the native plasmon modes of the nanoparticle may be used to engineer the light emitted in the substrate. Both the angular distribution and intensity of the emitted light may be varied in a predictable way by choosing the excitation position of the STM tip on the particle.

Light emission

Particle (ecology)

10.1103/physrevb.93.035418

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Citations (29)

Hyperfine Interactions and Slow Spin Dynamics in Quasi-isotropic InP-based Core/Shell Colloidal Nanocrystals

ACS Nano (2019)

Annalisa Brodu Mickäel D. Tessier Damien Canneson Dorian Dupont Mariana V. Ballottin

Colloidal InP core nanocrystals are taking over CdSe-based nanocrystals, notably in optoelectronic applications. Despite their use in commercial devices, such as display screens, the optical properties of InP nanocrystals and especially their relation to the exciton fine structures remain poorly understood. In this work, we show that the ensemble magneto-optical properties of InP-based core/shell nanocrystals investigated in strong magnetic fields up to 30 T are strikingly different from other colloidal nanostructures. Notably, the mixing of the lowest spin-forbidden dark exciton state with the nearest spin-allowed bright state does not occur up to the highest magnetic fields applied. This lack of mixing in an ensemble of nanocrystals suggests an anisotropy tolerance of InP nanocrystals. This striking property allowed us to unveil the slow spin dynamics between Zeeman sublevels (up to 400 ns at 15 T). Furthermore, we show that the unexpected magnetic-field-induced lengthening of the dark exciton lifetime results from the hyperfine interaction between the spin of the electron in the dark exciton with the nuclear magnetic moments. Our results demonstrate the richness of the spin physics in InP quantum dots and stress the large potential of InP nanostructures for spin-based applications.

Biexciton

10.1021/acsnano.9b03384

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Citations (11)

Negatively Charged and Dark Excitons in CsPbBr₃ Perovskite Nanocrystals Revealed by High Magnetic Fields

Nano Letters (2017)

Damien Canneson Elena V. Shornikova D. R. Yakovlev Tobias Rogge Anatolie Mitioglu

The optical properties of colloidal cesium lead halide perovskite (CsPbBr3) nanocrystals are examined by time-resolved and polarization-resolved spectroscopy in high magnetic fields up to 30 T. We unambiguously show that at cryogenic temperatures the emission is dominated by recombination of negatively charged excitons with radiative decay time of 300 ps. The additional long-lived emission, which decay time shortens from 40 down to 8 ns and in which the decay time shortens and relative amplitude increases in high magnetic fields, evidences the presence of a dark exciton. We evaluate g-factors of the bright exciton gX = +2.4, the electron ge = +2.18, and the hole gh = -0.22.

10.1021/acs.nanolett.7b02827

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Citations (115)

Blinking suppression and biexcitonic emission in thick-shell CdSe/CdS nanocrystals at cryogenic temperature

Physical Review B (2014)

Damien Canneson Louis Biadala Stéphanie Buil Xavier Quélin C. Javaux

The fluorescence of single colloidal thick-shell CdSe/CdS nanocrystals (NCs), at cryogenic temperature (4 K) and room temperature (RT), is studied using the intensity autocorrelation function (ACF) and lifetime measurements. The radiative and Auger decay rates corresponding to the desexcitation of the charged biexcitonic state are determined through an original method of photon postselection. Especially, the charged biexciton quantum yield increases from about 15% at RT to 60% at 4 K. The high inhibition of Auger recombination already observed for the trion state of CdSe/CdS NCs at low temperature is also demonstrated for the charged biexcitonic state. At 4 K, the ACF is equal to 1 for time scales ranging from 50 ns to 200 ms. In contrast with RT operation, the intensity of the trion emission is then perfectly stable and no blinking is observed. All the results highlight the strong confinement of the charge carriers in the CdSe core.

Trion

Cadmium selenide

Biexciton

Auger effect

Quantum yield

10.1103/physrevb.89.035303

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Citations (37)

Influence of the cluster’s size of random gold nanostructures on the fluorescence of single CdSe–CdS nanocrystals

Gold bulletin (2013)

Damien Canneson Stéphanie Buil Xavier Quélin C. Javaux Benoît Dubertret

It is well known that coupling a single emitter to metallic structures modifies drastically its fluorescence properties compared to single emitter in vacuum. Depending on various parameters such as the nature of the metal or the geometry of the metallic structure, quenching or intensity enhancement as well as radiative processes acceleration are obtained through the creation of new desexcitation channels. The use of metallic random structures gives the opportunity to magnify the effect of the coupling by strongly confined electromagnetic fields. A gold film at the percolation threshold is an interesting illustration of that effect. Here, we study the influence of the method used to realize these films through two different examples. First, we show that the mean size of the gold clusters constituting the film depends on the deposition method. Even if similar optical properties (in particular far-field absorption) are exhibited by the structures, crucial differences appear in the fluorescence of single emitters when coupled to the two kinds of random gold film. Especially, we focus our attention on the creation of desexcitation channels and show that they are cluster size dependent.

Nanoclusters

Percolation (cognitive psychology)

Deposition

10.1007/s13404-013-0123-8

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Synthesis and Optical Characterization of Hybrid Organic–Inorganic Heterofluorene Polymers

Macromolecules (2017)

Valentin H. K. Fell Annabel Mikosch Ann‐Kathrin Steppert Wojciech Ogieglo Erdem Senol

We synthesize heterofluorene monomers with Si, Ge, N, As, Se, and Te occupying the 9-position of the fluorene motif, which are then polymerized by Suzuki coupling. The optical properties of the obtained polymers are investigated in their solid state. We compare and elucidate effects in the materials absorption, emission, quantum yield (Φ), and fluorescence lifetime. Moreover, we determine the refractive indices n and absorption coefficient k by variable angle spectroscopic ellipsometry (VASE). We show that in addition to already known C, Si, and N containing polyfluorenes also Ge and As containing polymers exhibit amplified spontaneous emission.

Quantum yield

Ellipsometry

Characterization

10.1021/acs.macromol.6b02611

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Citations (35)

Trap-Free Heterostructure of PbS Nanoplatelets on InP(001) by Chemical Epitaxy

ACS Nano (2019)

Louis Biadala Wenbing Peng Yannick Lambert Jin Hee Kim Damien Canneson

Semiconductor nanocrystalline heterostructures can be produced by the immersion of semiconductor substrates into an aqueous precursor solution, but this approach usually leads to a high density of interfacial traps. In this work, we study the effect of a chemical passivation of the substrate prior to the nanocrystalline growth. PbS nanoplatelets grown on sulfur-treated InP (001) surfaces at temperatures as low as 95 °C exhibit abrupt crystalline interfaces that allow a direct and reproducible electron transfer to the InP substrate through the nanometer-thick nanoplatelets with scanning tunnelling spectroscopy. It is in sharp contrast with the less defined interface and the hysteresis of the current-voltage characteristics found without the passivation step. Based on a tunnelling effect occurring at energies below the bandgap of PbS, we show the formation of a type II, trap-free, epitaxial heterointerface, with a quality comparable to that grown on a nonreactive InP (110) substrate by molecular beam epitaxy. Our scheme offers an attractive alternative to the fabrication of semiconductor heterostructures in the gas phase.

Passivation

Nanocrystalline material

Chemical beam epitaxy

10.1021/acsnano.8b08413

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Citations (12)

Ultrahigh vacuum Raman spectroscopy for the preparation of III–V semiconductor surfaces

Review of Scientific Instruments (2023)

Wijden Khelifi Damien Canneson Maxime Berthe S. Legendre Christophe Coinon

Raman spectroscopy is well-suited for the characterization of semiconductor materials. However, due the weakness of the Raman signal, the studies of thin semiconductor layers in complex environments, such as ultrahigh vacuum, are rather scarce. Here, we have designed a Raman apparatus based on the use of a fiber optic probe, with a lens collecting the backscattered light directly inserted in ultrahigh vacuum. The solution has been tested for the preparation of III-V semiconductor surfaces, which requires the recovery of their atomic reconstruction. The surfaces were either protected with a thin As amorphous layer or covered with a native oxide prior to their treatment. The analysis of the Raman spectra, which was correlated with the study of the surfaces with low temperature scanning tunneling microscopy at the end of the cleaning process, shows the high potential of Raman spectroscopy for monitoring the cleanliness of III-V semiconductor heterostructures in situ.

Raman microscope

10.1063/5.0152031

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Citations (1)

Blinking suppression and biexcitonic emission in thick-shell CdSe/CdS nanocrystals at cryogenic temperature

Damien Canneson Louis Biadala Stéphanie Buil Xavier Quélin C. Javaux

It is well-known that, at the single molecule level, the fluorescence emission of semi-conductor nanocrystals (NCs) fluctuate in intensity. For regular NCs, these fluctuations are between "on and off" states, due to the existence of a complete dark state. This corresponds to the blinking phenomenon. This blinking has been associated to the very efficient Auger recombination processes. Recently, CdSe/CdS NCs with a thick (more than 5 nm) shell have been synthesized and studied [1]. The Auger lifetimes of these NCs have been measured in the range of tens of nanoseconds. The efficiency of Auger recombination and the possibility to completely suppress these processes are actively investigated, for lasing applications for example.

Auger effect

Nanosecond

Atmospheric temperature range

10.1109/cleoe-iqec.2013.6801878

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Polarized emission from single CdSe/CdS nanocrystals coupled to a 1D gold grating and a disordered structure

Conference on Lasers and Electro-Optics (2015)

Fabien Eloi Thi Phuong Lien Ung Hugo Frederich Damien Canneson Bruno Bérini

The possibility to grow thick CdS shells on CdSe core nanocrystals with variable thicknesses offers a way to control the emission of nanocrystals. First of all it is possible to get very low flickering fluorescence. Single photon sources or multiexcitonic emitters can be obtained by controlling Auger processes that depend on the shell thickness. This emission can also be controlled by coupling the nanocrystal to plasmonic structures. In this case the shell acts as a spacer, preventing quenching of the fluorescence. We have previously shown that CdSe/CdS QDs fluorescence can be dramatically modified by semi continuous gold films at the percolation threshold presenting hot spots [1]. The decay rate enhancement, corresponding to the Purcell factor can reach values as high as 200. Moreover the residual flickering of the emitter is completely suppressed and far field emission collection can be improved.

Auger effect

Purcell effect

Source

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