Aurelio Rossinelli

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Rossinelli

First Name

Aurelio

ORCID

0000-0001-6930-4190

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Publications 1 - 10 of 13

Compositional Grading for Efficient and Narrowband Emission in CdSe-Based Core/Shell Nanoplatelets
Rossinelli, Aurelio; Rojo, Henar; Mule, Aniket S.; et al. (2019)
Chemistry of Materials
Template Stripping of Perovskite Thin Films for Dry Interfacing and Surface Structuring
Hernández Oendra, Alexander C.; De Leo, Eva; Koepfli, Stefan M.; et al. (2020)
ACS Applied Materials & Interfaces
Combining excellent optoelectronic properties with the benefits of solution processability, metal-halide perovskites are promising materials for photovoltaic and light-emitting technologies. To facilitate the integration of perovskite thin films into optoelectronic devices, a need exists for simple and efficient fabrication methods. Here, we present a template-stripping technique to produce ultraflat and flexible perovskite thin films. We apply a one-step spin-coating procedure to produce high-quality CH3NH3PbBr3 perovskite thin films on top of ultraflat silicon templates. These films can be mechanically cleaved from the template using a polymer adhesive to reveal the ultraflat perovskite surfaces. We demonstrate how the flatness and flexibility of the template-stripped films enable new processing strategies based on dry interfacing, by interfacing them with plasmonic hole arrays. Moreover, we show that by using prepatterned silicon templates, structured perovskite surfaces can be produced with feature sizes down to a micrometer.
Development of High-Temperature Shell-Coating Protocols for Efficient and Narrowband Emission in Colloidal Semiconductor Nanoplatelets
Rossinelli, Aurelio (2019)
Role of Gain in Fabry−Pérot Surface Plasmon Polariton Lasers
Aellen, Marianne; Rossinelli, Aurelio; Keitel, Robert; et al. (2022)
ACS Photonics
Plasmonic lasers generate strongly confined electromagnetic fields over a narrow range of wavelengths. This is potentially useful for enhancing nonlinear effects, sensing chemical species, and providing on-chip sources of plasmons. By placing a semiconductor gain layer near a metallic interface with a gap layer in between, plasmonic lasers have been demonstrated. However, the role of gain in this common design has been understudied, leading to suboptimal choices. Here, we examine planar metallic lasers and explore the effect of gain on the lasing behavior. We print semiconductor nanoplatelets as a gain layer of controllable thickness onto alumina-coated silver films with integrated planar Fabry–Pérot cavities. Lasing behavior is then monitored with spectrally and polarization-resolved far-field imaging. The results are compared with a theoretical waveguide model and a rate-equation model, which consider both plasmonic and photonic modes and explicitly include losses and gain. We find that the nature of the lasing mode is dictated by the gain-layer thickness and, contrary to conventional wisdom, a gap layer with a high refractive index can be advantageous for plasmonic lasing in planar Fabry–Pérot cavities. Our rate-equation model also reveals a regime where plasmonic and photonic modes compete in an unintuitive way, potentially useful for facile, active mode switching. These results can guide future design of metallic lasers and could lead to on-chip lasers with controlled photonic and plasmonic output.
Polarization-based colour tuning of mixed colloidal quantum-dot thin films using direct patterning
De Leo, Eva; Rossinelli, Aurelio; Marqués-Gallego, Patricia; et al. (2022)
Nanoscale
Colloidal quantum-dots (cQDs) are finding increasingly widespread application in photonics and optoelectronics, providing high brightness and record-wide colour gamuts. However, the external quantum efficiencies in thin-film device architectures are still limited due to losses into waveguide modes and different strategies are being explored to promote the outcoupling of emission. Here we use a template-stripping-based direct-patterning strategy to fabricate linear gratings at the surface of cQD thin films. The linear gratings enhance optical outcoupling through Bragg scattering, yielding bright emission with a strong degree of linear polarization. By patterning linear gratings with different periodicities and orientations onto a film of mixed-colour cQDs, we demonstrate polarization-based active colour tuning of the thin-film emission.
Compact Plasmonic Distributed-Feedback Lasers as Dark Sources of Surface Plasmon Polaritons
Brechbühler, Raphael; Vonk, Sander J.W.; Aellen, Marianne; et al. (2021)
ACS Nano
Plasmonic modes in optical cavities can be amplified through stimulated emission. Using this effect, plasmonic lasers can potentially provide chip-integrated sources of coherent surface plasmon polaritons (SPPs). However, while plasmonic lasers have been experimentally demonstrated, they have not generated propagating plasmons as their primary output signal. Instead, plasmonic lasers typically involve significant emission of free-space photons that are intentionally outcoupled from the cavity by Bragg diffraction or that leak from reflector edges due to uncontrolled scattering. Here, we report a simple cavity design that allows for straightforward extraction of the lasing mode as SPPs while minimizing photon leakage. We achieve plasmonic lasing in 10-μm-long distributed-feedback cavities consisting of a Ag surface periodically patterned with ridges coated by a thin layer of colloidal semiconductor nanoplatelets as the gain material. The diffraction to free-space photons from cavities designed with second-order feedback allows a direct experimental examination of the lasing-mode profile in real- and momentum-space, in good agreement with coupled-wave theory. In contrast, we demonstrate that first-order-feedback cavities remain “dark” above the lasing threshold and the output signal leaves the cavity as propagating SPPs, highlighting the potential of such lasers as on-chip sources of plasmons.
Controlling light emission by a thermalized ensemble of colloidal quantum dots with a metasurface
Monin, Hector; Loirette-Pelous, Aurelian; De Leo, Eva; et al. (2023)
Optics Express
We report an experimental and theoretical study of light emission by a patterned ensemble of colloidal quantum dots (cQDs). This system modifies drastically the emission spectrum and polarization as compared to a planar layer of cQDs. It exhibits bright, directional and polarized emission including a degree of circular polarization in some directions. We introduce a model of light emission based on a local Kirchhoff law which reproduces accurately all the features of the experiment. The model provides a figure of merit to assess quantitatively the emitted power. This work paves the way to the systematic design of efficient ultrathin light emitting metasurfaces with controlled polarization, spectrum and directivity.
Plasmonic films can easily be better: Rules and recipes
McPeak, Kevin M.; Jayanti, Sriharsha V.; Kress, Stephan J.P.; et al. (2015)
ACS Photonics
High-quality materials are critical for advances in plasmonics, especially as researchers now investigate quantum effects at the limit of single surface plasmons or exploit ultraviolet- or CMOS-compatible metals such as aluminum or copper. Unfortunately, due to inexperience with deposition methods, many plasmonics researchers deposit metals under the wrong conditions, severely limiting performance unnecessarily. This is then compounded as others follow their published procedures. In this perspective, we describe simple rules collected from the surface-science literature that allow high-quality plasmonic films of aluminum, copper, gold, and silver to be easily deposited with commonly available equipment (a thermal evaporator). Recipes are also provided so that films with optimal optical properties can be routinely obtained.
Observation of Electron Shakeup in CdSe/CdS Core/Shell Nanoplatelets
Antolinez, Felipe; Rabouw, Freddy T.; Rossinelli, Aurelio; et al. (2019)
Nano Letters
Nanophotonic Approach to Study Excited-State Dynamics in Semiconductor Nanocrystals
Cocina, Ario; Brechbühler, Raphael; Vonk, Sander J.W.; et al. (2022)
The Journal of Physical Chemistry Letters
In semiconductor nanocrystals, excited electrons relax through multipleradiative and nonradiative pathways. This complexity complicates characterization of theirdecay processes with standard time- and temperature-dependent photoluminescence studies.Here, we exploit a simple nanophotonic approach to augment such measurements and toaddress open questions related to nanocrystal emission. We place nanocrystals at differentdistances from a gold reflector to affect radiative rates through variations in the local density ofoptical states. We apply this approach to spherical CdSe-based nanocrystals to probe theradiative efficiency and polarization properties of the lowest dark and bright excitons byanalyzing temperature-dependent emission dynamics. For CdSe-based nanoplatelets, we identify the charge-carrier trappingmechanism responsible for strongly delayed emission. Our method, when combined with careful modeling of the influence of thenanophotonic environment on the relaxation dynamics, offers a versatile strategy to disentangle the complex excited-state decaypathways present influorescent nanocrystals as well as other emitters

Publications 1 - 10 of 13

Aurelio Rossinelli

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