Strong Exciton–Photon Coupling with Colloidal Nanoplatelets in an Open Microcavity

Flatten, Lucas C.; Christodoulou, Sotirios; Patel, Robin K.; Buccheri, Alexander; Coles, David M.; Reid, Benjamin P. L.; Taylor, Robert A.; Moreels, Iwan; Smith, Jason M.

doi:10.1021/acs.nanolett.6b03433

Cited by 52 publications

(74 citation statements)

References 41 publications

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“…For some effects, such as these involving chemical reactions, it is interesting to have direct access to the optical mode, which leads to the concept of an open cavity. Indeed, the traditional cavity for strong coupling is a straightforward Fabry–Perot type resonance with two mirrors, thus a closed cavity, even though there are variations possible . The material component must therefore be sandwiched in between the metallic or dielectric interfaces, which is not always easy to accomplish in practice.…”

Section: Plasmonic–metallic Structures For Scmentioning

confidence: 99%

Strong Light–Matter Coupling as a New Tool for Molecular and Material Engineering: Quantum Approach

et al. 2018

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When atoms come together and bond, these new states are called molecules and their properties determine many aspects of our daily life. Strangely enough, it is conceivable for light and molecules to bond, creating new hybrid light–matter states with far‐reaching consequences for these strongly coupled materials. Even stranger, there is no “real” light needed to obtain the effects; it simply appears from the vacuum, creating “something from nothing.” Surprisingly, the setup required to create these materials has become moderately straightforward. In its simplest form, one only needs to put a strongly absorbing material at the appropriate place between two mirrors, and quantum magic can appear. Only recently has it been discovered that strong coupling can affect a host of significant effects at a material and molecular level, which were thought to be independent of the “light” environment: phase transitions, conductivity, chemical reactions, etc. This review addresses the fundamentals of this opportunity: the quantum mechanical foundations, the relevant plasmonic and photonic structures, and a description of the various applications, connecting material chemistry with quantum information, entanglement, nonlinear optics, and chemical reactivity. Ultimately, revealing the interplay between light and matter in this new regime opens attractive avenues for various new technologies.

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Section: Plasmonic–metallic Structures For Scmentioning

confidence: 99%

Strong Light–Matter Coupling as a New Tool for Molecular and Material Engineering: Quantum Approach

et al. 2018

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“…Emission from the LPB is clearly observed and in good agreement with ARR measurements and the analytical fitting. Typical to polaritonic system at room temperature with high bandgap materials [55][56][57][58], the PL of the UPB is not observed. Note that for the large detuning δ = -92 meV, the emission accumulates next to the inflexion point of the LPB at around 20 • , possibly due to the bottleneck effect [58,59].…”

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confidence: 93%

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

et al. 2019

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Hybrid halide perovskites are now considered as key materials for contemporary research in photovoltaics and nanophotonics. In particular, because these materials can be solution processed, they represent a great hope for obtaining low cost devices. While the potential of 2D layered hybrid perovskites for polaritonic devices operating at room temperature has been demonstrated in the past, the potential of the 3D perovskites has been much less explored for this particular application. Here, we report the strong exciton-photon coupling with 3D bromide hybrid perovskite. Cavity polaritons are experimentallly demonstrated from both reflectivity and photoluminescence experiments, at room temperature, in a 3λ/2 planar microcavity containing a large surface spin-coated CH 3 NH 3 PbBr 3 thin film. A microcavity quality factor of 92 was found and a large Rabi splitting of 70 meV was measured. This result paves the way to low-cost polaritonic devices operating at room temperature, potentially electrically injectable as 3D hybrid perovskites present good transport properties.Cavity polaritons are half-light half-matter quasiparticles arising from the strong coupling regime between excitonic and photonic modes [1]. Such regime is achieved when the coupling strength, related to the oscillator strength quantifying the light-matter interaction in a material, is larger than the dissipation rates of uncoupled excitons and cavity photons. Thanks to its hybrid nature, cavity polaritons inherit the best features of both the excitonic and photonic component: strongly nonlinear bosonic particles which can propagate balistically over macroscopic distance, and can be injected/probed via optical means. These fascinating properties suggest not only a playground for studying physics of out of equilibrium Bose Einstein condensation, but also a potential platform for all-optical devices. In the later direction, many proof-of-concepts of polaritonic devices have been reported: polaritonic lasers [2], polariton transistors [3], resonant tunnelling diodes [4], interferometer [5], optical gates [3], and optical router [6]. Most of these demonstrations are in GaAs-based system the most accomplished technologies to engineer cavity polaritons. However, due to the small excitonic effects and oscillator strength in GaAs, their operating regime is limited to cryogenic temperature. For this reason, materials presenting strong excitonic effects at room temperature, such as the high band gap materials GaN [7,8] or ZnO [9, 10] are actively studied. However, the achievement of inorganic semiconductor engineered confined microstructures need sophisticated and high * emmanuelle.deleporte@ens-cachan.fr temperature epitaxial techniques. Looking for low-cost solutions, soft chemistry and low temperature processed materials presenting strong excitonic effects were also considered. The strong coupling regime at room temperature has been demonstrated in planar microcavities containing organic materials [11][12][13][14] or organic-inorganic halide perovskites such ...

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“…1 These quasi-2D NPLs have been employed in various photonic devices such as light-emitting diodes, 2 lasers, [3][4][5] and transistors. 6,7 Specifically, compared with normal colloidal semiconductor nanocrystals, NPLs are very promising in optical gain applications owing to their high oscillator strengths, 1,8,9 large absorption cross-sections, narrower emission linewidth, and suppressed Auger recombination rate. 10 In recognition of all the above merits of NPLs, low-threshold optically pumped lasing has been reported from various quasi-2D NPLs.…”

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confidence: 99%

Low-threshold lasing from colloidal CdSe/CdSeTe core/alloyed-crown type-II heteronanoplatelets

Gao

Delikanlı

et al. 2018

Nanoscale

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Colloidal type-II heterostructures are believed to be a promising solution-processed gain medium given their spatially separated electrons and holes for the suppression of Auger recombination and their wider emission tuning range from the visible to near-infrared region. Amplified spontaneous emission (ASE) was achieved from colloidal type-II core/shell nanocrystals several years ago. However, due to the limited charge-transfer (CT) interfacial states and minimal overlap of electron and hole wave functions, the ASE threshold has still been very high. Herein, we achieved ASE through type-II recombination at a lower threshold using CdSe/CdSeTe core/alloyed-crown nanoplatelets. Random lasing was also demonstrated in the film of these nanoplatelets under sub-ns laser-pumping. Through a detailed carrier dynamics investigation using femtosecond transient absorption, steady state, and time-resolved photoluminescence (PL) spectroscopies, we confirmed the type-II band alignment, and found that compared with normal CdSe/CdTe core/crown nanoplatelets (where no ASE/lasing was observed), CdSe/CdSeTe core/alloyed-crown nanoplatelets had a much higher PL quantum yield (75% vs. 31%), a ∼5-fold larger density of type-II charge-transfer states, a faster carrier transfer to interfaces (0.32 ps vs. 0.61 ps) and a slower Auger recombination lifetime (360 ps vs. 160 ps). Compared with CdSe/CdTe nanoplatelets, their counterparts with an alloyed crown boast a promoted charge transfer process, higher luminescence quantum yield, and smaller Auger rate, which results in their excellent application potential in solution-processed lasers and light-emitting devices.

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Strong Exciton–Photon Coupling with Colloidal Nanoplatelets in an Open Microcavity

Cited by 52 publications

References 41 publications

Strong Light–Matter Coupling as a New Tool for Molecular and Material Engineering: Quantum Approach

Strong Light–Matter Coupling as a New Tool for Molecular and Material Engineering: Quantum Approach

Room-Temperature Cavity Polaritons with 3D Hybrid Perovskite: Toward Large-Surface Polaritonic Devices

Low-threshold lasing from colloidal CdSe/CdSeTe core/alloyed-crown type-II heteronanoplatelets

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