Single Particle Spectroscopy of Radiative Processes in Colloid-to-Film-Coupled Nanoantennas

Schnepf, Max J.; Brasse, Yannic; Goßler, Fabian R.; Obermeier, Julian; Lippitz, Markus; Fery, Andreas; König, Tobias

doi:10.1515/zpch-2018-1109

Cited by 7 publications

(5 citation statements)

References 31 publications

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“…Our findings pave the way for further exploitation of plasmonic nanoparticle chains as waveguides and photonic devices. For example, the waveguide mode can be intervened at each contact point by inserting materials such as fluorescent emitters 46 and organic 47 or smart polymers 48 to further modulate and enhance the radiative properties of the plasmonic waveguide. 49 Of particular interest is the coupling at end points of the chain, which sustain particular edge states that may be tuned by complex chain geometries (e.g., bipartite chains).…”

Section: Nano Lettersmentioning

confidence: 99%

Direct Observation of Plasmon Band Formation and Delocalization in Quasi-Infinite Nanoparticle Chains

et al. 2019

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Chains of metallic nanoparticles sustain strongly confined surface plasmons with relatively low dielectric losses. To exploit these properties in applications, such as waveguides, the fabrication of long chains of low disorder and a thorough understanding of the plasmon-mode properties, such as dispersion relations, are indispensable. Here, we use a wrinkled template for directed self-assembly to assemble chains of gold nanoparticles. With this up-scalable method, chain lengths from two particles (140 nm) to 20 particles (1500 nm) and beyond can be fabricated. Electron energy-loss spectroscopy supported by boundary element simulations, finite-difference time-domain, and a simplified dipole coupling model reveal the evolution of a band of plasmonic waveguide modes from degenerated single-particle modes in detail. In striking difference from plasmonic rod-like structures, the plasmon band is confined in excitation energy, which allows light manipulations below the diffraction limit. The non-degenerated surface plasmon modes show suppressed radiative losses for efficient energy propagation over a distance of 1500 nm.

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Section: Nano Lettersmentioning

confidence: 99%

Direct Observation of Plasmon Band Formation and Delocalization in Quasi-Infinite Nanoparticle Chains

et al. 2019

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“…One of the most promising ways to employ plasmonic cavities is their impact on the emitters’ decay channels. Due to the QDs’ close proximity to the metal surfaces, the excitable states of the quantum dots are altered, leading to both faster radiative and nonradiative decays . Since the increase in radiative decay rates generally exceeds that of the nonradiative channels, the overall quantum efficiency of the QD emission improves significantly.…”

Section: Resultsmentioning

confidence: 99%

Active Plasmonic Colloid-to-Film-Coupled Cavities for Tailored Light–Matter Interactions

et al. 2019

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For large-scale fabrication of optical circuits, tailored subwavelength structures are required to modulate the refractive index. Here, we introduce a colloid-to-film-coupled nanocavity whose refractive index can be tailored by various materials, shapes, and cavity volumes. With this colloidal nanocavity setup, the refractive index can be adjusted over a wide visible wavelength range. For many nanophotonic applications, specific values for the extinction coefficient are crucial to achieve optical loss and gain. We employed bottom-up self-assembly techniques to sandwich optically active ternary metal-chalcogenides between a metallic mirror and plasmonic colloids. The spectral overlap between the cavity resonance and the broadband emitter makes it possible to study the tunable radiative properties statistically. For flat cavity geometries of silver nanocubes with sub-10 nm metallic gap, we found a fluorescence enhancement factor beyond 1000 for 100 cavities and a 112 meV Rabi splitting. In addition, we used gold spheres to extend the refractive index range. By this easily scalable colloidal nanocavity setup, gain and loss building blocks are now available, thereby leading to new generation of optical devices.

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“…The quantum yield (QD) of the assembled structures was estimated up to 25% (see Section T2 in the Supporting Information). [ 38 ]…”

Section: Methodsmentioning

confidence: 99%

“…The quantum yield (QD) of the assembled structures was estimated up to 25% (see Section T2 in the Supporting Information). [38] Confocal Fluorescence Microscopy: Confocal fluorescence microscopy (CFM) measurements were acquired with an inverted confocal scanning microscope (MicroTime 200, PicoQuant, Germany) with a 100× air objective (UPLFLN, NA 0.9, Olympus, Japan). For excitation, a picosecond pulsed p-polarized laser diode source (LDH-D-C-405, PicoQuant, Germany) with a center wavelength of 405 nm and a pulse width of 110 ps (full width at half-maximum, FWHM), driven at a repetition rate of 0.5 MHz.…”

Section: Fabrication Of Gold Gratingsmentioning

confidence: 99%

Tunable Circular Dichroism by Photoluminescent Moiré Gratings

Aftenieva

Schnepf

Mehlhorn

et al. 2020

Advanced Optical Materials

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In nanophotonics, there is a current demand for ultrathin, flexible nanostructures that are simultaneously easily tunable, demonstrate a high contrast, and have a strong response in photoluminescent polarization. In this work, the template‐assisted self‐assembly of water‐dispersed colloidal core–shell quantum dots into 1D light‐emitting sub‐micrometer gratings on a flexible substrate is demonstrated. Combining such structures with a light‐absorbing metallic counterpart by simple stacking at various angles results in a tunable Moiré pattern with strong lateral contrast. Furthermore, a combination with an identical emitter‐based grating leads to a chiroptical effect with a remarkably high degree of polarization of 0.72. Such a structure demonstrates direct circular polarized photoluminescence, for the first time, without a need for an additional chiral template as an intermediary. The suggested approach allows for reproducible, large‐area manufacturing at reasonable costs and is of potential use for chiroptical sensors, photonic circuit applications, or preventing counterfeit.

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Single Particle Spectroscopy of Radiative Processes in Colloid-to-Film-Coupled Nanoantennas

Cited by 7 publications

References 31 publications

Direct Observation of Plasmon Band Formation and Delocalization in Quasi-Infinite Nanoparticle Chains

Direct Observation of Plasmon Band Formation and Delocalization in Quasi-Infinite Nanoparticle Chains

Active Plasmonic Colloid-to-Film-Coupled Cavities for Tailored Light–Matter Interactions

Tunable Circular Dichroism by Photoluminescent Moiré Gratings

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