Emerging plasmonic nanostructures for controlling and enhancing photoluminescence

Park, Jeong-Eun; Kim, Jiyeon; Nam, Jwa‐Min

doi:10.1039/c7sc01441d

Cited by 94 publications

(91 citation statements)

References 67 publications

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“…The energy is eventually dissipated in the metal (ohmic loss), though it can be emitted by the metal with a very low quantum efficiency. Coupling between dipole emitters and SPs may also modify the emission direction and polarization [51][52][53][54]. The light emission from a quantum emitter can be steered in a specific direction in space by either using simple anisotropic plasmonic nanostructures that exhibit angular and polarization dependent SP resonances or by designing more complex, multicomponent plasmonic nanostructures, such as optical Yagi-Uda nanoantennas [61,62].…”

Section: The Exciton-plasmon Composite System: Backgroundmentioning

confidence: 99%

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Quantum dot plasmonics: from weak to strong coupling

2019

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The complementary optical properties of surface plasmon excitations of metal nanostructures and long-lived excitations of semiconductor quantum dots (QDs) make them excellent candidates for studies of optical coupling at the nanoscale level. Plasmonic devices confine light to nanometer-sized regions of space, which turns them into effective cavities for quantum emitters. QDs possess large oscillator strengths and high photostability, making them useful for studies down to the single-particle level. Depending on structure and energy scales, QD excitons and surface plasmons (SPs) can couple either weakly or strongly, resulting in different unique optical properties. While in the weak coupling regime plasmonic cavities (PCs) mostly enhance the radiative rate of an emitter, in the strong coupling regime the energy level of the two systems mix together, forming coupled matter-light states. The interaction of QD excitons with PCs has been widely investigated experimentally as well as theoretically, with an eye on potential applications ranging from sensing to quantum information technology. In this review we provide a comprehensive introduction to this exciting field of current research, and an overview of studies of QD-plasmon systems in the weak and strong coupling regimes.

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Section: The Exciton-plasmon Composite System: Backgroundmentioning

confidence: 99%

“…The weak coupling regime5.1 Underlying physicsWhen an emitter is weakly coupled to a PC, its PL is modified in multiple ways[51][52][53][54], which may include reshaping of its spectrum and polarization, intensity enhancement or quenching, modulation of radiative and non-radiative…”

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confidence: 99%

Quantum dot plasmonics: from weak to strong coupling

2019

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“…To be an efficient fluorescent probe for imaging applications, the thickness of the metallic shell is another critical parameter that significantly impacts on the optical properties (i.e., LSPR and light transmittance) of core–gap–shell nanostructures . For example, tuning the thickness of the Au shell would give rise to a shift in LSPR of the nanostructures.…”

Section: Discussionmentioning

confidence: 99%

Functional Macromolecule‐Enabled Colloidal Synthesis: From Nanoparticle Engineering to Multifunctionality

Zhou

Hou

et al. 2019

Advanced Materials

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IntroductionColloidal nanoparticles of metals, metal oxides, semiconductors, and metal-organic frameworks (MOFs) are of significant interest in both fundamental research and practical applications, due to their unique optical, electrical, and catalytic properties. [1][2][3] Small molecule-based wet-chemical colloidal synthesis of nanoparticles has undergone considerable progress in precise control over structural parameters of products, such as their size, shape, composition, crystal facet, and surface The synthesis of well-defined inorganic colloidal nanostructures using functional macromolecules is an enabling technology that offers the possibility of fine-tuning the physicochemical properties of nanomaterials and has contributed to a broad range of practical applications. The utilization of functional reactive polymers and their colloidal assemblies leads to a high level of control over structural parameters of inorganic nanoparticles that are not easily accessible by conventional methods based on small-molecule ligands. Recent advances in polymerization techniques for synthetic polymers and newly exploited functions of natural biomacromolecules have opened up new avenues to monodisperse and multifunctional nanostructures consisting of integrated components with distinct chemistries but complementary properties. Here, the evolution of colloidal synthesis of inorganic nanoparticles is revisited. Then, the new developments of colloidal synthesis enabled by functional macromolecules and practical applications associated with the resulting optical, catalytic, and structural properties of colloidal nanostructures are summarized. Finally, a perspective on new and promising pathways to novel colloidal nanostructures built upon the continuous development of polymer chemistry, colloidal science, and nanochemistry is provided. Functional Macromolecules

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“…One remarkable observation is that the signal intensity of the SERS-BG correlates with the signal intensity of the analyte 39,43−45 . Moore et al 43 revealed a relationship of analyte signals and SERS-BG signals of Rhodamine 6G enhanced by colloidal silver via 2D correlation analysis in dependence of the Raman shift. Mahajan et al 39 showed that the relation between the SERS-BG maximum signal intensity and analyte signal intensity is dependent of the SERS substrate plasmon properties, the type of molecule as well as the analyte coverage.…”

Section: Introductionmentioning

confidence: 99%

SERS background imaging – A versatile tool towards more reliable SERS analytics

Ebersbach

Münchberg

Freier

2020

Preprint

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Surface-enhanced Raman scattering (SERS) is a highly selective and sensitive straightforward analytical method, which is however not yet established in routine analysis due to a lack of reliability and reproducibility. To address this limitation, we show the distinct correlation of the ever-present but often neglected broad SERS background continuum with the SERS signal intensity of the analyte and how to exploit this correlation for an easy-to-handle, automatable and more reliable SERS measurement. First, fast and high-contrast imaging of the SERS substrate is performed for hot spot localisation utilizing the SERS background. Subsequently, highly enhanced SERS spectra are recorded at the centre of these spots. Furthermore, we correlate our SERS background imaging with other optical imaging modalities and electron microscopy to assess structure-property relationships. Monte Carlo simulations based on actual measurements illustrate the sampling error of a conventional SERS experiment and the advantages our method provides.

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Emerging plasmonic nanostructures for controlling and enhancing photoluminescence

Abstract: Here, we review recent advances and provide perspectives in photoluminescence modulation and enhancement with plasmonic nanostructures.

Cited by 94 publications

References 67 publications

Quantum dot plasmonics: from weak to strong coupling

Quantum dot plasmonics: from weak to strong coupling

Functional Macromolecule‐Enabled Colloidal Synthesis: From Nanoparticle Engineering to Multifunctionality

SERS background imaging – A versatile tool towards more reliable SERS analytics

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