Preparation and properties of plasmonic-excitonic nanoparticle assemblies

Abstract

The assembly of inorganic nanoparticles often leads to collective properties that are different from the combined properties of the individual components. In particular, coupling plasmonic and excitonic nanoparticles has been shown to modify their optical properties, including absorption, emission, and scattering. Because of this, these coupled assemblies have potential applications in a wide range of areas, including sensing, light harvesting, and photocatalysis. More recently, unique properties, including Fano interference and Rabi splitting, have been observed by increasing the coupling strength. However, the behavior of coupled nanoparticles is highly dependent on the exact organization of the components, including the number of particles coupled, the distance separating them, and their spatial orientation. This is especially true in the case of strongly coupled particles. Because of this, it is important to achieve synthetic techniques that not only can link particles together but also offer good control over how the particles are connected. In this review, assemblies of plasmonic and excitonic nanoparticles are reviewed, including the various methods that have been used for their construction, the properties that these systems have been predicted to possess as well as the ones that have been observed, and their current applications along with current challenges in the field and potential future applications.

Enhanced Photoluminescence of Gold Nanoparticle‐Quantum Dot Hybrids Confined in Hairy Polymer Nanofibers

“…For the last few decades, there has been significant effort in the nanomaterial research area to combine several targeted functionalities in the same structure by combination and precise spatial organization of the different nanoscale materials. The hybrid nanomaterials comprising metal‐semiconductor nanostructures have drawn enormous attention in various fields, such as bio‐imaging, sensing, functional optoelectronic devices, cancer biomarkers, and photocatalysis [1–9] . Previous reports suggest that the optical properties of fluorescent semiconductor nanoparticles placed near a metal nanoparticle (MNP) are affected by localized surface plasmon resonance (LSPR) [10–17] .…”

Efficient Biexciton Preparation in a Quantum Dot—Metal Nanoparticle System Using On-Off Pulses

“…An active research topic within the field of quantum plasmonics [ 1 , 2 ] is the efficient population control of the exciton and biexciton states in semiconductor quantum dots (SQD) closely placed to metallic nanoparticles (MNP) [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. For these hybrid nanostructures the population dynamics is rather different compared to the case of a single SQD, since the presence of the MNP amplifies the external electric field and induces interaction between SQD excitons and localized surface plasmons [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ].…”

Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

“…The local-field responses can have nontrivial features in spatial, spectral and temporal domains. Spatially, the localfield responses of nanoantennas usually feature subwavelength hot spots, which have been extensively applied to enhance light-matter interactions [2][3][4][5][6][7][8][9][10] and provide high spatial resolutions [10][11][12][13][14][15][16][17][18][19] for nano-optical applications. Complementary to local-field hot spots, the concept of local-field cold spots has also been proposed [20][21][22][23] .…”