Strong plasmon–exciton coupling in bimetallic nanorings and nanocuboids

Li, Na; Han, Zihong; Huang, Yuming; Liang, Kun; Wu, Fan; Qi, Xiaoying; Shang, Yingxu; Yu, Li; Ding, Baoquan

doi:10.1039/d0tc01837f

Cited by 16 publications

(20 citation statements)

References 50 publications

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“…In this case, being the SNP almost devoid of the LSPR band, observation of plexciton resonances was unlikely in any condition. In addition, the region in which the electromagnetic field was enhanced by SNPs (i.e., the effective volume [ 38 ]) could not be sufficiently large to include enough dye molecules to result in an observable plexciton [ 76 , 77 ].…”

Section: Resultsmentioning

confidence: 99%

Engineering the Aggregation of Dyes on Ligand-Shell Protected Gold Nanoparticles to Promote Plexcitons Formation

et al. 2022

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The ability to control the light–matter interaction in nanosystems is a major challenge in the field of innovative photonics applications. In this framework, plexcitons are promising hybrid light–matter states arising from the strong coupling between plasmonic and excitonic materials. However, strategies to precisely control the formation of plexcitons and to modulate the coupling between the plasmonic and molecular moieties are still poorly explored. In this work, the attention is focused on suspensions of hybrid nanosystems prepared by coupling cationic gold nanoparticles to tetraphenyl porphyrins in different aggregation states. The role of crucial parameters such as the dimension of nanoparticles, the pH of the solution, and the ratio between the nanoparticles and dye concentration was systematically investigated. A variety of structures and coupling regimes were obtained. The rationalization of the results allowed for the suggestion of important guidelines towards the control of plexcitonic systems.

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Section: Resultsmentioning

confidence: 99%

Engineering the Aggregation of Dyes on Ligand-Shell Protected Gold Nanoparticles to Promote Plexcitons Formation

et al. 2022

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“…It is likely that the establishment of direct interactions reduces the distance between the dye and the surface of the nanoparticles and increases the number of dyes within the effective volume (i.e., the volume where the NUs plasmon enhance the electromagnetic field). 57,58 This trend is also confirmed by CIT-NUs/PIC (Ω R ≈ 130 meV) and TMAOt-NUs/Cy75 (Ω R ≈ 85 meV), although the molecules compared are different. Indeed, in the interplay between dye−nanoparticle interactions and the formation of plexcitonic hybrids, the properties of dye molecules must be kept into account.…”

Section: ■ Discussionmentioning

confidence: 99%

“…Stronger coupling is observed in CIT-NUs (Ω R ≈ 120 meV) than in TMAOt-NUs (Ω R ≈ 95 meV). It is likely that the establishment of direct interactions reduces the distance between the dye and the surface of the nanoparticles and increases the number of dyes within the effective volume (i.e., the volume where the NUs plasmon enhance the electromagnetic field). , This trend is also confirmed by CIT-NUs/PIC (Ω R ≈ 130 meV) and TMAOt-NUs/Cy75 (Ω R ≈ 85 meV), although the molecules compared are different.…”

Section: Discussionmentioning

confidence: 99%

Plexcitonic Nanohybrids Based on Gold Nanourchins: The Role of the Capping Layer

2021

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Plexcitonic nanohybrids are plasmonic–excitonic novel materials whose peculiar properties are attracting considerable attention in photonics, solar cells, and sensing. These materials can be synthesized and characterized easily by assembling organic or inorganic dyes on plasmonic nanoparticles as support. However, the main factors controlling the assembly process and the occurrence of the plexcitonic coupling are still unclear. To fill this gap, in this work, we studied the plexciton coupling of 12 different dyes with a series of gold nanourchins with various coatings and sizes. Among 24 combinations tested, we observed the formation of plexcitonic hybrids only in five cases. Most of them had cyanine J-aggregates as excitonic counterparts. Stronger plexcitonic couplings were obtained when nanourchins were coated with an exchangeable citrate capping layer rather than a strong ionic thiols capping layer. We propose that the presence of a strongly bound capping layer, as in this latter case, reduces the effective volume available to the dyes.

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“…Nevertheless, to the best of our knowledge, SC based on the above hollow nanocube has not been studied. Meanwhile, J-aggregates are often used as excitons in the study of strong plasmon–exciton coupling because of their narrow absorption band and high oscillator strength in an aqueous medium and at room temperature. ,− We achieved SC using J-aggregates in a liquid phase. Based on the experimental phenomenon, we reproduced the experimental results very well using the FDTD method.…”

Section: Introductionmentioning

confidence: 99%

Strong Coupling of Ag@Au Hollow Nanocube/J-Aggregate Heterostructures by Absorption Spectra

Zhang

et al. 2022

J. Phys. Chem. C

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Achieving strong light−matter interactions at room temperature is critical for the study of quantum optics and advanced quantum applications. In this paper, we constructed a hybrid system composed of Ag@Au hollow nanocubes (HNCs) and J-aggregates to realize the strong plasmon−exciton interaction at room temperature. First, by changing the shell thickness of Ag@ Au HNCs, we tuned the localized surface plasmon resonance wavelength (λ LSPR ) near the exciton peak (575 nm). Furthermore, there is an obvious anticrossing curve in the hybrid structure, and the Rabi splitting is about 179 meV. Finally, the finite-difference time-domain (FDTD) method was utilized to simulate the absorption spectra of the above nanostructure, and the results matched well with the experimental results. We believe that achieving strong interactions lies in decreasing the volume of the local surface plasmon mode of the Ag@Au HNCs, which is approximately 8645 nm 3 . This work may provide a useful reference value for further exploration of basic optical material research or the development of advanced quantum devices.

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Strong plasmon–exciton coupling in bimetallic nanorings and nanocuboids

Abstract: We report strong plasmon–exciton coupling in bimetallic nanorings and nanocuboids, and demonstrate nanoring possesses larger enhanced electric field distribution, which enables to couple with more excitons, resulting to a larger Rabi splitting.

Cited by 16 publications

References 50 publications

Engineering the Aggregation of Dyes on Ligand-Shell Protected Gold Nanoparticles to Promote Plexcitons Formation

Engineering the Aggregation of Dyes on Ligand-Shell Protected Gold Nanoparticles to Promote Plexcitons Formation

Plexcitonic Nanohybrids Based on Gold Nanourchins: The Role of the Capping Layer

Strong Coupling of Ag@Au Hollow Nanocube/J-Aggregate Heterostructures by Absorption Spectra

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