Preparation and Optical Absorption Spectra of Dye-Coated Au, Ag, and Au/Ag Colloidal Nanoparticles in Aqueous Solutions and in Alternate Assemblies

Kometani, Noritsugu; Tsubonishi, Makoto; Fujita, Takeshi; Asami, and Kenji; Yonezawa, Yoshiro

doi:10.1021/la0013190

Cited by 187 publications

(212 citation statements)

References 18 publications

(40 reference statements)

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“…These hybrid systems often consist of a core-shell geometry in which the localized surface plasmon resonance (LSPR) of the metallic core couples with the exciton resonance exhibited by a J-aggregate dye or a quantum dot shell. [1][2][3][4][5][6][7][8][9][10] This architecture provides a means of studying plasmon-exciton interactions, which have resulted in unique optical phenomena such as induced transparency. 1,2,[5][6][11][12] The ability to control the morphology and dimensions of the individual layers at the nanoscale, and the subsequent control of optical properties, are ultimately what drive this field of research.…”

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confidence: 99%

Coherent Plasmon-Exciton Coupling in Silver Platelet-J-aggregate Nanocomposites

Miller²,

et al. 2015

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Hybrid nanostructures that couple plasmon and exciton resonances generate hybridized energy states, called plexcitons, which may result in unusual light-matter interactions. We report the formation of a transparency dip in the visible spectra of colloidal suspensions containing silver nanoplatelets and a cyanine dye, 1,1′-diethyl-2,2′-cyanine iodide (PIC). PIC was electrostatically adsorbed onto the surface of silver nanoplatelet core particles, forming an outer J-aggregate shell. This core−shell architecture provided a framework for coupling the plasmon resonance of the silver nanoplatelet core with the exciton resonance of the J-aggregate shell. The sizes and aspect ratios of the silver nanoplatelets were controlled to ensure the overlap of the plasmon and exciton resonances. As a measure of the plasmon-exciton coupling strength in the system, the experimentally observed transparency dips correspond to a Rabi splitting energy of 207 meV, among the highest reported for colloidal nanoparticles. The optical properties of the silver platelet-J-aggregate nanocomposites were supported numerically and analytically by the boundary-element method and temporal coupled-mode theory, respectively. Our theoretical predictions and experimental results confirm the presence of a transparency dip for the silver nanoplatelet core Jaggregate shell structures. Additionally, the numerical and analytical calculations indicate that the observed transparencies are dominated by the coupling of absorptive resonances, as opposed to the coupling of scattering resonances. Hence, we describe the suppressed extinction in this study as an induced transparency rather than a Fano resonance.

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Coherent Plasmon-Exciton Coupling in Silver Platelet-J-aggregate Nanocomposites

Miller²,

et al. 2015

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“…1 Subwavelength structures on resonance can have scattering cross sections much larger than their geometrical sizes, 2,3 and the presence of multiple resonances leads to even more possibilities through mode hybridization 4 and interference effects. [5][6][7][8][9] A particularly interesting phenomenon is the suppressed scattering in nanostructures with multiple plasmonic resonances, [10][11][12][13][14][15][16][17][18][19][20][21][22][23] plasmonic and excitonic resonances, [24][25][26][27][28][29][30] or dielectric resonances, 31,32 referred to collectively as a "scattering dark state." A wealth of models has been employed to describe this suppressed scattering, ranging from perturbative models, 12 generalization of the Fano formula, [13][14][15] and electrostatic approximation, 22,23 to coupled-mechanical-oscillator models.…”

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confidence: 99%

Theoretical Criteria for Scattering Dark States in Nanostructured Particles

et al. 2014

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Nanostructures with multiple resonances can exhibit a suppressed or even completely eliminated scattering of light, called a scattering dark state. We describe this phenomenon with a general treatment of light scattering from a multi-resonant nanostructure that is spherical or non-spherical but subwavelength in size. With multiple resonances in the same channel (i.e. same angular momentum and polarization), coherent interference always leads to scattering dark states in the low-absorption limit, regardless of the system details. The coupling between resonances is inevitable and can be interpreted as arising from far-field or near-field. This is a realization of coupled- and interference effects. 5-9 A particularly interesting phenomenon is the suppressed scattering in nanostructures with multiple plasmonic resonances, [10][11][12][13][14][15][16][17][18][19][20][21][22][23] plasmonic and excitonic resonances, [24][25][26][27][28][29][30] or dielectric resonances, 31,32 referred to collectively as a "scattering dark state." A wealth of models has been employed to describe this suppressed scattering, ranging from perturbative models, 12 generalization of the Fano formula, 13-15 and electrostatic approximation, 22,23 to coupled-mechanical-oscillator models. 17-21 These models reveal valuable insights and facilitate the design of specific structures with desired line shapes. However, the general criteria for observing such scattering dark states remain unclear. Non-scattering states have been known in atomic physics since the early works of Fano 33 and have been discovered in a variety of nanoscale systems in recent years [5][6][7][8]34,35 . However, Fano resonances generally concern the interference between a narrow discrete resonance and a broad resonance or continuum. Meanwhile, many occurrences of the scattering dark state involve the interference between multiple narrow discrete resonances, and it seems necessary to treat the multiple resonances at equal footing. Thus, we seek a formalism analogous to the phenomenon of coupled-resonator-induced transparency 5 that has been established in certain other systems such as coupled mechanical oscillators 36,37 , coupled cavities 38,39 , coupled microring resonators [40][41][42][43][44] , and planar metamaterials [45][46][47][48] .Here, we derive the general equations governing the resonant light scattering from a spherical or a non-spherical but subwavelength obstacle, accounting for multiple resonances with low loss. Due to the spherical symmetry (or the small size) of the obstacle, different channels of the multipole fields are decoupled. We find that within each channel, n resonances always lead to n − 1 scattering dark states in the low-absorption limit. This universal result is independent of the radiative decay rates of the resonances, method of coupling (can be 3 near-field or far-field), nature of the resonances (can be plasmon, exciton, whispering-gallery, etc.), number of resonances, which of the multipole, TE or TM polarization, and other system det...

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“…The hybrid nanostructure of the Ag nanoprism-JA is formed by selfassembly of the dye molecules on the Ag nanoprism surfaces and thus conformal coating of the nanoprisms can be achieved. 9,[23][24][25] This simple synthesis of Ag nanoprism-JAs hybrid nanostructure is highly reproducible allowing preparation of high quality hybrid nanostructures for plasmonic applications. 9 Transient absorption measurements were carried out with femtosecond temporal resolution using a femtosecond pump-probe method [ Fig.…”

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confidence: 99%

Probing ultrafast energy transfer between excitons and plasmons in the ultrastrong coupling regime

Balci

Kocabaş

Küçüköz

et al. 2014

Applied Physics Letters

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Cataloged from PDF version of article.We investigate ultrafast energy transfer between excitons and plasmons in ensembles of core-shell type nanoparticles consisting of metal core covered with a concentric thin J-aggregate (JA) shell. The high electric field localization by the Ag nanoprisms and the high oscillator strength of the JAs allow us to probe this interaction in the ultrastrong plasmon-exciton coupling regime. Linear and nonlinear optical properties of the coupled system have been measured using transient absorption spectroscopy revealing that the hybrid system shows half-plasmonic and half-excitonic properties. The tunability of the nanoprism plasmon resonance provides a flexible platform to study the dynamics of the hybrid state in a broad range of wavelengths. (C) 2014 AIP Publishing LLC

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Preparation and Optical Absorption Spectra of Dye-Coated Au, Ag, and Au/Ag Colloidal Nanoparticles in Aqueous Solutions and in Alternate Assemblies

Cited by 187 publications

References 18 publications

Coherent Plasmon-Exciton Coupling in Silver Platelet-J-aggregate Nanocomposites

Coherent Plasmon-Exciton Coupling in Silver Platelet-J-aggregate Nanocomposites

Theoretical Criteria for Scattering Dark States in Nanostructured Particles

Probing ultrafast energy transfer between excitons and plasmons in the ultrastrong coupling regime

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