Tailoring Plasmon Coupling in Self-Assembled One-Dimensional Au Nanoparticle Chains through Simultaneous Control of Size and Gap Separation

Chen, Tianhong; Pourmand, Mahshid; Feizpour, Amin; Cushman, Bradford; Reinhard, Björn M.

doi:10.1021/jz401066g

Cited by 96 publications

(101 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…47 Most recently, the groups of Mulvaney and Reinhard used dark-field scattering single particle spectroscopy to demonstrate the onset for the saturation of the redshifting in the superradiant plasmon mode for individual chains that were composed of Au NPs with diameters of 64 and 40 nm, respectively, and were one NP wide with a maximum length of 7 NPs. 3,25 Accompanying theory highlights the sensitivity of the optical response on the interparticle gap as increasing D/r decreases the overall redshift achieved upon reaching the infinite chain limit.…”

Section: -52mentioning

confidence: 99%

“…[1][2][3][4][5][6][7] To explain the collective behavior of coupled surface plasmons, several different concepts have been inspired by well-established theories developed in physics and chemistry, such as plasmon hybridization. 4,6 , group theory 8 , Fano resonances 2,9 , and superradiance.…”

Section: Introductionmentioning

confidence: 99%

“…3,15,[21][22][23][24] Finally, distributions in NP size and arrangement, often inherent to experimental systems, modify the collective optical response, but the effect of such disorder is overall small for the energy of the superradiant mode in large NP assemblies and generally only leads to changes in relative peak intensities and linewidths. 3,14,[25][26][27][28] This behavior parallels the insensitivity of the optical spectra measured for conjugated polymers having a variety of chain lengths and conformations as their optical properties are governed by localized chromophores consisting of a minimum number of repeat units. 17,19,20,[29][30][31] Both individual NPs and simple assemblies of NPs, or plasmonic molecules, can serve as the repeating monomer unit in plasmonic polymers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plasmonic polymers unraveled through single particle spectroscopy

et al. 2014

View full text Add to dashboard Cite

Plasmonic polymers are quasi one-dimensional assemblies of nanoparticles whose optical responses are governed by near-field coupling of localized surface plasmons. Through single particle extinction spectroscopy correlated with electron microscopy, we reveal the effect of the composition of the repeat unit, the chain length, and extent of disorder on the energies, intensities, and line shapes of the collective resonances of individual plasmonic polymers constructed from three different sizes of gold nanoparticles. Our combined experiment and theoretical analysis focuses on the superradiant plasmon mode, which results from the most attractive interactions along the nanoparticle chain and yields the lowest energy resonance in the spectrum. This superradiant mode redshifts with increasing chain length until an infinite chain limit, where additional increases in chain length cause negligible change in the energy of the superradiant mode. We find that, among plasmonic polymers of equal width comprising nanoparticles with different sizes, the onset of the infinite chain limit and its associated energy are dictated by the number of repeat units and not the overall length, of the polymer. The intensities and linewidths of the superradiant mode relative to higher energy resonances, however, differ as the size and number of nanoparticles are varied in the plasmonic polymers studied here. These findings provide general guidelines for engineering the energies, intensities, and line shapes of the collective optical response of plasmonic polymers constructed from nanoparticles with sizes ranging from a few tens to one hundred nanometers.

show abstract

Section: -52mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plasmonic polymers unraveled through single particle spectroscopy

et al. 2014

View full text Add to dashboard Cite

show abstract

“…EBL) for the subsequent assembly of colloidal NPs onto the lithographically defined assembly sites [24]. While EBL makes it possible to define the separation, Λ, between individual assembly sites on the tens to hundreds of nanometer scale, the separation within the self-assembled clusters is determined by the assembly conditions as well as the surface of the assembled nanoparticles, and is typically on the few nanometer length scale or below [58]. The unique flexibility for realizing nanoparticle separations over such a broad range makes the template guided self-assembly a useful tool for realizing multiscale nanoparticle arrays.…”

Section: Fabrication Of Extended Optoplasmonic Arrays Through Templatmentioning

confidence: 99%

Coupled-Mode Theory and Its Applications on Computational Nanophotonics

2015

Integrated Nanophotonic Resonators

View full text Add to dashboard Cite

Abstract:The integration of metallic and dielectric building blocks into optoplasmonic structures creates new electromagnetic systems in which plasmonic and photonic modes can interact in the near-, intermediate-and farfield. The morphology-dependent electromagnetic coupling between the different building blocks in these hybrid structures provides a multitude of opportunities for controlling electromagnetic fields in both spatial and frequency domain as well as for engineering the phase landscape and the local density of optical states. Control over any of these properties requires, however, rational fabrication approaches for well-defined metal-dielectric hybrid structures. Template-guided self-assembly is a versatile fabrication method capable of integrating metallic and dielectric components into discrete optoplasmonic structures, arrays, or metasurfaces. The structural flexibility provided by the approach is illustrated by two representative implementations of optoplasmonic materials discussed in this review. In optoplasmonic atoms or molecules optical microcavities (OMs) serve as whispering gallery mode resonators that provide a discrete photonic mode spectrum to interact with plasmonic nanostructures contained in the evanescent fields of the OMs. In extended hetero-nanoparticle arrays in-plane scattered light induces geometry-dependent photonic resonances that mix with the localized surface plasmon resonances of the metal nanoparticles. We characterize the fundamental electromagnetic working principles underlying both optoplasmonic approaches and review the fabrication strategies implemented to realize them.

show abstract

“…Besides the structure or size [22] of the particle cluster, the interparticle distance between the building blocks [21,23] has also a profound effect on the evolving coupled mode. It has to be emphasized that in a real experiment -independently of the resulting structure -the clustering process usually generates a distribution of structures.…”

Section: Introductionmentioning

confidence: 99%

Optical Simulations of Self-assembly Relevant Gold Aggregates: A Comparative Study

Zámbó

Deák

2016

Period. Polytech. Chem. Eng.

View full text Add to dashboard Cite

In this study, visible light extinction spectra of different gold nanoparticle assemblies were simulated using boundary element method (BEM) IntroductionGold nanoparticles feature strong extinction in the visible wavelength range due to the evolution of localized surface plasmon resonance (LSPR) upon interaction with visible light, which can be exploited in the field of sensing [1-3], catalysis [4,5], and biomedical applications [6,7]. Since the LSPR of gold nanoparticles manifests itself in a pronounced extinction peak in the visible, it can be conveniently investigated using ensemble spectroscopy techniques. The optical response of the particles on the other hand is tunable: the peak position of LSPR is sensitive to the size [8] and shape [9, 10] as well. Organizing the individual gold building blocks into self-assembled structures can open route towards new properties and applications [11]. In the self-assembly processes, 1D-chains (or small oligomers), 2D-arrays or 3D-compact nanoparticle clusters [12] are most commonly obtained. These nanostructures enable tuning of the optical response [13][14][15] for new type of applications, such as colorimetric assays [16] or based on SERS enhancement [17]. The clustering of the particles and the evolution of the different assemblies can be followed by UV-Vis spectroscopy. There are several literature examples, where assignment of the evolved nanoparticle cluster structure has been carried out solely based on spectroscopic characterization (or by naked eye due to the color change) and the identification of dimers, trimers [13], chains [18,19] or larger clusters [15] based on the extinction spectra has been claimed. Two-dimensional nanoparticle arrays have been also reported with potentially useful optical properties due to the collective plasmonic oscillations [20,21].Besides the structure or size [22] of the particle cluster, the interparticle distance between the building blocks [21,23] has also a profound effect on the evolving coupled mode. It has to be emphasized that in a real experiment -independently of the resulting structure -the clustering process usually generates a distribution of structures. Consequently, a multitude of coupled modes can exist simultaneously that can be excited by the external source. However, the overall optical response of the system is determined by the optically dominant centers [19], which is responsible e.g. for the presence of a 'distinct' coupled mode in the extinction spectrum during the aggregation of gold

show abstract

Tailoring Plasmon Coupling in Self-Assembled One-Dimensional Au Nanoparticle Chains through Simultaneous Control of Size and Gap Separation

Cited by 96 publications

References 46 publications

Plasmonic polymers unraveled through single particle spectroscopy

Plasmonic polymers unraveled through single particle spectroscopy

Coupled-Mode Theory and Its Applications on Computational Nanophotonics

Optical Simulations of Self-assembly Relevant Gold Aggregates: A Comparative Study

Contact Info

Product

Resources

About