Quadrupole-Enhanced Raman Scattering

Hastings, Simon P.; Swanglap, Pattanawit; Qian, Zhaoxia; Fang, Ying; Park, Soo‐Young; Link, Stephan; Engheta, Nader; Fakhraai, Zahra

doi:10.1021/nn5022346

Cited by 44 publications

(76 citation statements)

References 36 publications

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“…It has been recently demonstrated that the disorder in these nanoshells generates spectrally and spatially broad dark quadrupole modes that enable highly efficient and reproducible Quadrupole Enhanced Raman Scattering(QERS) on a single particle level [33]. Here we demonstrate that single particle far-field backscattering measurements of these nanoshells show interference patterns [33]. Tmatrix calculations allow us to investigate the origin of these interferences.…”

Section: Introductionmentioning

confidence: 69%

“…As described in our previous publications [30][31][32][33], spiky nanoshells were produced using a surfactant-assisted seed growth method. The nanoshells used in this study have a polystyrene core with a diameter of 95 nm, with spikes estimated to be less than 68 nm in length.…”

Section: Synthesis and Dark Field Microscopymentioning

confidence: 99%

“…Nanoshells were drop cast onto clean glass slides with an evaporated indexed gold pattern and characterized for single particle backscattering measurements as described in detail in our previous publication [33]. In order to perform single particle surface enhanced Raman spectroscopy (SERS) experiments, as described previously [33], the spiky nanoshells were immersed in a solution of 4-mercaptobenzoic acid (0.0002 g/ml) over night, cleaned with ethanol, and allowed to dry under nitrogen. The combination of backscattering and SEM imaging at low magnification were performed to ensure that only single particle spectra are reported.…”

Section: Synthesis and Dark Field Microscopymentioning

confidence: 99%

“…FDTD simulations were performed using Lumerical Solutions inc.'s FDTD package (versions 8.6 and 8.7) as previously described [31][32][33]. The simulation boundary conditions were set to Perfectly Matched Layers (PML), and a Total-Field Scattered-Field (TFSF) source was used to inject a plane wave into the simulation.…”

Section: Finite Difference Time Domain (Fdtd) Simulationsmentioning

confidence: 99%

“…Spiky nanoshells are composed of randomly sized sharp gold spikes decorating the surface of a polystyrene core [30], and have tunable dipolar resonances in the visible and near-IR range [30][31][32]. It has been recently demonstrated that the disorder in these nanoshells generates spectrally and spatially broad dark quadrupole modes that enable highly efficient and reproducible Quadrupole Enhanced Raman Scattering(QERS) on a single particle level [33]. Here we demonstrate that single particle far-field backscattering measurements of these nanoshells show interference patterns [33].…”

Section: Introductionmentioning

confidence: 99%

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Modal interference in spiky nanoshells

Hastings¹,

Qian²,

Swanglap³

et al. 2015

Opt. Express

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Near-field enhancement of the electric field by metallic nanostructures is important in non-linear optical applications such as surface enhanced Raman scattering. One approach to producing strong localization of the electric field is to couple a dark, non-radiating plasmonic mode with a broad dipolar resonator that is detectable in the far-field. However, characterizing or predicting the degree of the coupling between these modes for a complicated nanostructure can be quite challenging. Here we develop a robust method to solve the T-matrix, the matrix that predicts the scattered electric fields of the incident light, based on finite-difference time-domain (FDTD) simulations and least square fitting algorithms. This method allows us to simultaneously calculate the T-matrix for a broad spectral range. Using this method, the coupling between the electric dipole and quadrupole modes of spiky nanoshells is evaluated. It is shown that the built-in disorder in the structure of these nanoshells allows for coupling between the dipole modes of various orientations as well as coupling between the dipole and the quadrupole modes. A coupling strength of about 5% between these modes can explain the apparent interference features observed in the single particle scattering spectrum. This effect is experimentally verified by single particle backscattering measurements of spiky nanoshells. The modal interference in disordered spiky nanoshells can explain the origin of the spectrally broad quadrupole resonances that result in strong Quadrupole Enhanced Raman Scattering (QERS) in these nanoparticles.

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Section: Introductionmentioning

confidence: 69%

Section: Synthesis and Dark Field Microscopymentioning

confidence: 99%

Section: Synthesis and Dark Field Microscopymentioning

confidence: 99%

Section: Finite Difference Time Domain (Fdtd) Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modal interference in spiky nanoshells

Hastings¹,

Qian²,

Swanglap³

et al. 2015

Opt. Express

Self Cite

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Controlled Assembly of Plasmonic Nanoparticles: From Static to Dynamic Nanostructures

et al. 2021

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The spatial arrangement of plasmonic nanoparticles can dramatically affect their interaction with electromagnetic waves, which offers an effective approach to systematically control their optical properties and manifest new phenomena. To this end, significant efforts were made to develop methodologies by which the assembly structure of metal nanoparticles can be controlled with high precision. Herein, recent advances in bottom-up chemical strategies toward the well-controlled assembly of plasmonic nanoparticles, including multicomponent and multifunctional systems are reviewed. Further, it is discussed how the progress in this area has paved the way toward the construction of smart dynamic nanostructures capable of on-demand, reversible structural changes that alter their properties in a predictable and reproducible manner. Finally, this review provides insight into the challenges, future directions, and perspectives in the field of controlled plasmonic assemblies.

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Exact Multipolar Decompositions with Applications in Nanophotonics

Alaee

Rockstuhl

Fernandez‐Corbaton

2018

Advanced Optical Materials

117

102

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The multipolar decomposition of electromagnetic sources is an important tool for the study of light–matter interactions in general, and optical materials in particular. Here, a report is given on recent progress in the multipolar decomposition of electromagnetic sources. First, the exact and simple expressions for the multipolar moments of electric current density distributions are reviewed, and then, the results are extended to multipolar moments of magnetization current density distributions due to intrinsic spin. The consideration of both electric and magnetic sources allows to establish the conditions for sources of pure handedness. Scripts are provided that facilitate the computation of multipolar moments of arbitrary order. The work and the included examples of use are placed in the context of nanophotonics and metamaterials, and an outlook for applications in these and other fields is provided.

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Quadrupole-Enhanced Raman Scattering

Cited by 44 publications

References 36 publications

Modal interference in spiky nanoshells

Modal interference in spiky nanoshells

Controlled Assembly of Plasmonic Nanoparticles: From Static to Dynamic Nanostructures

Exact Multipolar Decompositions with Applications in Nanophotonics

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