Surface-Enhanced Raman Scattering from Individual Au Nanoparticles on Au Films

Du, Chunling; Du, Chao-Jun; You, Yu‐Meng; He, CongJun; Luo, Jian; Shi, Dan

doi:10.1007/s11468-012-9331-y

Cited by 23 publications

(11 citation statements)

References 18 publications

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“…[11][12][13][14][15][16][17][18][19][20] Particularly, the system composed of metal NPs positioned over a continuum metallic film has received increasing attention. [20][21][22][23][24][25][26][27][28] In metal NP over the metal film (MNOMF) configuration, the NP couples with its mirror image in the metallic film, generating strongly enhanced EM fields localized at the junction between the NP and the metal film. 24,[29][30][31] The MNOMF can be fabricated using low-cost and simple methods over large areas by directly depositing the NPs on top of the metal film.…”

Section: Introductionmentioning

confidence: 99%

“…20,24,32 In addition, separation distance between the NP and the film can be well-tuned by adjusting the thickness of the dielectric spacer, resulting in both the well-tuned resonance position of the supported NP and the highly uniform and reproducible hot spots. [23][24][25][31][32][33][34][35][36] More importantly, MNOMF provides coupling in the vertical direction, for which uniformly distributed gaps between the NP and the film with sub-1 nm size can be fabricated. Such an extremely small gap is critical for generating extremely enhanced EM fields in coupled nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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Ultrahigh Enhancement of Electromagnetic Fields by Exciting Localized with Extended Surface Plasmons

Isaacs

Abdulhalim

et al. 2015

J. Phys. Chem. C

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Excitation of localized surface plasmons (LSPs) of metal nanoparticles (NPs)residing on a flat metal film has attracted great attentions recently due to the enhanced electromagnetic (EM) fields found to be higher than the case of NPs on a dielectric substrate. In the present work, it is shown that even much higher enhancement of EM fields is obtained by exciting the LSPs through extended surface plasmons (ESPs) generated at the metallic film surface using the Kretschmann-Raether configuration. We show that the largest EM field enhancement and the highest surface-enhanced fluorescence intensity are obtained when the incidence angle is the ESP resonance angle of the underlying metal film. The finite-difference time-domain simulations indicate that excitation of LSPs using ESPs can generate 1-3 orders higher EM field intensity than direct excitation of the LSPs using incidence from free space. The ultrahigh enhancement is attributed to the strong confinement of the ESP waves in the vertical direction. The drastically intensified EM fields are significant for highly-sensitive refractive index sensing, surface-enhanced spectroscopies, and enhancing the efficiency of optoelectronic devices.2 KEYWORDS: localized surface plasmon resonance, surface palsmon polariton, KretschmannRaether, metal nanoparticles, electromagnetic field enhancement, surface-enhanced spectroscopies 3

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrahigh Enhancement of Electromagnetic Fields by Exciting Localized with Extended Surface Plasmons

Isaacs

Abdulhalim

et al. 2015

J. Phys. Chem. C

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“…Metal nanoparticles (MNPs) with the behavior of surface plasmon polaritons (SPPs) and resonant couplings lead to EM wave confinement that can be applied in nanophotonic and optoelectronic fields [7][8][9][10][11][12]. Surface plasmon resonance (SPR) is an extraordinary phenomenon, which originates from coupling an EM wave with collective electron oscillations between the interface of an MNP and dielectric [13][14][15][16][17]. In the same manner, the gap plasmon resonance (GPR), cavity plasmon resonance (CPR) and lattice plasmon resonance (LPR) phenomena will be generated in composite MNP-dielectric nanostructures when the resonance modes are attributed to gaps, cavities and periodic nanostructure arrays, respectively [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Perfect Dual-Band Absorber Based on Plasmonic Effect with the Cross-Hair/Nanorod Combination

et al. 2020

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Plasmonic effect using a cross-hair can convey strongly localized surface plasmon modes among the separated composite nanostructures. Compared to its counterpart without the cross-hair, this characteristic has the remarkable merit of enhancing absorptance at resonance and can make the structure carry out a dual-band plasmonic perfect absorber (PPA). In this paper, we propose and design a novel dual-band PPA with a gathering of four metal-shell nanorods using a cross-hair operating at visible and near-infrared regions. Two absorptance peaks at 1050 nm and 750 nm with maximal absorptance of 99.59% and 99.89% for modes 1 and 2, respectively, are detected. High sensitivity of 1200 nm refractive unit (1/RIU), figure of merit of 26.67 and Q factor of 23.33 are acquired, which are very remarkable compared with the other PPAs. In addition, the absorptance in mode 1 is about nine times compared to its counterpart without the cross-hair. The proposed structure gives a novel inspiration for the design of a tunable dual-band PPA, which can be exploited for plasmonic sensor and other nanophotonic devices.

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“…121,122,[125][126][127][128] The accurate manipulation of the dielectric spacer thickness also enables the generation of highly uniform and reproducible gaps between the NP and the film, which is significant for highly sensitive and reproducible SES. 122,130,131 Moreover, MNOMF provides coupling in vertical direction. For two NPs coupled in lateral direction, it is a challenging task to obtain very small gaps between them.…”

Section: Coupled Nanostructures With Nanoscale Gapsmentioning

confidence: 99%

“…122,128,129,131 Due to the aforementioned advantages, MNOMF has been widely explored for highperformance SES. 65,125,[130][131][132][133][134][135] Previous studies showed that ~60 o incidence angle gives the largest electric field enhancement and the maximum SERS intensity for the MNOMF configuration, ascribing to the coherent superposition of the reflected field components and the incident field components (Figure 2-12). 125,136 In the past decades, the MNOMF has been extensively applied in SERS, plasmon-enhanced photoluminescence, and other techniques.…”

Section: Coupled Nanostructures With Nanoscale Gapsmentioning

confidence: 99%

Coupled noble metal nanostructures for high-performance surface-enhanced spectroscopies

Li¹

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This chapter gives a brief introduction to the whole thesis. Following a concise overview of previous researches, the problems existed in previous studies and the three hypotheses made in this work are stated. Then the objectives and scopes, the outline of this thesis, and the main findings and the significances of this work are listed. (3) To investigate the effects of the SPPs of the underlying metal film on the hot spots in MNOMF. To optimize the electric field enhancement in MNOMF for high-performance SES. 1.3 Dissertation overview The thesis consists of 7 chapters. Chapter 1 is the introduction, including the problem statement, hypotheses, research objectives and scopes, the dissertation overview, and the findings and significances. Chapter 2 gives a comprehensive literature review, including the SPRs of noble metal nanostructures, SES, noble metal nanostructures with hot spots, and methods to optimize the hot spots in metallic nanostructures for high-performance SES. Following the literature review, the research gaps are listed and the PhD in context of literature is provided. Chapter 3 introduces the theoretical method used in this study, including the introduction of Maxwell's curl equations and the finite-difference time-domain (FDTD) method. Chapter 4 investigates the hot spots in Au SNPDs. The influences of the SNPD configurations, the spherical core diameters, the hollow nanoshell core, and the polarization angle on the hot spots in Au SNPDs are studied. A methodology to achieve both huge "hot spots volume" and high electric field intensity in dimers is proposed. Chapter 5 investigates the optical properties of Au crossed T-T SDDs. The "hot spots volume" and electric field enhancement in crossed T-T SDD are compared with those in disk dimer. The effects of glass substrate, disk diameter, tip width, tip length, structure thickness, gap size between two crossed tips, the longitudinal overlap distance between two crossed tips, and the polarization direction on the hot spots in crossed T-T SDDs are comprehensively investigated.

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Surface-Enhanced Raman Scattering from Individual Au Nanoparticles on Au Films

Cited by 23 publications

References 18 publications

Ultrahigh Enhancement of Electromagnetic Fields by Exciting Localized with Extended Surface Plasmons

Ultrahigh Enhancement of Electromagnetic Fields by Exciting Localized with Extended Surface Plasmons

Perfect Dual-Band Absorber Based on Plasmonic Effect with the Cross-Hair/Nanorod Combination

Coupled noble metal nanostructures for high-performance surface-enhanced spectroscopies

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