How To Light Special Hot Spots in Multiparticle–Film Configurations

Chen, Shu; Meng, Lingyan; Shan, Hangyong; Li, Jianfeng; Qian, Lihua; Williams, Christopher T.; Yang, Zhilin; Zhang, Tian

doi:10.1021/acsnano.5b05605

Cited by 86 publications

(76 citation statements)

References 43 publications

(116 reference statements)

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“…Surface plasmon polaritons (SPPs) and local ized surface plasmons (LSPs) have been used to enhance the electric field, and excite higher electric and magnetic modes, leading to a series of fantastic optical phenomena and applications, [49][50][51][52] such as the surfaceenhanced Raman spectroscopy, [53] extraordinary optical transmission, [54] tip enhanced Raman spectroscopy, [55] and enhanced fluorescence spectroscopy. [56] With the development of nanotechnology, a deeper insight of SPs was further revealed, stimulating lots of active research fields, such as the quantum plasmonics, [57] graphene plasmonics, [58] Fano resonance, [59] and nonlinear nanooptics.…”

Section: Plasmonic Chiral Metamoleculesmentioning

confidence: 99%

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

162

122

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(circular birefringence) and absorption losses (circular dichroism) with the circu larly polarized light (CPL) illumination. [10] CB arises from the difference in the real part of refractive index, leading to a dif ferent velocity for LCP and RCP compo nents, and thus results in the polarization rotation of the linearly polarized incident light. CD corresponds to the difference in the imaginary part of refractive index, resulting in a distinct absorption loss for LCP and RCP excitations. Besides the con ventional CD and CB, asymmetric trans mission (circular conversion dichroism) is another fundamental chiroptical pheno menon, which exists in the nondiffracting array, referring to different LCPtoRCP and RCPtoLCP conversion efficiencies. [11] All of these chiroptical phenomena have been successfully applied in the spectros copy for identifying special arrangements of chiral matters in biology, chemistry and physics as efficient diagnostic tools. [12][13][14][15][16] However, the chirop tical response in natural chiral materials is relatively weak due to the small electromagnetic (EM) interaction volume, [17] hence limits its further applications.Recent progress in plasmonics paves the way for the enhancement of chiroptical response. [18][19][20] Surface plasmons (SPs), as the collective electrons oscillation at the dielectric and metal interface, [21][22][23] present the capacity of light confine ment and field enhancement, which significantly improve the strength of lightmatter interactions. [24][25][26][27][28] With the uptodate nanofabrication technology, the study field of chirality has been extended from traditional chiral molecules to 3D metallic nanostructures. [29][30][31][32] Chiroptical responses of metallic meta molecules have been widely investigated, [33][34][35] and applied in various fields, such as biosensing, [36] chiral catalysis, [37] polari zation tuning, [38] and chiral photo detection.[39] The 3D metallic structure exhibited giant optical activity response because of the strong interaction between electric and magnetic resonant modes. [40,41] Different from 3D chiral ensembles, planar chiral structures show none chiral effect, as they can always coincide with their mirror images. However, 2D chirality was successfully found in the quasitwodimensional (quasi2D) chiral structure. [42] Moreover, recent reports show that even achiral nanomaterials have the ability to generate strong CD under an oblique CPL illumination. [43] This kind of extrinsic chirality arises from sym metry breaking of the incident light and the quasi2D material, which is quite different from the intrinsic chirality of 3D chiral The plasmonic chiroptical effect has been used to manipulate chiral states of light, where the strong field enhancement and light localization in metallic nanostructures can amplify the chiroptical response. Moreover, in metamaterials, the chiroptical effect leads to circular dichroism (CD), circular birefringence (CB), and asymmetric transmission. Potential applications enabled by chiral plasmonics...

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Section: Plasmonic Chiral Metamoleculesmentioning

confidence: 99%

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

162

122

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“…[ 115 ] There were four distinct plasmonic modes at 525, 580, 645, and 850 nm in the scattering spectrum for the dimer of Au@SiO 2 SHINs on a smooth gold fi lm under the chargerconjugate image and near-fi eld coupling effect ( Figure 4 A,B). [ 115 ] There were four distinct plasmonic modes at 525, 580, 645, and 850 nm in the scattering spectrum for the dimer of Au@SiO 2 SHINs on a smooth gold fi lm under the chargerconjugate image and near-fi eld coupling effect ( Figure 4 A,B).…”

Section: Progress Reportmentioning

confidence: 98%

“…To employ SHINERS technique, it is essential to understand the following parameters: fi rst, the metallic nanoparticle core should be SERS-active with an appropriate size. For example, the shell material of SHINs can be TiO 2 ( [ 115 ] Copyright 2016, American Chemical Society. Shell-isolated gold nanocubes and nanorods (Figure 6 C,D) were synthesised as their maximum SPR peak can be simply tuned by adjusting the aspect ratio.…”

Section: Progress Reportmentioning

confidence: 99%

Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy at Single‐Crystal Electrode Surfaces

Dong

Panneerselvam

Lin

et al. 2016

Advanced Optical Materials

Self Cite

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As an innovative technique, shell‐isolated nanoparticle‐enhanced Raman spectroscopy (SHINERS) eliminates the material and morphology generality problems of surface‐enhanced Raman spectroscopy (SERS). For the past few years, SHINERS has been extensively employed in many fields, especially in the electrochemistry field. This article renders a brief overview of the developments of SHINERS technique and its applications in electrochemistry. First, we clearly explain the basic principles of the SHINERS technique, such as design principles, materials synthesis, characterization methods, and related theoretical calculation methods. We then describe about the significant applications of electrochemical SHINERS (EC‐SHINERS) with a focus of study on various single‐crystal electrode surfaces. Finally, we summarize the recent developments and give an outlook for future developments in the SHINERS field.

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“…It is consistent with the assumption by comparing the extent of reduction in the absolute SERS intensity aer encapsulation of silica shells, and the conclusion also agrees well with the result reported by Chen et al through theoretical simulations. 46 Therefore, it is reasonable to assume that the suitable wavelength for the two gap modes can be determined from the absolute and relative (I beyond /I on ) SERS intensities in our present case.…”

Section: 43mentioning

confidence: 99%

Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO₂monolayer film and gold single crystal plates

Wei

Zhang

et al. 2017

RSC Adv.

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Plasmonic hot spots, capable of confining strong electromagnetic fields near metallic surfaces, are particularly essential to a variety of enhanced spectroscopic techniques. Understanding the electric field distributions in the hot spot plays a crucial role in controlling the fabrication of plasmonic nanostructures for a variety of plasmon-based applications. The investigation of plasmonic hot spots in metallic nanosystems has not been fully evaluated. Here, we develop a facile approach by experimental means for investigating the distribution of plasmonic hot spots in surface-enhanced Raman spectroscopy (SERS) based on the dual-probe strategy by coupling a p-mercaptobenzoic acid-embedded Au@SiO 2 ((AupMBA)@SiO 2 ) nanoparticle monolayer film with thiophenol-modified gold single crystal plates (TPGSCPs). We demonstrated, for the first time, the heterogeneous distribution of SERS effect in the gap between Au@SiO 2 monolayer film and GSCPs. As increasing the gap distance by changing the thickness of silica spacer, the SERS effect of the probe on the gold nanoparticles decayed with a slower rate than that of the other probe attached onto the GSCPs. It mainly originated from the difference of localized dielectric environments and curvatures. By deliberately controlling the silica shell thickness, the switchable plasmonic coupling effect can be achieved between "particle-particle" gap mode and "particle-surface" gap mode. The results reveal that the transfer effect is more evident for (Au-pMBA) @SiO 2 films with thinner silica shell thickness and for 785 nm illumination as excitation wavelength than 633 nm. Moreover, the introduction of NaOH solution to (Au-pMBA)@SiO 2 films leads to the transfer of the hot spots to the areas between neighboring nanoparticles again due to the removal and dissolution of silica shells. The understanding gained from our experimental observation provides keen insight into the plasmonic hot spots in coupled nanostructures, offering guidance for rational design of plasmonic substrates for ultrasensitive SERS detections.

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How To Light Special Hot Spots in Multiparticle–Film Configurations

Cited by 86 publications

References 43 publications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy at Single‐Crystal Electrode Surfaces

Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO₂monolayer film and gold single crystal plates

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How To Light Special Hot Spots in Multiparticle–Film Configurations

Cited by 86 publications

References 43 publications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy at Single‐Crystal Electrode Surfaces

Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO2monolayer film and gold single crystal plates

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Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO₂monolayer film and gold single crystal plates