Surface-enhanced Raman scattering by composite structure of gold nanocube-PMMA-gold film

Wang, Xiangxian; Xi-Xiang, Bai; Pang, Zhiyong; Zhu, Jiankai; Wu, Yuan; Yang, Hua; Qi, Yunping; Wen, Xiaolei

doi:10.1364/ome.9.001872

Cited by 78 publications

(18 citation statements)

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“…Under the action of incident light, the collective oscillation of Au free electrons can enhance the local electromagnetic field on their surface [19]. Au nanoparticles have strong local electromagnetic field enhancement on the surface, which has been widely used in fields such as catalysis, photonics, sensing and surface enhanced Raman scattering (SERS) [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

et al. 2020

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In this article, we present a design for a triple-band tunable metamaterial absorber with an Au nano-cuboids array, and undertake numerical research about its optical properties and local electromagnetic field enhancement. The proposed structure is investigated by the finite-difference time domain (FDTD) method, and we find that it has triple-band tunable perfect absorption peaks in the near infrared band (1000–2500 nm). We investigate some of structure parameters that influence the fields of surface plasmons (SP) resonances of the nano array structure. By adjusting the relevant structural parameters, we can accomplish the regulation of the surface plasmons resonance (SPR) peaks. In addition, the triple-band resonant wavelength of the absorber has good operational angle-polarization-tolerance. We believe that the excellent properties of our designed absorber have promising applications in plasma-enhanced photovoltaic, optical absorption switching and infrared modulator optical communication.

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Section: Introductionmentioning

confidence: 99%

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

et al. 2020

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“…The motivations include: 1)There is a considerable amplification of the electromagnetic wave's electric field in the vicinity of the plasmon. This can be used to enhance fluorescence, nonlinear optical emission, upconversion, or a Raman emission 2)Propagation of the plasmon in the case of an SPP offers the prospect of signal processing and new types of optical devices …”

Section: Introductionmentioning

confidence: 99%

The Quest for Zero Loss: Unconventional Materials for Plasmonics

2019

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There has been an ongoing quest to optimize the materials used to build plasmonic devices: first the elements were investigated, then alloys and intermetallic compounds, later semiconductors were considered, and, most recently, there has been interest in using more exotic materials such as topological insulators and conducting oxides. The quality of the plasmon resonances in these materials is closely correlated with their structure and properties. In general gold and silver are the most commonly specified materials for these applications but they do have weaknesses. Here, it is shown how, in specific circumstances, the selection of certain other materials might be more useful. Candidate alternatives include TixN, VO2, Al, Cu, Al‐doped ZnO, and Cu–Al alloys. The relative merits of these choices and the many pitfalls and subtle problems that arise are discussed, and a frank perspective on the field is provided.

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“…Our calculations show that when the radius and gap of the trimer are 170 nm and 5 nm, intense localized electric near fields occur in the gap of the dielectric trimer, and the electric field enhancement at point A reaches a maximum of around 71 at the peak. The large field enhancement effect at the gap is an attractive property that can improve the Raman scattering signal of molecules effectively [47].…”

Section: Resultsmentioning

confidence: 99%

Dual-band directional scattering with all-dielectric trimer in the near-infrared region

et al. 2019

Appl. Opt.

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A silicon trimer is explored to tailor unidirectional forward scattering at multiple wavelengths in the near-infrared region with low loss using theoretical calculations and numerical simulations, which leads to the dramatic enhancement in unidirectional forward scattering and suppression of backward scattering. The higher moments in the trimer can be properly excited and balanced by breaking the symmetry of the trimer. The generalized Kerker conditions at two different wavelengths can be achieved in the trimer to further improve the scattering directivity. Our results provide insights into future development of all-dielectric low-loss nanoantennas in the near-infrared region.

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Surface-enhanced Raman scattering by composite structure of gold nanocube-PMMA-gold film

Cited by 78 publications

References 50 publications

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

The Quest for Zero Loss: Unconventional Materials for Plasmonics

Dual-band directional scattering with all-dielectric trimer in the near-infrared region

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