Surface-enhanced Raman scattering on periodic metal nanotips with tunable sharpness

Linn, Nicholas C.; Sun, Chih-Hung; Arya, Ajay Kumar; Jiang, Peng; Jiang, Bin

doi:10.1088/0957-4484/20/22/225303

Cited by 53 publications

(62 citation statements)

References 44 publications

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“…[2] The effectiveness of these sensors relies on two key aspects: the strong and selective binding of analyte to the sensor surface and the sensitivity of the optical response of the SP systems to changes in the local dielectric environment resulting from those binding events. As nanofabrication technologies have advanced, SP-based phenomena on nanostructured metal surfaces have been actively studied, [3][4][5][6][7][8][9][10] and the resolution limit has been constantly improved, to the point where sub-monolayer binding events can be detected. [11] A major limitation of these SP sensors is due to the lossy nature of their resonance modes, which results from strong absorption of light by the metal nanostructures themselves.…”

Section: Introductionmentioning

confidence: 99%

High Quality Factor Metallodielectric Hybrid Plasmonic–Photonic Crystals

Shi

Han

et al. 2010

Adv Funct Materials

156

133

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A 2D polystyrene colloidal crystal self‐assembled on a flat gold surface supports multiple photonic and plasmonic propagating resonance modes. For both classes of modes, the quality factors can exceed 100, higher than the quality factor of surface plasmons (SP) at a polymer–gold interface. The spatial energy distribution of those resonance modes are carefully studied by measuring the optical response of the hybrid plasmonic–photonic crystal after coating with dielectric materials under different coating profiles. Computer simulations with results closely matching those of experiments provide a clear picture of the field distribution of each resonance mode. For the SP modes, there is strong confinement of electromagnetic energy near the metal surface, while for optical modes, the field is confined inside the spherical particles, far away from the metal. Coating of dielectric material on the crystal results in a large shift in optical features. A surface sensor based on the hybrid plasmonic–photonic crystal is proposed, and it is shown to have atomic layer sensitivity. An example of ethanol vapor sensing based on physisorption of ethanol onto the sensor surface is demonstrated.

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Section: Introductionmentioning

confidence: 99%

High Quality Factor Metallodielectric Hybrid Plasmonic–Photonic Crystals

Shi

Han

et al. 2010

Adv Funct Materials

156

133

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“…[17][18][19][20][21] We have developed a scalable bottom-up technique for generating wafer-sized periodic gold nanopyramids with nanoscale tips as an efficient surface-enhanced Raman scattering substrate. [22][23][24] Here we demonstrate that the templated nanopyramids can also be utilized as sensitive SPR sensors for chemical and biological sensing. Finitedifference time-domain ͑FDTD͒ simulation has been conducted to complement the optical measurements.…”

mentioning

confidence: 77%

Nanopyramid surface plasmon resonance sensors

Chung

Lin

Schultz

et al. 2010

Applied Physics Letters

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We report the achievement of sensitive chemical and biological sensing using periodic gold nanopyramids with nanoscale sharp tips created by a simple and scalable colloidal templating approach. The sharp tips and the long-range periodic structure of the nanopyramid arrays enable the excitement of both localized and propagating surface plasmons. The optical reflection and the detection sensitivity of the templated nanopyramid surface plasmon resonance sensors agree reasonably well with the theoretical predictions using a finite-difference time-domain model. We have also demonstrated that specific antigen-antibody binding can be detected by using nanopyramid arrays in a real-time and label-free manner. © 2010 American Institute of Physics. ͓doi:10.1063/1.3460273͔Surface plasmon resonance ͑SPR͒ technique is of great importance for monitoring binding events in biological systems because it offers a direct and label-free platform for rapid screening test.1-7 Surface plasmons ͑SPs͒ are electromagnetic waves that propagate along a metal/dielectric interface and can be pictured as a traveling charge density wave on the surface of a metal. 8,9 The coupling of incident light with free electrons in metal forms SP waves that are essentially confined to the metal/dielectric interface, leading to a strong concentration of electromagnetic field. The adsorption of molecules to a metal surface significantly changes the oscillation of SPs, resulting in the modulation of light output. The modulation could be monitored by the angular distributions of reflection and transmission, wavelength, intensity, phase, and polarization changes. 1,10 Compared to other immunoassays, such as enzyme-linked immunosorbent assay and radioimmunoassay, 11 the SPR technique is highly promising for rapid and sensitive biosensing because the label-free and real-time characteristics of SPR sensors shorten the sample preparation time, minimize the interference of conjugating radioactive or enzyme labels, and enable direct analyte detection without a sandwich format. 1,2,12 To generate SPs, the difference in the momentum of incident light and SP must be compensated. 9 In the traditional Kretschmann configuration of the attenuated total reflection method, a prism is used to couple the incident light to SPs.10 However, the bulky experimental setup impedes miniaturization and integration in microfluidic systems. 13 The exploitation of localized SPR ͑LSPR͒ around metal nanoparticles is favorable for developing planar on-chip-based sensors.14-16 However, the stochastic separation between neighboring nanoparticles that significantly affects LSPR impedes the sensing reproducibility. Periodically patterned nanostructures, which support both localized and propagating SPR, therefore draw great attention due to their high reproducibility. [17][18][19][20][21] We have developed a scalable bottom-up technique for generating wafer-sized periodic gold nanopyramids with nanoscale tips as an efficient surface-enhanced Raman scattering substrate. [22][23][24] Here we demonst...

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“…Linn's study showed that the arrays of nanotips structure could significantly enhance the local electromagnetic field and the sharpness of nanotips greatly affected the Raman enhancement. 13 Wu's report also demonstrated that in addition to the small gaps, the sharp tips of the conical structures showed strong Raman enhancement. 14 On the other hand, the angle resolved enhanced Raman scattering via different nanostructures was also studied in the literatures.…”

Section: Introductionmentioning

confidence: 94%

“…Such structures are capable of inducing very strong localized electric fields. 13,14,17 The localization of electric field is tighter for the tips structures due to the "hot spots" occupied at a smaller area compared to the blunter structures. Then, all tips of the protuberant Cu lines result in higher enhancement and the maximal enhancement factor reaches a plateau with an incident angle of 45…”

Section: -3 Huangmentioning

confidence: 99%

Enhancement of Raman signals from low-k dielectrics with angle-resolved light scattering on nanostructure patterned Cu/low-k interconnects of IC devices

Huang

Liu

Tan

et al. 2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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This letter reports the enhancement of Raman signals from low-k dielectric materials in the Cu/low-k interconnects of nanoscale integrated circuit (IC) devices. The Cu nanostructure pattern of the IC device acted as an active substrate for light scattering by the surface plasmon effect, enhancing the Raman signals observed from the low-k dielectric material of the device. The enhancement of the Raman signal of the low-k material was found to be strongly dependent on the incident angle of the incident laser light. A maximally enhanced Raman intensity was achieved when this angle was approximately 45° relative to the surface normal. Our findings are significant to the characterization of low-k materials and the monitoring of low-k reliability in leading edge semiconductor technologies with nanometer-scale structures.

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Surface-enhanced Raman scattering on periodic metal nanotips with tunable sharpness

Cited by 53 publications

References 44 publications

High Quality Factor Metallodielectric Hybrid Plasmonic–Photonic Crystals

High Quality Factor Metallodielectric Hybrid Plasmonic–Photonic Crystals

Nanopyramid surface plasmon resonance sensors

Enhancement of Raman signals from low-k dielectrics with angle-resolved light scattering on nanostructure patterned Cu/low-k interconnects of IC devices

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