Shedding light on dark plasmons in gold nanorings

Feng, Hao; Larsson, Elin; Ali, Tamer A.; Sutherland, Duncan S.; Nordlander, Peter

doi:10.1016/j.cplett.2008.04.126

Cited by 226 publications

(212 citation statements)

References 40 publications

Supporting

Mentioning

198

Contrasting

Order By: Relevance

“…To identify clearly the effect of non-normal incidence of light on the appearance of the l = 2 mode, we tilted the sample to various angles ͑30°, 45°, and 60°with an error of about Ϯ5°͒ between the substrate normal and the direction of the incident light in air, which corresponds to angles of 13°, 19°, and 23°in ZnS according to Snell's law. As known from literature, 15,17,18 dark modes appear for such configurations because the incident electrical field is no longer constant along the length of the nanoantenna and phase shifts occur over the full nanorod length. For increasing incident angle, the coupling between the incident radiation and the dark modes becomes more efficient ͑up to a certain angle depending on the surrounding medium͒ while coupling to bright modes is less efficient.…”

mentioning

confidence: 85%

“…Indeed, such behavior was observed in nanorods 14,15,17 and also in other metallic nanostructures. 18 In addition, dark modes are observed in spectroscopic studies of complex multimer structures. [19][20][21][22] In this paper we report on the appearance of dipole-forbidden second-order modes ͑l =2͒ in the IR spectra of some single gold nanorods under normal incident radiation and we identify the origin of this effect.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods

Neubrech

García‐Etxarri

Weber

et al. 2010

Applied Physics Letters

View full text Add to dashboard Cite

Optical anisotropy of GaSb type-II nanorods on vicinal (111)B GaAs Appl. Phys. Lett. 99, 231901 (2011) Microcavity effects in SiGe/Si heterogeneous nanostructures prepared by electrochemical anodization of SiGe/Si multiple quantum wells J. Appl. Phys. 110, 103101 (2011) Tailoring the Faraday effect by birefringence of two dimensional plasmonic nanorod array Appl. Phys. Lett. 99, 191107 (2011) Scattering analysis of plasmonic nanorod antennas: A novel numerically efficient computational scheme utilizing macro basis functions J. Appl. Phys. 109, 123109 (2011) Tunable photoluminescence and photoconductivity in ZnO one-dimensional nanostructures with a second belowgap beam

show abstract

mentioning

confidence: 85%

mentioning

confidence: 99%

Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods

Neubrech

García‐Etxarri

Weber

et al. 2010

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…20 The NR plasmonic properties can be seen as the electromagnetic interaction between the nanodisc and the nanohole plasmons. [21][22][23] This results in the splitting of the plasmon mode into two resonance modes, which are the low energy "bonding" mode and the high energy "antibonding" mode. The resonance frequencies of both resonance modes can be easily tuned in the visible ͑VIS͒ and NIR range by adjusting the geometry of NR, which is useful for various optical sensing applications.…”

mentioning

confidence: 99%

High sensitivity plasmonic index sensor using slablike gold nanoring arrays

Tsai¹,

Lu²,

Lin³

et al. 2011

Applied Physics Letters

123

View full text Add to dashboard Cite

We investigate the index sensing characteristics of plasmonic arrays based on square lattice slablike gold nanorings ͑NRs͒ with different ring widths. The gold NR arrays exhibit two extinction peaks in the visible and near-infrared corresponding to antibonding and bonding modes. Redshift and blueshift in antibonding and bonding modes when broadening the average ring width are observed. We experimentally demonstrate the sensitivity of bonding mode can be tuned by varying the average ring width. However, the sensing performance is limited because the enhanced fields concentrate inside the shell-like structures. The nanoring ͑NR͒ structure surmounts this limitation due to the extension of inside field to the environment. This leads to significant increase in the detection sensitivity. 20 The NR plasmonic properties can be seen as the electromagnetic interaction between the nanodisc and the nanohole plasmons. [21][22][23] This results in the splitting of the plasmon mode into two resonance modes, which are the low energy "bonding" mode and the high energy "antibonding" mode. The resonance frequencies of both resonance modes can be easily tuned in the visible ͑VIS͒ and NIR range by adjusting the geometry of NR, which is useful for various optical sensing applications.In this letter, we report our experimental investigation of bonding and antibonding modes in plasmonic arrays based on square lattice slablike gold NRs with different ring widths. The refractive index sensing experiments of such structures are performed by immersing the samples in index matching liquids. We show that the sensitivities of NR arrays exhibit a linear relationship with ring widths for the bonding mode in the NIR regime. These results are crucial in designing LSP resonance ͑LSPR͒ sensors based on periodic metallic nanostructures.The scheme of square lattice gold NR array with ring thickness t, periodicity p, diameter d, and average width w is shown in Fig. 1͑a͒. The periodicity, diameter, and thickness are fixed at 1 m, 500 nm, and 50 nm. In fabrication, the ITO glass is utilized as the substrate to avoid the charge accumulation effect during electron beam lithography ͑EBL͒. First, the ITO glass was spin-coated a 150 nm polymethylmethacrylate ͑PMMA͒ layer. The NR patterns with area of 300ϫ 300 m 2 and different ring widths were defined on the PMMA layer by EBL. After the development process, a gold thin film with thickness of 50 nm was deposited by thermal evaporation. Then the liftoff process is applied by rinsing the sample in acetone for a few hours. The periodicity p of array is 1 m, the ring diameter is 500 nm, and the ring thickness t is 50 nm.APPLIED PHYSICS LETTERS 98, 153108 ͑2011͒

show abstract

“…With fewer particles in the ring, the cumulative charge distributions of these electric dipoles resemble lower order electric multipolar ring modes (See Ref. [25] for examples of such charge distributions). As the number of particles increase, these charge distributions resemble higher order electric multipolar ring modes (i.e.…”

mentioning

confidence: 99%

Plasmonic Mode Engineering with Templated Self-Assembled Nanoclusters

et al. 2012

Self Cite

View full text Add to dashboard Cite

Plasmonic nanoparticle assemblies are a materials platform in which optical modes, resonant frequencies, and near-field intensities can be specified by the number and position of nanoparticles in a cluster. A current challenge is to achieve clusters with higher yields and new types of shapes. In this Letter, we show that a broad range of plasmonic nanoshell nanoclusters can be assembled onto a lithographically defined elastomeric substrate with relatively high yields using templated assembly. We assemble and measure the optical properties of three cluster types: Fano-resonant heptamers, linear chains, and rings of nanoparticles. The yield of heptamer clusters is measured to be over 30%. The assembly of plasmonic nanoclusters on an elastomer paves the way for new classes of plasmonic nanocircuits and colloidal metamaterials that can be transfer-printed onto various substrate media.

show abstract

Shedding light on dark plasmons in gold nanorings

Cited by 226 publications

References 40 publications

Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods

Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods

High sensitivity plasmonic index sensor using slablike gold nanoring arrays

Plasmonic Mode Engineering with Templated Self-Assembled Nanoclusters

Contact Info

Product

Resources

About