Plasmonic Coupling in Gold Nanoring Dimers: Observation of Coupled Bonding Mode

Tsai, Chia Yang; Lin, Jyun Wei; Wu, Che Yao; Lin, Pin Tso; Lu, Tsan-Wen; Lee, Po Tsung

doi:10.1021/nl300012m

Cited by 173 publications

(142 citation statements)

References 44 publications

(60 reference statements)

Supporting

Mentioning

125

Contrasting

Unclassified

Order By: Relevance

“…1(b) displays a great resemblance with the results presented in Ref. 15 for an isolated dimer. Therefore, we can state that the observed extinction peak correspond to the excitation of the coupled-bonded mode of nanoring dimers extended over the whole lattice.…”

supporting

confidence: 79%

“…If the nanorings are thin, the LSPR displays a pure electric behavior which gives rise to a strong enhancement of the electric field in the gap (coupled-bonding mode). 15 However, when the height of the nanorings is increased so that it is much larger than the spacing between them, a VCL appears between the nanorings which provides a strong magnetic field concentration in the gap, giving rise to a magnetic hot-spot. In fact, our results show that the LSPR changes from a electric to a magnetic character for sufficiently thick nanorings and find than there is an optimum thickness that maximizes the magnetic field enhancement in about two orders of magnitude.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

et al. 2013

View full text Add to dashboard Cite

Light-interaction at optical frequencies is mostly mediated by the electric component of the electromagnetic field, being the response to the magnetic component usually negligible.Recently, it has be shown that properly engineered metallic nanoparticles can provide a magnetic response at optical frequencies originated from real or virtual flows of electric current in the structure. In this work, we demonstrate a new plasmonic mode which emerges from the strong coupling of high-aspect ratio gold nanorings. The resonance changes its character from electric to magnetic when increasing the height of the nanorings, giving rise to magnetic plasmons. Numerical simulations show that a virtual current loop appears at resonance for

show abstract

supporting

confidence: 79%

mentioning

confidence: 99%

Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

et al. 2013

View full text Add to dashboard Cite

show abstract

“…NR production through porous template is straightforward whereas structure lacks uniformity, including ring width, diameter and thickness. 11 Recent study focuses on top-down techniques that form NRs in a sacrificial layer (resist layer) using lift-off processes, such as electron beam lithography, 4,6,12 phase shift mask 13 and deep ultraviolet lithography 9 (upper, Fig. 1(a)).…”

mentioning

confidence: 99%

Large-scale production of ferromagnetic nanorings by a modified hole-mask colloidal lithography: Controlled creation of flux-closure vortex state

Lin

Hsu

2016

AIP Advances

View full text Add to dashboard Cite

show abstract

“…This phenomenon makes it possible, e.g., to measure length of a sub-100-nm macromolecule with gold nanoparticles bound to its ends by measuring the SPR position and comparing it to one of the uncoupled nanoparticles 4 . Tailorable nature of SPR allows flexible tuning of plasmonic dimer optical properties by changing the shape, mutual arrangement, or polarization of the incoming light and, hence, the type of the resonance [7][8][9] . In plasmon rulers, however, the maximum measurable distance is still limited to roughly 100 nm.…”

mentioning

confidence: 99%

Plasmon ruler with gold nanorod dimers: utilizing the second-order resonance

Shcherbakov

Dubrovina

et al. 2015

Opt. Lett.

View full text Add to dashboard Cite

The idea of utilizing the second-order plasmon resonance of the gold nanorod π-dimers for plasmon rulers is introduced. We report on a qualitatively different dependence of the plasmon resonance shift on the interparticle distance for the first-and second-order longitudinal modes, extending the working range of plasmon rulers up to the distance values of 400 nm.PACS numbers: 36.40. Gk, 73.20.Mf, 78.67.Bf, 78.20.Ci Optical properties of gold nanoparticles have contributed to many areas of science and technology, such as drug delivery 1 , cell imaging 2 , photothermal therapy 3 and others. In particular, a possibility of measuring nanoscale length utilizing pairs of gold nanoparticles-i.e., plasmonic dimers-was demonstrated 4,5 producing the idea of so-called plasmon ruler. Operating principles of plasmon rulers are based on the fact that the spectral position of the surface plasmon resonance (SPR) of a plasmonic dimer strongly depends on the distance between the particles forming the dimer 6 . This phenomenon makes it possible, e.g., to measure length of a sub-100-nm macromolecule with gold nanoparticles bound to its ends by measuring the SPR position and comparing it to one of the uncoupled nanoparticles 4 . Tailorable nature of SPR allows flexible tuning of plasmonic dimer optical properties by changing the shape, mutual arrangement, or polarization of the incoming light and, hence, the type of the resonance 7-9 . In plasmon rulers, however, the maximum measurable distance is still limited to roughly 100 nm.Nanorods are one of the frequently used shapes to analyze the physics behind the near-field coupling of plasmonic nanoparticles 10 . One distinguishes between two types of nanorod dimers-the so-called π-dimer and σ-dimer, referring to the analogy from the orientation of coupled atom p-orbitals. Providing subwavelength field localization in the gap between the inline arranged nanoparticles, the σ-dimer is used in nanoantenna research 11 and applications, such as improved surfaceenhanced Raman scattering 12 . The π-dimer, on the other hand, is a system conventionally considered for observation of optical magnetism happening when the freeelectron currents are out of phase in the nanorods forming the dimer 13 . Finally, for nanorods long enough it is possible to excite several longitudinal SPR modes 14 . Nevertheless considered theoretically 15,16 , the coupling properties of the higher-order resonances were neither provided experimentally so far, nor were they considered as a basis for a qualitatively different plasmon ruler-type a) Electronic mail: fedyanin@nanolab.phys.msu.ru system.In this contribution, we obtain the dependence of the SPR position λ 0 on the distance between the rods d for a set of π-dimers by means of microspectroscopy of gold nanorod samples and corresponding numerical calculations. The first-and second-order longitudinal dipolar plasmon resonances are considered. It is shown that one can use the λ 0 (d) dependence for the second-order resonance to form a plasmon ruler with working dist...

show abstract

Plasmonic Coupling in Gold Nanoring Dimers: Observation of Coupled Bonding Mode

Cited by 173 publications

References 44 publications

Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

Large-scale production of ferromagnetic nanorings by a modified hole-mask colloidal lithography: Controlled creation of flux-closure vortex state

Plasmon ruler with gold nanorod dimers: utilizing the second-order resonance

Contact Info

Product

Resources

About