Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

Lorente-Crespo, M.; Wang, Li; Ortuño, Rubén; García-Meca, Carlos; Ekinci, Yasin; Martı́nez, Alejandro

doi:10.1021/nl400798s

Cited by 53 publications

(51 citation statements)

References 32 publications

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“…The SDS was purchased from Tianli Reagents Ltd, Tianjin, China. The PEG (average Mn = 20 000) and hydrogen tetrachloroauric acid (HAuCl 4 • 4H 2 O, ⩾ 99.9%) were purchased from Shanghai Aladdin Biological Technology Ltd. The water used was highly purified with resistivity ⩾ 18.0 MΩ • cm.…”

Section: Materials and Methods Materialsmentioning

confidence: 99%

“…1 Among the wide variety of NPs with diverse shapes, 'toroidal/ring' NPs, as artificial complex nanostructures with ring cavities, are of particular interest because they exhibit novel and unique properties in sensing, 2 magnetic configuration, 3 optical response 4 and plasmonic behavior. 5 In particular, Au or Ag nanostructures with toroidal shapes (nanorings) exhibit near infrared resonances that are not observed in similar disk-like particles without holes.…”

Section: Introductionmentioning

confidence: 99%

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Gold nanorings synthesized via a stress-driven collapse and etching mechanism

Fang

Tian

et al. 2016

NPG Asia Mater

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Toroidal Au or Ag nanostructures are of particular interest due to their unique optical responses and superior catalytic applications. However, the fabrication of ring-like Au or Ag nanostructures is limited to either electron beam lithography or template techniques, thus hampering their applications. Here, we present a new stress-driven structure collapse and etching mechanism to synthesize Au nanorings via a direct one-pot solution-based chemical reaction. The nanoparticle-mediated recrystallization process contributes to the formation of Au nanoframes, which contain unusual stress, thus promoting the breakup of the nanoframes and finally converting them into Au nanorings. The Au nanorings with tunable hole sizes exhibit interesting localized surface plasmon features owing to the coupling of bonding and antibonding modes on the inner and outer surfaces of the nanorings. This facile approach may open the door for the preparation of toroidal nanostructures in other compositions for numerous applications.

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Section: Materials and Methods Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gold nanorings synthesized via a stress-driven collapse and etching mechanism

Fang

Tian

et al. 2016

NPG Asia Mater

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“…nanostructures provide strong confinement of the electric [101] and even magnetic field [102] in deep subwavelength regions via excitation of localized surface plasmon resonances. Interestingly, they also exhibit vibrational resonances in the GHz regime [103].…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Modeling light-sound interaction in nanoscale cavities and waveguides

et al. 2014

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Abstract:The interaction of light and sound waves at the micro and nanoscale has attracted considerable interest in recent years. The main reason is that this interaction is responsible for a wide variety of intriguing physical phenomena, ranging from the laser-induced cooling of a micromechanical resonator down to its ground state to the management of the speed of guided light pulses by exciting sound waves. A common feature of all these phenomena is the feasibility to tightly confine photons and phonons of similar wavelengths in a very small volume. Amongst the different structures that enable such confinement, optomechanical or phoxonic crystals, which are periodic structures displaying forbidden frequency band gaps for light and sound waves, have revealed themselves as the most appropriate candidates to host nanoscale structures where the light-sound interaction can be boosted. In this review, we describe the theoretical tools that allow the modeling of the interaction between photons and acoustic phonons in nanoscale structures, namely cavities and waveguides, with special emphasis in phoxonic crystal structures. First, we start by summarizing the different optomechanical or phoxonic crystal structures proposed so far and discuss their main advantages and limitations. Then, we describe the different mechanisms that make light interact with sound, and show how to treat them from a theoretical point of view. We then illustrate the different photon-phonon interaction processes with numerical simulations in realistic phoxonic cavities and waveguides. Finally, we introduce some possible applications which can take enormous benefit from the enhanced interaction between light and sound at the nanoscale.

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“…In addition, the electric field enhancement at the gaps is reduced from E E i 2 = 2065. 4 to E E i 2 = 1701.6 when the HRI is introduced and the frequency is redshifted. Since the MIM structures in general can be considered as a resonant LC circuit with the metal strips and the gaps at the ends as inductors and capacitors respectively [2,11], it appears that inserting the HRI material at the center reduces the potential drop between the strips pairs which in turn increases the capacitance resulting in an increased current and a higher magnetic moment.…”

Section: Results and Analysismentioning

confidence: 99%

“…As a result, the magnetic plasmon resonance appears in the optical-NIR range of the spectrum [2,3]. Several structures have been proposed in the literature to demonstrate magnetic hot spots including nanorings [4], MIM nanosandwiches [5][6][7] and nanoparticle clusters [8,9]. The MIM structure (nanosandwich) consists of two metallic strips separated by a dielectric layer.…”

Section: Introductionmentioning

confidence: 99%

Giant Magnetic Field Enhancement in Hybridized MIM Structures

Alrasheed

2017

IEEE Photon. Technol. Lett.

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Abstract-We propose numerically an approach to narrow the plasmon linewidth and enhance the magnetic near field intensity at a magnetic hot spot in a hybridized metal-insulatormetal (MIM) structure. First we insert in part of the dielectric layer of the MIM, at its center, another dielectric material of a high refractive index (HRI). This results in an increase in the magnetic near field enhancement of the magnetic plasmon (MP) resonance by 82% compared with the MIM without the HRI material. We then couple this enhanced MP resonance to a propagating surface plasmon polariton (SPP) to achieve a further enhancement of 438%. The strong coupling between the MP and the SPP is demonstrated by the large anti-crossing in the reflection spectra. The resulting maximum magnetic field enhancement at the gap is ∼ H H i 2 = 3555 .

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Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

Cited by 53 publications

References 32 publications

Gold nanorings synthesized via a stress-driven collapse and etching mechanism

Gold nanorings synthesized via a stress-driven collapse and etching mechanism

Modeling light-sound interaction in nanoscale cavities and waveguides

Giant Magnetic Field Enhancement in Hybridized MIM Structures

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