Fabrication of Elliptical Nanorings with Highly Tunable and Multiple Plasmonic Resonances

Cai, Yuzhe; Li, Yang; Nordlander, Peter; Cremer, Paul S.

doi:10.1021/nl302428z

Cited by 67 publications

(62 citation statements)

References 68 publications

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“…In fact, similar localized surface plasmon resonance features have also been observed in various ring-like Au nanostructures fabricated by nanosphere lithography and electron beam lithography techniques. 50,51 In addition, we also studied the influences of various outer diameters on the SPR modes with constant inner hole sizes, for example, 58 and 293 nm. Figure 6c and Supplementary Figure S17 indicate that, under a constant inner hole size, the peaks redshift as the outer diameter of the Au nanorings increases.…”

Section: Growth Mechanism Of Au Nanoframes and Nanoringsmentioning

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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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: Growth Mechanism Of Au Nanoframes and Nanoringsmentioning

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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“…The obtained results and their comparison with the theoretical model (SI) are presented in Table S1. [ 37 ] The behavior of the diffraction angles as a function of the applied strain is presented in Figure 4 c, along with the theoretical model discussed in detail in the SI. We next explored how elongation affected the PC imprinted in the elastomer.…”

mentioning

confidence: 99%

Thermoresponsive Shape‐Memory Photonic Nanostructures

Espinha

Serrano

Blanco

et al. 2014

Advanced Optical Materials

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516 wileyonlinelibrary.com COMMUNICATION www.MaterialsViews.com www.advopticalmat.depreparation of compression sensitive inverse opals which allow the mechanical tuning of the photonic stopgap position. [ 18 ] Elastomers have also played a fundamental role for studying color tunable photonic crystals (PCs), [ 19,20 ] whose lattice parameter might be controlled by deformation (mechanochromic effect) or elastomer swelling. [ 21 ] An equivalent approach was proposed for the development of tunable phononic crystals. [ 22 ] Another active area of research concerns fl exible systems implemented, for instance, as UV-fi lters [ 23 ] and light emitting diodes or displays. [ 24 ] The present work addresses the fabrication of periodic nanofeatures with SME by using a replica molding approach for imprinting a 2D photonic nanostructure on the surface of a shape-memory elastomer. Structural and optical characterization of the as-produced system allowed to demonstrate its shape-memory functionality for confi guring the lattice parameter or erasing the nanopattern. This property might be very attractive, for example, for the development of reusable or self-healing photonic elements with adaptive properties.Polydiolcitrates (PDCs), fi rst described by Ameer and colleagues in 2004, [ 25 ] have been recently identifi ed as thermoresponsive elastomers presenting SME. [ 26 ] However, as far as we know, their applicability in the accomplishment of photonic nanostructured systems has not been reported in the literature yet. The synthesized polyester networks were obtained upon:(1) increase of the mol ratio of hydroxyl to carboxyl groups in the reaction mixture (4:3 in hydroxyl-dominant PDCs versus 1:1 in the original ones) and (2) the use of a more hydrophobic diol (e.g., 1,12-dodecanediol, DD). These polymers include covalent netpoints responsible for the permanent shape and hydrophobic micro-domains (either pre-polymer or DD-rich domains) physically cross-linked by intermolecular hydrophobic interactions as switch structures to fi x the temporary shape. To investigate the SME of these polymers for potential photonic applications, we followed the general procedure depicted in Figure 1 . The fi rst step consisted of the synthesis of the pre-polymer solution composed of DD and citric acid. 1 H nuclear magnetic resonance ( 1 H-NMR) confi rmed the mol ratio expected for both components (1.5) and the beginning of the condensation reaction (e.g., multiplicity of peaks at 2.6-2.9 ppm) (see Supporting Information (SI), Figure S7). Nanopatterning of the elastomer surface was achieved by using an approach inspired in soft-lithography [ 27 ] and, more specifi cally, in replica molding (Figure 1 a). [ 28,29 ] Briefl y, the pre-polymer solution was spread over the template, in our case a colloidal monolayer composed of polystyrene (PS) spheres of 870 nm in diameter ( d ). After curing at 90 °C for 12 h, the resulting cross-linked poly mer (PDDC-HD) was peeled off from the monolayer. When evaluating the cross-linking degree of the so-produced elast...

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“…For pure semi-cylindrical nanoshells without the gold film, we observed tri-dipole resonance293031323334353637 at λ = 479 nm, as shown in Fig. 1(f), and indicated by the three curved arrows.…”

Section: Resultsmentioning

confidence: 72%

Plasmonic plano-semi-cylindrical nanocavities with high-efficiency local-field confinement

Liu

Fang

2017

Sci Rep

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Plasmonic nanocavity arrays were achieved by producing isolated silver semi-cylindrical nanoshells periodically on a continuous planar gold film. Hybridization between localized surface plasmon resonance (LSPR) in the Ag semi-cylindrical nanoshells (SCNS) and surface plasmon polaritons (SPP) in the gold film was observed as split bonding and anti-bonding resonance modes located at different spectral positions. This led to strong local field enhancement and confinement in the plano-concave nanocavites. Narrow-band optical extinction with an amplitude as high as 1.5 OD, corresponding to 97% reduction in the transmission, was achieved in the visible spectrum. The resonance spectra of this hybrid device can be extended from the visible to the near infrared by adjusting the structural parameters.

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Fabrication of Elliptical Nanorings with Highly Tunable and Multiple Plasmonic Resonances

Cited by 67 publications

References 68 publications

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

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

Thermoresponsive Shape‐Memory Photonic Nanostructures

Plasmonic plano-semi-cylindrical nanocavities with high-efficiency local-field confinement

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