Functional Nanostructured Plasmonic Materials

Yao, Jiang; Le, An Phong; Gray, Stephen K.; Moore, Jeffrey S.; Rogers, John A.; Nuzzo, Ralph G.

doi:10.1002/adma.200904097

Cited by 114 publications

(104 citation statements)

References 103 publications

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“…We also note that a closely related array structure has been reported recently, which consists of periodically perforated nanoscale holes in a gold film with a gold nanodisk at the bottom of each hole [42][43][44] . This structure can be thought of as an inverse one to our GMRA.…”

Section: Discussionmentioning

confidence: 99%

Plasmonic gold mushroom arrays with refractive index sensing figures of merit approaching the theoretical limit

et al. 2013

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Localized surface plasmon resonance (LSPR)-based sensing has found wide applications in medical diagnosis, food safety regulation and environmental monitoring. Compared with commercial propagating surface plasmon resonance (PSPR)-based sensors, LSPR ones are simple, cost-effective and suitable for measuring local refractive index changes. However, the figure of merit (FOM) values of LSPR sensors are generally 1-2 orders of magnitude smaller than those of PSPR ones, preventing the widespread use of LSPR sensors. Here we describe an array of submicrometer gold mushrooms with a FOM reaching B108, which is comparable to the theoretically predicted upper limit for standard PSPR sensors. Such a high FOM arises from the interference between Wood's anomaly and the LSPRs. We further demonstrate the array as a biosensor for detecting cytochrome c and alpha-fetoprotein, with their detection limits down to 200 pM and 15 ng ml À 1 , respectively, suggesting that the array is a promising candidate for label-free biomedical sensing.

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Section: Discussionmentioning

confidence: 99%

Plasmonic gold mushroom arrays with refractive index sensing figures of merit approaching the theoretical limit

et al. 2013

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“…This is due to such advantages as the broad plasmon resonance in the UV−visible−near infrared region, high stability of the structures, and reliable preparation techniques [3][4][5]. The lithographic ones by means of elec− tron and ion beams, electrospraying, and direct laser 2D and 3D structuring belong to the well proven [6,7].…”

Section: Introductionmentioning

confidence: 99%

Nanostructuring of thin Au films by means of short UV laser pulses

Grochowska

Nedyalkov

Atanasov

et al. 2011

Opto-Electronics Review

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The particle size distribution, morphology and optical properties of the Au nanoparticle (NP) structures for surface enhanced Raman signal (SERS) application are investigated in dependence on their preparation conditions. The structures are produced from relatively thin Au films (10–20 nm) sputtered on fused silica glass substrate and irradiated with several pulses (6 ns) of laser radiation at 266 nm and at fluencies in the range of 160–412 mJ/cm2. The SEM inspection reveals nearly homogeneously distributed, spherical gold particles. Their initial size distribution of the range of 20–60 nm broadens towards larger particle diameters with prolonged irradiation. This is accompanied by an increase in the uncovered surface of the glass substrate and no particle removal is observed. In the absorption profiles of the nanostructures, the broad peak centred at 546 nm is ascribed to resonant absorption of surface plasmons (SPR). The peak position, halfwidth and intensity depend on the shape, size and size distribution of the nanostructured particles in agreement with literature. From peak intensities of the Raman spectra recorded for Rhodamine 6G in the range of 300–1800 cm−1, the relative signal enhancement by factor between 20 and 603 for individual peaks is estimated. The results confirm that the obtained structures can be applied for SERS measurements and sensing.

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“…Noble metal nanostructure arrays have pronounced surface plasmon resonance, which results from incident electromagnetic radiation exciting coherent oscillations of conduction electrons near a metal-dielectric interface [102]. Giessen and co-workers introduced an angle-controlled colloidal lithography as a fast and low-cost fabrication technique for large-area periodic plasmonic oligomers with complex shape and tunable geometry parameters, and investigated the optical properties and found highly modulated plasmon modes in oligomers with triangular building blocks.…”

Section: Optical Propertiesmentioning

confidence: 99%