Optical Plasmons of Individual Gold Nanosponges

Vidal, Cynthia; Wang, Dong; Schaaf, Peter; Hrelescu, Calin; Klar, Thomas A.

doi:10.1021/acsphotonics.5b00281

Cited by 49 publications

(84 citation statements)

References 36 publications

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“…In order to get a more deeper insight on the optical behavior and properties experimentally, Vidal et al have perfomred the measurements of single particle order single nanosponge spectroscopy, and revealed that the optical properties of the individual nanosponges are much more complicated than those of their solid conterparts [22]. The plasmon renonance of the individual gold nanosponges with similar form, size, porosity, and ligament/ pore size differs notably from each other.…”

Section: Multiple Plasmon Resonances and Polarization Dependencementioning

confidence: 99%

“…Furthermore, the gold nanosponges demonstrate an interesting and strong polarization effect [22,23]. Figure 7 shows the SEM images of two individual gold nanosponges and the corresponding polarization-dependent scattering spectra.…”

Section: Multiple Plasmon Resonances and Polarization Dependencementioning

confidence: 99%

“…The plasmonic properties can be tuned further by forming the structure of hybrid nanosponges [18,21]. The nanosponges show strong polarization dependence due to the structural anisotropy contributed from the constraint of the nanoporous structure within a limited nanosponge or particle size [22,23]. Strong nonlinear optical behavior and even long-lived plasmon modes can be also observed in the gold nanosponges [24], which can be therefore used as efficient nanoantenna for many spectroscopic and sensing applications.…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic nanosponges

Wang

Schaaf

2018

Advances in Physics: X

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Gold nanosponges, or nanoporous gold nanoparticles, possess a percolated nanoporous structure over the entire nanoparticles. The optical and plasmonic properties of gold nanosponges and its related hybrid nanosponges are very fascinating due to the unique structural feature, and are controllable and tuneable in a large scope by changing the structural parameters like pore/ligament size, porosity, particle size, particles form, and hybrid structure. The nanosponges show the strong polarization dependence and multiple resonances behavior. Besides, the nanosponges exhibit a significantly higher local field enhancement than the solid nanoparticles. Strong nonlinear optical properties are confirmed by their high-order photoemission behavior, whereby long-lived plasmon modes are also clearly observed. All this is very important and relevant for the applications in enhanced Raman scattering, fluorescence manipulation, sensing, and nonlinear photonics.

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Section: Multiple Plasmon Resonances and Polarization Dependencementioning

confidence: 99%

Section: Multiple Plasmon Resonances and Polarization Dependencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plasmonic nanosponges

Wang

Schaaf

2018

Advances in Physics: X

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“…were fabricated and tested as versatile SERS substrates [12][13][14][15][16][17][18][19][20][21][22][23] . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] .…”

mentioning

confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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Pulsed-laser dry printing of noble-metal microrings with a tunable internal porous structure, which can be revealed via an ion-beam etching post-procedure, was demonstrated. Abundance and average size of the pores inside the microrings were shown to be tuned in a wide range by varying incident pulse energy and a nitrogen doping level controlled in the process of magnetron deposition of the gold film in the appropriate gaseous environment. The fabricated porous microrings were shown to provide many-fold near-field enhancement of incident electromagnetic fields, which was confirmed by mapping of the characteristic Raman band of a nanometer-thick covering layer of Rhodamine 6G dye molecules and supporting finite-difference time-domain calculations. The proposed laserprinting/ion-beam etching approach is demonstrated to be a unique tool aimed at designing and fabricating multifunctional plasmonic structures and metasurfaces for spectroscopic bioidentification based on surface-enhanced infrared absorption, Raman scattering and photoluminescence detection schemes.Surface-enhanced Raman scattering (SERS) is an ultra-sensitive non-invasive spectroscopic technique based on a label-free identification of different molecules placed in the vicinity of plasmonic-active nanostructured metallic substrates 1-4 . Intensity of the characteristic Raman signal defining the specific vibrational signatures of individual molecules is usually very weak. However, this signal can be significantly increased near nanotextured surfaces or nanostructures generating localized, strongly enhanced plasmon-mediated electromagnetic fields. Since the first observation of SERS signal from single molecule 5 , multiple attempts were undertaken to increase the efficiency of SERS-active nanotextured substrates in terms of achieved maximal enhancement factor inside a single "hot spot" as well as number (density) of "hot spots" per individual nanostructure 6-11 .To address both issues, variety of nanotextured structures, predominantly having large surface-to-volume ratio and generating dense hot spots (tipped structures, nanostructures with inner porosity, intra-gap structures or self-assembly superstructures, etc.) were fabricated and tested as versatile SERS substrates 12-23 . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] . Several papers reported fabrication of such sponge-like structures, using dealloying of the two-component template via its dissolving in a corrosive environment 27,28 . Meanwhile, to design sensitive elements for advanced biosensors, along with desirable porosity, it is also important to control the overall size and shape of such porous templates as well as to arrange them into well-ordered arrays at specific point on a substrate with micrometer-scale lateral accuracy. Despite the latter issue can be resolved by using well-establis...

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“…High surface-to-volume ratio coupled with multiple plasmon resonances in the visible or near-infrared (NIR) range is critical for surface-enhanced Raman scattering (SERS) [112] or IR spectroscopy (SEIRA) [113]. Despite the diminished crosssection that dampens plasmon resonance in nanoparticles with diameters below 15 nm [114], more complicated structures such as nanostars [115] or nanosponges [116] create large scattering cross-sections, as well as further enhanced surface-to-volume ratio.…”

Section: Organic 1d Semiconductor Systemsmentioning

confidence: 99%

Electrospinning for nano- to mesoscale photonic structures

et al. 2016

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Abstract:The fabrication of photonic and electronic structures and devices has directed the manufacturing industry for the last 50 years. Currently, the majority of small-scale photonic devices are created by traditional microfabrication techniques that create features by processes such as lithography and electron or ion beam direct writing. Microfabrication techniques are often expensive and slow. In contrast, the use of electrospinning (ES) in the fabrication of microand nano-scale devices for the manipulation of photons and electrons provides a relatively simple and economic viable alternative. ES involves the delivery of a polymer solution to a capillary held at a high voltage relative to the fiber deposition surface. Electrostatic force developed between the collection plate and the polymer promotes fiber deposition onto the collection plate. Issues with ES fabrication exist primarily due to an instability region that exists between the capillary and collection plate and is characterized by chaotic motion of the depositing polymer fiber. Material limitations to ES also exist; not all polymers of interest are amenable to the ES process due to process dependencies on molecular weight and chain entanglement or incompatibility with other polymers and overall process compatibility. Passive and active electronic and photonic fibers fabricated through the ES have great potential for use in light generation and collection in optical and electronic structures/ devices. ES produces fiber devices that can be combined with inorganic, metallic, biological, or organic materials for novel device design. Synergistic material selection and postprocessing techniques are also utilized for broad-ranging applications of organic nanofibers that span from biological to electronic, photovoltaic, or photonic. As the ability to electrospin optically and/or electronically active materials in a controlled manner continues to improve, the complexity and diversity of devices fabricated from this process can be expected to grow rapidly and provide an alternative to traditional resource-intensive fabrication techniques.

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Optical Plasmons of Individual Gold Nanosponges

Cited by 49 publications

References 36 publications

Plasmonic nanosponges

Plasmonic nanosponges

Fabrication of porous microrings via laser printing and ion-beam post-etching

Electrospinning for nano- to mesoscale photonic structures

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