Fabrication of metallic nanostructures for investigating plasmon-induced field enhancement

Stade, F.; Heeren, A.; Fleischer, Monika; Kern, D. P.

doi:10.1016/j.mee.2007.01.256

Cited by 35 publications

(25 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is important to stress that to this end we would consider a device integrating a large number of nanocones, a scenario already demonstrated in previous reports. [40,48] The actual response of the device would be controlled by illumination parameters such as polarization and angle (e.g., tilted illumination) and by the device material and geometrical characteristics such as the spatial arrangement of the nanocones (e.g., randomly or perfectly aligned nanocone arrays). In this regard, we go one step further to anticipate that the effect of tilting the incoming illumination ( Figure S7, Supporting Information) is of strong importance in assuring an individual response of the nanocone in promoting nanoscale temperature gradients.…”

Section: Resultsmentioning

confidence: 99%

Photoinduced Temperature Gradients in Sub‐Wavelength Plasmonic Structures: The Thermoplasmonics of Nanocones

Cunha

Guo

Koya

et al. 2020

Advanced Optical Materials

View full text Add to dashboard Cite

Plasmonic structures are renowned for their capability to efficiently convert light into heat at the nanoscale. However, despite the possibility to generate deep sub‐wavelength electromagnetic hot spots, the formation of extremely localized thermal hot spots is an open challenge of research, simply because of the diffusive spread of heat along the whole metallic nanostructure. Here this challenge is tackled by exploiting single gold nanocones. It is theoretically shown how these structures can indeed realize extremely high temperature gradients within the metal, leading to deep sub‐wavelength thermal hot spots, owing to their capability of concentrating light at the apex under resonant conditions even under continuous wave illumination. A 3D finite element method model is employed to study the electromagnetic field in the structure and subsequent thermoplasmonic behavior, in terms of the 3D temperature distribution. How the latter is affected by nanocone size, shape, and composition of the surrounding environment is shown. Finally, the use of photoinduced temperature gradients in nanocones is anticipated for applications in optofluidics and thermoelectrics or for thermally induced nanofabrication.

show abstract

Section: Resultsmentioning

confidence: 99%

Photoinduced Temperature Gradients in Sub‐Wavelength Plasmonic Structures: The Thermoplasmonics of Nanocones

Cunha

Guo

Koya

et al. 2020

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…[36][37][38][39] The (25 μm) 2 arrays of gold nanocones with different distances between the cones used in this study are fabricated by applying electron beam lithography using PMMA (polymethyl methacrylate) for the preparation of Al 2 O 3 etch masks by a lift-off process. The fabrication processes developed by the authors are based on the transfer of circular etch masks into a gold layer by argon ion milling, during which the conical shape of the nanostructures is formed.…”

Section: Methodsmentioning

confidence: 99%

Capturing molecules with plasmonic nanotips in microfluidic channels by dielectrophoresis

2015

View full text Add to dashboard Cite

Over the last decades, different concepts have been established for the use of plasmonic nanostructures in sensing applications. One challenge in this context lies in delivering the analyte of interest to the location of the nanostructures and selectively attaching it to their surfaces. Here we present a method for the collection and concentration of molecules on arrays of metallic nanocones, making use of the high electric field gradients at the nanotips. For this purpose, the nanocones are integrated into a microfluidic channel and used as nanoelectrodes. By applying an AC voltage, dielectrophoresis is used to capture molecules from the channel region near the nanocones. Simulations of the dielectrophoretic forces in the channel are presented as well as experimental proof of the proposed method. After attachment of the molecules, optical read-out techniques can directly be performed on the plasmonic nanostructures.

show abstract

“…Dry etching of metal films through a nanostructured mask is fundamentally similar to focused ion beam milling, yet it is a much faster process. With the dry etching, large areas of nanocones can be produced on planar or even non-planar surfaces [10,18,[23][24][25][26][27][28][29][30]. The third fabrication strategy is based on the self-formation of nanocones inside cylindrical nanowell templates during the deposition of the respective metal, making use of an effect which is known as aperture clogging or self-shading [15,23,31,32].…”

Section: Introductionmentioning

confidence: 99%

Effect of deposition angle on fabrication of plasmonic gold nanocones and nanodiscs

Liška

Ligmajer

Pinho

et al. 2020

Microelectronic Engineering

View full text Add to dashboard Cite

Metal nanocones can exhibit several strong plasmonic resonances, which are associated with intense and accessible electromagnetic hot spots. They can thus be used to enhance light-matter interactions or to facilitate location-specific sensing while enabling separation of some non-specific contributions towards the sensing signal. Nanocones and similar 3D structures are often fabricated with the use of the so-called self-shading effect, which occurs during the evaporation of a metal film into circular nanowells. Unfortunately, a full description of a successful deposition process with all the essential details is currently missing in literature. Here we present a detailed view of the fabrication of ordered arrays of conical gold nanostructures using electron beam lithography and gold electron beam evaporation. We show that the symmetry of the fabricated nanostructures is influenced by the lateral position of the substrate on the sample holder during the deposition. Off-axis deposition or tilt of the sample leads to asymmetric nanostructures. When the deposited film is thick enough, or the nanowells narrow enough, the entrance aperture is clogged, and nanocones with sharp tips are formed. In contrast, flat-top truncated cones are produced for thinner films or wider nanowells. All these findings help to identify inherent limits for the production of wafer-scale arrays of such non-planar nanostructures. On the other hand, they also suggest new fabrication possibilities for more complicated structures such as mutually connected nanocones for electrically addressable chips.

show abstract

Fabrication of metallic nanostructures for investigating plasmon-induced field enhancement

Cited by 35 publications

References 4 publications

Photoinduced Temperature Gradients in Sub‐Wavelength Plasmonic Structures: The Thermoplasmonics of Nanocones

Photoinduced Temperature Gradients in Sub‐Wavelength Plasmonic Structures: The Thermoplasmonics of Nanocones

Capturing molecules with plasmonic nanotips in microfluidic channels by dielectrophoresis

Effect of deposition angle on fabrication of plasmonic gold nanocones and nanodiscs

Contact Info

Product

Resources

About