Visualization of Near-Field Enhancements of Gold Triangles by Nonlinear Photopolymerization

Geldhauser, Tobias; Ikegaya, Shintarou; Kolloch, Andreas; Murazawa, Naoki; Ueno, Kosei; Boneberg, Johannes; Leiderer, Paul; Scheer, Elke; Misawa, Hiroaki

doi:10.1007/s11468-010-9189-9

Cited by 25 publications

(20 citation statements)

References 42 publications

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“…When using colloids with a diameter of 320 nm, one obtains triangles with a side length of about 85 nm. Larger triangles with a side length of 540 nm were produced using colloids with a diameter of 1500 nm (the colloids were polystyrene particles by Interfacial Dynamics Corp.) [22).…”

Section: Femtosecond Ablationmentioning

confidence: 99%

Femtosecond and picosecond near-field ablation of gold nanotriangles: nanostructuring and nanomelting

et al. 2011

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We report on recent insights into the interaction between ultra-fast laser pulses and plasmonic nanoparticles. We discuss femtosecond near-field ab lation as a simple but versatile too l for the nanoscale modification of surFaces and the high-resolution measurement of a nanostructure's near fi eld. Two model systems are presented, illustrating the com-p\t:Xily of near-field distributions. Furthermon::, finite difference time domain calculations in combination with absorption spectra provide a deeper insight into the factors influ encing the near-field distribution. For the first time, an almost perfect agreement between the measured ablation pattern and experiment has been reached for gold triangles with a side length around 500 nm. Additionally, the results from picosecond laser irradiated plasmonic structures displaya new regime of nanoscale laser material processing. We present first resu lts showing nanometre confined melting induced by laser pulses.

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Section: Femtosecond Ablationmentioning

confidence: 99%

Femtosecond and picosecond near-field ablation of gold nanotriangles: nanostructuring and nanomelting

et al. 2011

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“…26,27 Another method for near-field detection is to depict the field distribution ex situ in a modifiable matrix. This can either be a photoactive material, such as a photoresist that is cast onto the nanostructures [28][29][30][31] or it can be imprinted in an imaging layer below the particles 32,33 or directly into the surface, where the nanoparticles are lying on. 6,7,10,34 These techniques have the advantage of a higher resolution than SNOMs, as they are only limited by the resolution of the (classical) detection method for the surface morphology (e.g., SEM and AFM).…”

Section: A Pattern Formationmentioning

confidence: 99%

Structural study of near-field ablation close to plasmon-resonant nanotriangles

Kolloch

Leiderer

Ibrahimkutty

et al. 2012

Journal of Laser Applications

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The optical near fields in close vicinity to plasmonic nanoscale objects show a considerable enhancement of the electrical field and are localized to dimensions much less than the wavelength of light. The authors show that an ablation process caused by the near-field enhancement of femtosecond laser pulses pattern the substrate below gold nanotriangles is a way to image the near-field distribution with a resolution below 20 nm. The mechanism of ablation studied by pulsed x-ray scattering reveals the nonthermal nature of the process.

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“…This so-called near field can be highly enhanced and strongly confined in space. So far, the near field at the outline of nano-particles in general [2] and nano-triangles in particular [3–6] has been investigated both directly and indirectly.…”

Section: Introductionmentioning

confidence: 99%

“…Optical extinction spectroscopy [8], confocal microscopy [9], photopolymerisation [6] and near-field ablation [3,10–11] have been performed. It was found that the material of the triangles plays a distinct role [9], as do the triangles' edge length and height [3,8,10–11] and the material of the underlying substrate [12].…”

Section: Introductionmentioning

confidence: 99%

Assessing the plasmonics of gold nano-triangles with higher order laser modes

Hennemann¹,

Kolloch²,

Kern³

et al. 2012

Beilstein J. Nanotechnol.

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SummaryRegular arrays of metallic nano-triangles – so called Fischer patterns – are fabricated by nano-sphere lithography. We studied such gold nano-triangle arrays on silicon or glass substrates. A series of different samples was investigated with a parabolic mirror based confocal microscope where the sample is scanned through the laser focus. By employing higher order laser modes (azimuthally and radially polarised laser beams), we can excite the Fischer patterns using either a pure in-plane (x,y) electric field or a strongly z-directional (optical axis of the optical microscope) electric field. We collected and evaluated the emitted luminescence and thereby investigated the respectively excited plasmonic modes. These varied considerably: firstly with the light polarisation in the focus, secondly with the aspect ratio of the triangles and thirdly with the employed substrate. Moreover, we obtained strongly enhanced Raman spectra of an adenine (sub-)monolayer on gold Fischer patterns on glass. We thus showed that gold Fischer patterns are promising surface-enhanced Raman scattering (SERS) substrates.

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Visualization of Near-Field Enhancements of Gold Triangles by Nonlinear Photopolymerization

Cited by 25 publications

References 42 publications

Femtosecond and picosecond near-field ablation of gold nanotriangles: nanostructuring and nanomelting

Femtosecond and picosecond near-field ablation of gold nanotriangles: nanostructuring and nanomelting

Structural study of near-field ablation close to plasmon-resonant nanotriangles

Assessing the plasmonics of gold nano-triangles with higher order laser modes

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