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

Hennemann, L. E.; Kolloch, Andreas; Kern, Andreas; Mihaljević, Josip; Boneberg, Johannes; Leiderer, Paul; Meixner, Alfred J.; Zhang, Dai

doi:10.3762/bjnano.3.77

Cited by 19 publications

(10 citation statements)

References 37 publications

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“…From this knowledge one can draw conclusions on how trustworthy simulations of even more complicated plasmonic structures, e.g., for the design of sophisticated optical antennas, will be. The method described here should also be applicable for higher order polarizations, like azimuthally or radially polarized laser beams, as they have been used to excite plasmon modes in triangular nanostructures in a confocal microscope [43]. …”

Section: Resultsmentioning

confidence: 99%

Mapping of plasmonic resonances in nanotriangles

Dickreuter¹,

Gleixner²,

Kolloch³

et al. 2013

Beilstein J. Nanotechnol.

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SummaryPlasmonic resonances in metallic nano-triangles have been investigated by irradiating these structures with short laser pulses and imaging the resulting ablation and melting patterns. The triangular gold structures were prepared on Si substrates and had a thickness of 40 nm and a side length of ca. 500 nm. Irradiation was carried out with single femtosecond and picosecond laser pulses at a wavelength of 800 nm, which excited higher order plasmon modes in these triangles. The ablation distribution as well as the local melting of small parts of the nanostructures reflect the regions of large near-field enhancement. The observed patterns are reproduced in great detail by FDTD simulations with a 3-dimensional model, provided that the calculations are not based on idealized, but on realistic structures. In this realistic model, details like the exact shape of the triangle edges and the dielectric environment of the structures are taken into account. The experimental numbers found for the field enhancement are typically somewhat smaller than the calculated ones. The results demonstrate the caveats for FDTD simulations and the potential and the limitations of “near field photography” by local ablation and melting for the mapping of complex plasmon fields and their applications.

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Section: Resultsmentioning

confidence: 99%

Mapping of plasmonic resonances in nanotriangles

Dickreuter¹,

Gleixner²,

Kolloch³

et al. 2013

Beilstein J. Nanotechnol.

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“…The latter effect creates a huge enhancement of electromagnetic elds in the vicinity of tips. 10,14,15,16 Furthermore, recent investigations of gold triangles point out the mutual importance of the resonance position and tip-to-tip orientation for their optical response. 13,14,19 Recently, plasmonic circuitry at the micrometer scale made from metallic nanotriangles and nanoprisms was demonstrated with potential applications in telecommunication technology.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical enhancement caused by a higher order multipole mode of metallic triangles

et al. 2015

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“…The resulting local melting reveals the hot spots, but at the cost of the sample destruction. Other methods use surface enhanced Raman spectroscopy (SERS) [ 28 – 29 ].…”

Section: Resultsmentioning

confidence: 99%

Optical near-field mapping of plasmonic nanostructures prepared by nanosphere lithography

Kolhatkar¹,

Merlen²,

Zhang³

et al. 2018

Beilstein J. Nanotechnol.

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We introduce a simple, fast, efficient and non-destructive method to study the optical near-field properties of plasmonic nanotriangles prepared by nanosphere lithography. Using a rectangular Fourier filter on the blurred signal together with filtering of the lower spatial frequencies to remove the far-field contribution, the pure near-field contributions of the optical images were extracted. We performed measurements using two excitation wavelengths (532.1 nm and 632.8 nm) and two different polarizations. After the processing of the optical images, the distribution of hot spots can be correlated with the topography of the structures, as indicated by the presence of brighter spots at the apexes of the nanostructures. This technique is validated by comparison of the results to numerical simulations, where agreement is obtained, thereby confirming the near-field nature of the images. Our approach does not require any advanced equipment and we suggest that it could be applied to any type of sample, while keeping the measurement times reasonably short.

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

Cited by 19 publications

References 37 publications

Mapping of plasmonic resonances in nanotriangles

Mapping of plasmonic resonances in nanotriangles

Nonlinear optical enhancement caused by a higher order multipole mode of metallic triangles

Optical near-field mapping of plasmonic nanostructures prepared by nanosphere lithography

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