On the absorption and electromagnetic field spectral shifts in plasmonic nanotriangle arrays

Vedraine, Sylvain; Hou, Renjie; Norton, P. R.; Lagugné‐Labarthet, François

doi:10.1364/oe.22.013308

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…To better visualize the spatial distribution of the multiple resonances, the iso-wavelength maps at the orthogonal polarizations were calculated (Figure 4). 57 In this representation, each map is first calculated at 44 discrete wavelengths over a spectral range of 1.4 -10 µm. For each polarization, this forms a 3 rd rank tensor of dimensions X(308), Y(308) and λ (44).…”

Section: General Optical Properties Of Dendritic Fractalsmentioning

confidence: 99%

Dendritic Plasmonics for Mid-Infrared Spectroscopy

et al. 2017

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Metallic nanostructures that exhibit tailored optical resonances spanning from the near to midinfrared spectral range are of particular interest for spectroscopic and optical measurements in these spectral domains that can benefit from localized surface-enhancement effects. Plasmon resonances shifted in the near or mid-infrared range could be used to further enhance the excitation and/or the emission of an optical process. Surface-enhanced infrared absorption (SEIRA) is one of such processes and can particularly benefit from plasmon-enhanced local fields yielding an increase in sensitivity towards the detection of an analyte. Herein, we have fabricated a series of gold dendritic nanostructures, prepared by electron-beam lithography, that exhibit plasmon resonances spanning the near and mid-infrared spectral regions. We explore the influence of the number of branches of the dendritic structures, as well as the length of each generation together with the overall effect of the shape and symmetry on the resulting optical

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Section: General Optical Properties Of Dendritic Fractalsmentioning

confidence: 99%

Dendritic Plasmonics for Mid-Infrared Spectroscopy

et al. 2017

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“…In the simulation, we compare shifts of tip absorption peaks, which are indicative of the shift of LSPR position. [9,19,25] The absorption at the apex of the gold tip was simulated for three configurations, the tip on top of a planar surface, at a rectangular shaped step and at a concave shaped step. As the SrTiO 3 to air volume ratio increases from configuration (a) to (c), the simulation spectra show a shift to higher wavenumber (Fig.…”

Section: Resultsmentioning

confidence: 99%

Topography-induced variations of localized surface plasmon resonance in tip-enhanced Raman configuration

Youssef¹,

Zhang²,

Dörfler³

et al. 2020

Opt. Express

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We report on topography-induced changes of the localized surface plasmon resonance (LSPR) enhanced luminescence of gold tip on SrTiO 3 nanostructures with apertureless scanning near-field optical microscopy (aSNOM) in tip-enhanced Raman spectroscopy (TERS) configuration. Our experimental and simulated results indicate that the averaged refractive index of the dielectric environment of the tip apex containing both air and SrTiO 3 in variable volume ratios, is dependent on the topography of the sample. This reveals that the local topography has to be taken into consideration as an additional contribution to the position of the LSPR.

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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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On the absorption and electromagnetic field spectral shifts in plasmonic nanotriangle arrays

Cited by 12 publications

References 14 publications

Dendritic Plasmonics for Mid-Infrared Spectroscopy

Dendritic Plasmonics for Mid-Infrared Spectroscopy

Topography-induced variations of localized surface plasmon resonance in tip-enhanced Raman configuration

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

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