Comparison of electron energy-loss and quantitative optical spectroscopy on individual optical gold antennas

Husnik, Martin; Cube, Felix von; Irsen, Stephan; Lindén, Stefan; Niegemann, Jens; Busch, Kurt; Wegener, Martin

doi:10.1515/nanoph-2013-0031

Cited by 15 publications

(15 citation statements)

References 15 publications

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“…The horizontal features in the contour plot are artifacts which stem from periodic cleaning of the sample in an oxygen plasma to remove carbonaceous contamination caused by the illumination with the electron beam. The first cleaning of the sample with an oxygen plasma prior to the EELS experiments can result in a small blueshift of the resonances [25]. This can probably be traced back to the removal of organic residues from the fabrication process.…”

Section: Resultsmentioning

confidence: 99%

Angular-resolved electron energy loss spectroscopy on a split-ring resonator

et al. 2014

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We investigate the plasmonic near field of a lithographically defined split-ring resonator with angular-resolved electron energy loss spectroscopy in a scanning transmission electron microscope. By tilting the sample, different electric field components of the plasmonic modes can be probed with the electron beam. The electron energy loss spectra recorded under oblique incidence can feature plasmonic resonances that are not observable under normal incidence. Our experimental findings are supported by full numerical calculations based on the discontinuous Galerkin time-domain method

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Section: Resultsmentioning

confidence: 99%

Angular-resolved electron energy loss spectroscopy on a split-ring resonator

et al. 2014

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“…Furthermore, complications in carrying out EELS and optical spectroscopy under different environmental conditions can lead to slight energy shifts when confronting the two types of spectra (see ref. 39 and references therein).…”

Section: Discussionmentioning

confidence: 99%

Extremely confined gap surface-plasmon modes excited by electrons

et al. 2014

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High-spatial and energy resolution electron energy-loss spectroscopy (EELS) can be used for detailed characterization of localized and propagating surface-plasmon excitations in metal nanostructures, giving insight into fundamental physical phenomena and various plasmonic effects. Here, applying EELS to ultra-sharp convex grooves in gold, we directly probe extremely confined gap surface-plasmon (GSP) modes excited by swift electrons in nanometre-wide gaps. We reveal the resonance behaviour associated with the excitation of the antisymmetric GSP mode for extremely small gap widths, down to B5 nm. We argue that excitation of this mode, featuring very strong absorption, has a crucial role in experimental realizations of non-resonant light absorption by ultra-sharp convex grooves with fabricationinduced asymmetry. The occurrence of the antisymmetric GSP mode along with the fundamental GSP mode exploited in plasmonic waveguides with extreme light confinement is a very important factor that should be taken into account in the design of nanoplasmonic circuits and devices.

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“…In order to qualitatively investigate the polarization dependence of the extinction features seen in the transmission spectra of Fig. 2, we have constructed EELS maps for the 5 nm film samples by integrating the EEL spectra in the 1.8-2.0 eV energy range, as seen in 51 . The electron beam in EELS is able to excite plasmon modes that are normally inaccessible with optical fields 52 , and is also able to excite all different polarizations simultaneously 39,46 .…”

Section: Resultsmentioning

confidence: 99%

Optical reconfiguration and polarization control in semi-continuous gold films close to the percolation threshold

et al. 2017

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Controlling and confining light by exciting plasmons in resonant metallic nanostructures is an essential aspect of many new emerging optical technologies. Here we explore the possibility of controllably reconfiguring the intrinsic optical properties of semi-continuous gold films, by inducing permanent morphological changes with a femtosecond (fs)-pulsed laser above a critical power. Optical transmission spectroscopy measurements show a correlation between the spectra of the morphologically modified films and the wavelength, polarization, and the intensity of the laser used for alteration. In order to understand the modifications induced by 1 arXiv:1704.08550v1 [physics.optics] 27 Apr 2017 the laser writing, we explore the near-field properties of these films with electron energy-loss spectroscopy (EELS). A comparison between our experimental data and full-wave simulations on the exact film morphologies hints toward a restructuring of the intrinsic plasmonic eigenmodes of the metallic film by photothermal effects. We explain these optical changes with a simple model and demonstrate experimentally that laser writing can be used to controllably modify the optical properties of these semi-continuous films. These metal films offer an easy-to-fabricate and scalable platform for technological applications such as molecular sensing and ultra-dense data storage.

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Comparison of electron energy-loss and quantitative optical spectroscopy on individual optical gold antennas

Cited by 15 publications

References 15 publications

Angular-resolved electron energy loss spectroscopy on a split-ring resonator

Angular-resolved electron energy loss spectroscopy on a split-ring resonator

Extremely confined gap surface-plasmon modes excited by electrons

Optical reconfiguration and polarization control in semi-continuous gold films close to the percolation threshold

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