Mapping the electric field distribution of tightly focused cylindrical vector beams with gold nanorings

Fulmes, Julia; Gollmer, Dominik A.; Jäger, Sebastian; Schäfer, Christian; Horrer, Andreas; Zhang, D.; Adam, Pierre‐Michel; Meixner, Alfred J.; Kern, D. P.; Fleischer, Monika

doi:10.1364/oe.26.014982

Cited by 8 publications

(7 citation statements)

References 78 publications

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“…The pattern shape strongly depends on the excitation wavelength and excitation doughnut mode. Even though both the TPR mode and interband transitions can be excited by 530 nm photons, we can exclude that TPR excitation significantly contributes to the PL emission, since the pattern shapes indicate an isotropic excitation and reflect the electric field distribution of the focused beam . One might argue that LPR could also be excited directly by the 530 nm laser and thus cause an isotropic excitation pattern.…”

Section: Resultsmentioning

confidence: 98%

Revealing the Three-Dimensional Orientation and Interplay between Plasmons and Interband Transitions for Single Gold Bipyramids by Photoluminescence Excitation Pattern Imaging

Liu

Wackenhut

et al. 2021

J. Phys. Chem. C

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Gold bipyramids (AuBPs) attract significant attention due to the large enhancement of the electric field around their sharp tips and well-defined tunability of their plasmon resonances. Excitation patterns of single AuBPs are recorded using raster-scanning confocal microscopy combined with radially and azimuthally polarized laser beams. Photoluminescence spectra (PL) and excitation patterns of the same AuBPs are acquired with three different excitation wavelengths. The isotropic excitation patterns suggest that the AuBPs are mainly excited by interband transitions with 488/530 nm radiation, while excitation patterns created with a 633 nm laser exhibit a double-lobed shape that indicates a single-dipole excitation process associated with the longitudinal plasmon resonance mode. We are able to determine the three-dimensional orientation of single AuBPs nonperturbatively by comparing experimental patterns with theoretical simulations. The asymmetric patterns show that the AuBPs are lying on the substrate with an out-of-plane tilt angle of around 10−15°.

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Section: Resultsmentioning

confidence: 98%

Revealing the Three-Dimensional Orientation and Interplay between Plasmons and Interband Transitions for Single Gold Bipyramids by Photoluminescence Excitation Pattern Imaging

Liu

Wackenhut

et al. 2021

J. Phys. Chem. C

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“…VLS nanowire growth is carried out in a quartz tube furnace with precursor gas mixture of H2 (270 sccm) and of SiH4 (30 sccm), at a pressure of 100 mbar. Silicon shell growth is done at a temperature of 520 °C with a gas mixture of H2 ( Using a home built parabolic mirror (NA: 0.998) [32] assisted setup, we achieve a diffraction-limited confocal resolution by illumination with a radially polarized laser beam [33]. With a 636.3 nm diode laser operating in continuous wave mode we obtain a focus diameter of roughly ~300 nm [34].…”

Section: Methodsmentioning

confidence: 99%

Revealing the local crystallinity of single silicon core-shell nanowires using tip-enhanced Raman spectroscopy

Berg¹,

Moeinian²,

Kobald³

et al. 2020

Preprint

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Tip-enhanced Raman spectroscopy is combined with polarization angle-resolved spectroscopy to investigate the nanometre-scale structural properties of core-shell silicon nanowires (crystalline Si core and amorphous Si shell), which were synthesized by platinum-catalyzed vapor-liquid-solid growth and silicon overcoating by thermal chemical vapour deposition. Local changes in the fraction of crystallinity are characterized for those silicon nanowires at an optical resolution of about 300 nm. Furthermore, we are able to resolve the variations in the intensity ratios between the crystalline Si and the amorphous Si Raman peaks by applying tip-enhanced Raman spectroscopy, at sample positions being eight nanometers apart. The local crystallinity revealed using confocal Raman spectroscopy and tip-enhanced Raman spectroscopy agree well with the high-resolution transmission electron microscopy measurements. Additionally, the polarizations of Raman scattering and the photoluminescence signal from the tip-sample nanogap are explored by combining polarization angle-resolved emission spectroscopy with tip-enhanced optical spectroscopy. Our work demonstrates the significant potential of resolving local structural properties of Si nanomaterials at the sub-10 nanometer scale using tip-enhanced Raman techniques.

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“…Using a custom-built setup with a parabolic mirror (NA: 0.998) [ 34 ], we achieve a diffraction-limited confocal resolution by illumination with a radially polarized laser beam [ 35 ]. With a 636.3 nm diode laser operating in continuous-wave mode we obtain a focus diameter of roughly 300 nm [ 36 ].…”

Section: Methodsmentioning

confidence: 99%

Revealing the local crystallinity of single silicon core–shell nanowires using tip-enhanced Raman spectroscopy

Berg¹,

Moeinian²,

Kobald³

et al. 2020

Beilstein J. Nanotechnol.

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Tip-enhanced Raman spectroscopy is combined with polarization angle-resolved spectroscopy to investigate the nanometer-scale structural properties of core–shell silicon nanowires (crystalline Si core and amorphous Si shell), which were synthesized by platinum-catalyzed vapor–liquid–solid growth and silicon overcoating by thermal chemical vapor deposition. Local changes in the fraction of crystallinity in these silicon nanowires are characterized at an optical resolution of about 300 nm. Furthermore, we are able to resolve the variations in the intensity ratios of the Raman peaks of crystalline Si and amorphous Si by applying tip-enhanced Raman spectroscopy, at sample positions being 8 nm apart. The local crystallinity revealed using confocal Raman spectroscopy and tip-enhanced Raman spectroscopy agrees well with the high-resolution transmission electron microscopy images. Additionally, the polarizations of Raman scattering and the photoluminescence signal from the tip–sample nanogap are explored by combining polarization angle-resolved emission spectroscopy with tip-enhanced optical spectroscopy. Our work demonstrates the significant potential of resolving local structural properties of Si nanomaterials at the sub-10 nanometer scale using tip-enhanced Raman techniques.

show abstract

Mapping the electric field distribution of tightly focused cylindrical vector beams with gold nanorings

Cited by 8 publications

References 78 publications

Revealing the Three-Dimensional Orientation and Interplay between Plasmons and Interband Transitions for Single Gold Bipyramids by Photoluminescence Excitation Pattern Imaging

Revealing the Three-Dimensional Orientation and Interplay between Plasmons and Interband Transitions for Single Gold Bipyramids by Photoluminescence Excitation Pattern Imaging

Revealing the local crystallinity of single silicon core-shell nanowires using tip-enhanced Raman spectroscopy

Revealing the local crystallinity of single silicon core–shell nanowires using tip-enhanced Raman spectroscopy

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