Near-field optical imaging of noble metal nanoparticles

Wiederrecht, Gary P.

doi:10.1051/epjap:2004170

Cited by 78 publications

(57 citation statements)

References 106 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…15 A promising method to access both local amplitude and phase relies on near-field optical methods that have progressively succeeded in imaging nanoscale field patterns in metallic particles ͑optical nanoantennas͒. [16][17][18] In particular, scattering-type scanning near-field optical microscopy ͑s-SNOM͒ ͑Ref. 19͒ has managed to map both the local amplitude and phase of the plasmon modes by interferometric detection of the antenna fields scattered by a scanning atomic force microscope tip.…”

mentioning

confidence: 99%

Influence of the tip in near-field imaging of nanoparticle plasmonic modes: Weak and strong coupling regimes

García‐Etxarri

Romero

Abajo³

et al. 2009

Phys. Rev. B

118

103

View full text Add to dashboard Cite

We identify weak and strong coupling regimes between a near-field probing tip and a plasmonic sample by imaging plasmon-resonant gold nanodisks with scattering-type scanning near-field optical microscopy ͑s-SNOM͒. By means of rigorous electrodynamical calculations based on a model system, we find that in the weak coupling regime, s-SNOM can be applied for direct mapping of plasmonic nanoantenna modes, while in the strong coupling regime, the near-field probe allows for high-precision opto-mechanical control of the antenna response. DOI: 10.1103/PhysRevB.79.125439 PACS number͑s͒: 73.20.Mf, 78.67.Ϫn Surface plasmons in metallic nanoparticles have become a powerful driving force in the scientific and technological development of nanooptics. [1][2][3] The ability of plasmons to act as the interface between far-field radiation and nanoscale confined near fields has generated promising prospects in plasmon-enhanced spectroscopy, 4 optical nanoimaging, 5 electromagnetic signal guiding, 6,7 and biosensing applications, 8,9 among others. The potential of surface plasmons to decay radiatively, as well as nonradiatively, depending on the particular conformation and environment around them is the basis for most of these applications. In spite of the general and straightforward techniques available to obtain information on the far-field radiation by a surface plasmon such as in dark-field optical spectroscopy, 10 the amplitude and phase of its near field is still more than a challenge to access. Electron-energy-loss spectroscopy for example has provided a tool for spatial mapping of the plasmon modes with unprecedent resolution, 11 but it only provides information on the amplitude of the modes. However, in nanophotonics it is often the local near-field phase that is of extreme importance, as for example in coherent control applications, 12 in nanoantenna-assisted molecular emission 13 and spectroscopy, 14 and in plasmon dynamics of complex metallic systems. 15 A promising method to access both local amplitude and phase relies on near-field optical methods that have progressively succeeded in imaging nanoscale field patterns in metallic particles ͑optical nanoantennas͒. [16][17][18] In particular, scattering-type scanning near-field optical microscopy ͑s-SNOM͒ ͑Ref. 19͒ has managed to map both the local amplitude and phase of the plasmon modes by interferometric detection of the antenna fields scattered by a scanning atomic force microscope tip. [20][21][22][23][24] However, the antenna optical response is extremely sensitive to environmental changes, 5,8,9 thus the process of measurement of its near field may result in the modification of the antenna modes, similar to probe-induced modifications in other nanophotonic systems. [25][26][27][28] In this work we address this issue, presenting a basic understanding of the near-field coupling between s-SNOM probes and plasmonic nanoantennas ͑here gold nanodisks͒. We find that weak dielectric probes allow for plasmon mode mapping, whereas metallic probes introduce substantial m...

show abstract

mentioning

confidence: 99%

Influence of the tip in near-field imaging of nanoparticle plasmonic modes: Weak and strong coupling regimes

García‐Etxarri

Romero

Abajo³

et al. 2009

Phys. Rev. B

118

103

View full text Add to dashboard Cite

show abstract

“…In sum, except for the better laser excitation and signal collection efficiencies (60 º incident angle and p-polarization excitation), the sample needs not be transparent. In contrast, for s-SNOM with a transmission-illumination geometry  in which the excitation laser beam illuminates the tip apex through the sample and along the tip shaft, transparent samples are must and furthermore a special polarization configuration is prepared for the excitation beam to enhance the field component at the tip apex along the tip shaft [35][36][37]. Nevertheless, for the side-illumination geometry, the cantilever that holds the tip shaft cannot obstruct the excitation laser beam from irradiating the tip apex.…”

Section: Extracting Near-field Imagesmentioning

confidence: 99%

High-Resolution Near-Field Optical Microscopy: A Sub-10 Nanometer Probe for Surface Electromagnetic Field and Local Dielectric Trait

Chu¹,

Wang²

2012

Advanced Photonic Sciences

View full text Add to dashboard Cite

“…Examples of material contrast obtained through sample resonances are discussed in the literature, and the reader is referred to the reviews of Wiederrecht (2004) and Keilmann and Hillenbrand (2004).…”

Section: Introductionmentioning

confidence: 99%

Field‐enhanced scanning near‐field optical microscopy

Bouhélier

2006

Microscopy Res & Technique

View full text Add to dashboard Cite

This manuscript reviews the principles and recent advances of scanning near-field optical microscopy based on tip-induced field enhancement. These scanning microscopes utilize minute probes to locally enhance an electromagnetic field through a complex interplay between surface plasmon excitation and localization of electric charges by geometrical singularities. The necessary conditions leading to an electromagnetic enhancement will be reviewed, as well as the means to characterize it. A brief account of the theoretical framework will be given, together with applications of the technique ranging from chemical imaging to nanolithography.

show abstract

Near-field optical imaging of noble metal nanoparticles

Cited by 78 publications

References 106 publications

Influence of the tip in near-field imaging of nanoparticle plasmonic modes: Weak and strong coupling regimes

Influence of the tip in near-field imaging of nanoparticle plasmonic modes: Weak and strong coupling regimes

High-Resolution Near-Field Optical Microscopy: A Sub-10 Nanometer Probe for Surface Electromagnetic Field and Local Dielectric Trait

Field‐enhanced scanning near‐field optical microscopy

Contact Info

Product

Resources

About