Subnanometric Near-Field Raman Investigation in the Vicinity of a Metallic Nanostructure

Ichimura, Taro; Fujii, Shintaro; Verma, Prabhat; Yano, Taka-aki; Inouye, Yasushi; Kawata, Satoshi

doi:10.1103/physrevlett.102.186101

Cited by 102 publications

(103 citation statements)

References 22 publications

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“…Kawata and colleagues, to generate high-resolution TERS images, demonstrated an interesting time-gated approach. With the AFM used for TERS operating in tapping mode and locked in on the oscillation frequency, they were able to image carbon nanotubes with nanometer spatial resolution [6]. This was possible due to the electric field being confined to a region within 3 nm of the tip.…”

Section: Experimental Ters Configurationsmentioning

confidence: 96%

“…Since the initial demonstration of tip-enhanced Raman scattering (TERS) more than a decade ago [1][2][3], significant progress has been made in our understanding of the mechanisms that give rise to these enhancements and also the utilization of these enhancements in a variety of applications. Some of the most impressive results include single nanometer resolution and single molecule detection [4][5][6][7]. A variety of different experimental configurations have been developed to address different chemical questions.…”

Section: Introductionmentioning

confidence: 99%

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Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

2014

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Tip enhanced Raman scattering (TERS) is an emerging technique that uses a metalized scanning probe microscope tip to spatially localize electric fields that enhances Raman scattering enabling chemical imaging on nanometer dimensions. Arising from the same principles as surface enhanced Raman scattering (SERS), TERS offers unique advantages associated with controling the size, shape, and location of the enhancing nanostructure. In this article we discuss the correlations between current understanding of SERS and how this relates to TERS, as well as how TERS provides new understanding and insights. The relationship between plasmon resonances and Raman enhancements is emphasized as the key to obtaining optimal TERS results. Applications of TERS, including chemical analysis of carbon nanotubes, organic molecules, inorganic crystals, nucleic acids, proteins, cells and organisms, are used to illustrate the information that can be gained. Under ideal conditions TERS is capable of single molecule sensitivity and sub-nanometer spatial resolution. The ability to control plasmonic enhancements for chemical analysis suggests new experiments and opportunities to understand molecular composition and interactions on the nanoscale.

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Section: Experimental Ters Configurationsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

2014

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“…The lateral resolution drastically improved from <100 nm of the initial studies down to the current single-molecule scale [23,24]. Developed techniques have been applied not only to single-molecule imaging [25], but also to the investigation of the phonon structure of an ultrasmall crystalline boundary [26], single-molecule switching [27], distribution of the electromagnetic field of a single metal nanorod, [28] and dynamics of vibration in an ultrashort timescale [29]. In a well-controlled ultrahigh vacuum environment at low temperature (<10…”

Section: Single-site Sers For Single-molecule Observationmentioning

confidence: 99%

Single-site surface-enhanced Raman scattering beyond spectroscopy

2016

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Recent progress in the observation of surface-enhanced Raman scattering (SERS) is reviewed to examine the possibility of finding a novel route for the effective photoexcitation of materials. The importance of well-controlled SERS experiments on a single molecule at a single site is discussed based on the difference in the information obtained from ensemble SERS measurements using multiple active sites with an uncontrolled number of molecules. A single-molecule SERS observation performed at a mechanically controllable breaking junction with a simultaneous conductivity measurement provides clear evidence of the drastic changes both in the intensity and in the Raman mode selectivity of the electromagnetic field generated by localized surface plasmon resonance. Careful control of the field at a few-nanometer-wide gap of a metal nanodimer results in the modification of the selection rule of electronic excitation of an isolated single-walled carbon nanotube. The examples shown in this review suggest that a single-site SERS observation could be used as a novel tool to find, develop, and implement applications of plasmon-induced photoexcitation of materials.

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“…Conventional SPP excitation schemes for NSOM measurements include prism coupling (Kreschtmann configuration) [56], grating coupling [72], NSOM probe coupling [73], and interactions between a metallic probe and a sample [71]. As introduced in Section 2, the stepgap leakage SPP generation scheme provides a controllable localized SPP source for NSOM probes, without strict requirements on the incident light source.…”

Section: Near-field Scanning Optical Microscopy (Nsom) Is a Powerful mentioning

confidence: 99%

“…Uncoated optical fiber probes can be made to 80 nm in diameter [70], and aperture probes typically have 40 nm-diameter aperture sizes [60]. Some reports showed that the resolution can be as high as 15 nm in the case of metallic probes [71].…”

Section: Near-field Scanning Optical Microscopy (Nsom) Is a Powerful mentioning

confidence: 99%

Optical and electrical mappings of surface plasmon cavity modes

et al. 2014

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Plasmonics is a rapidly expanding field, founded in physics but now with a growing number of applications in biology (biosensing), nanophotonics, photovoltaics, optical engineering and advanced information technology. Appearing as charge density oscillations along a metal surface, excited by electromagnetic radiation (e.g., light), plasmons can propagate as surface plasmon polaritons, or can be confined as standing waves along an appropriately-prepared surface. Here, we review the latter manifestation, both their origins and the manners in which they are detected, the latter dominated by near field scanning optical microscopy (NSOM/SNOM). We include discussion of the "plasmonic halo" effect recently observed by the authors, wherein cavity-confined plasmons are able to modulate optical transmission through step-gap nanostructures, yielding a novel form of color (wavelength) selection.

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Subnanometric Near-Field Raman Investigation in the Vicinity of a Metallic Nanostructure

Cited by 102 publications

References 22 publications

Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

Single-site surface-enhanced Raman scattering beyond spectroscopy

Optical and electrical mappings of surface plasmon cavity modes

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