On the concept of imaging nanoscale vector fields

Lee, K. G.; Kihm, H. W.; Kihm, J. E.; Choi, Wonshik; Kim, H.; Ropers, Claus; Park, D. J.; Yoon, Y. C.; Choi, Soo Bong; Woo, Deok Ha; Kim, J.; Lee, B.; Park, Q. H.; Lienau, Christoph; Kim, D. S.

doi:10.1038/nphoton.2007.68b

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…It has been reported that a circularly apertured fiber tip collects the in-plane electric field component E x perpendicular to the slit axis and magnetic field H y along the slit axis with approximately the same efficiency. [26,30,31] We therefore assumed an equal coupling ratio for E x and H y , such that the collected intensity is proportional to The transmitted near-field intensity I(x) calculated in this way is shown in Fig. 5 (top) and (bottom) as dashed red lines, together, for Δφ=0 and -π, respectively, and is in satisfactory agreement with the experimental data (black solid lines).…”

Section: Spectrum Domain Study Of Spp Generation In Nanoslit Arraysupporting

confidence: 64%

Femtosecond phase control of spatial localization of the optical near-field in a metal nanoslit array

Choi¹,

Park²,

Lienau³

et al. 2008

Opt. Express

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We demonstrate spatial control of optical near-fields by femtosecond phase shaping in one-dimensional plasmonic structures. The near-field images display striking temporal-phase dependence, switching between double- and single-peak images within one lattice constant. The change of the near-field distribution is studied in the time and spectral domain. The spectral composition change observed by varying the time delay between two phase-locked femtosecond pulses explains the spatial control of the near-field images. Modal expansion calculations of linear light transmission using the surface impedance boundary condition are in excellent agreement with experiments.

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Section: Spectrum Domain Study Of Spp Generation In Nanoslit Arraysupporting

confidence: 64%

Femtosecond phase control of spatial localization of the optical near-field in a metal nanoslit array

Choi¹,

Park²,

Lienau³

et al. 2008

Opt. Express

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“…This is required for symmetry-selective probing in TERS and other nonlinear tip-enhanced processes [163][164][165] (Neacsu et al, unpublished manuscript) that rely on polarization selective and conserving light scattering. In contrast, for a Ag-particle-topped quartz AFM probe as used for probing the 520-cm −1 Raman band of Si [166], the observed Raman depolarization has been attributed to the wide cone angle of the tip [119].…”

Section: Experimental Quantification Of the Near-field Raman Enhancementmentioning

confidence: 99%

“…The highly polarized TER response observed in our experiments indicates the absence of significant near-field depolarization, for the homogeneous and slender tip geometries used. This is required for symmetry selective probing in TERS and other nonlinear tip-enhanced processes [167,168,169,170] that rely on polarization selective and conserving light scattering. In contrast, for a Ag particletopped quartz AFM probe as used for probing the 520 cm −1 Raman band of Si [171] the observed Raman depolarization has been attributed to the wide cone angle of the tip [119].…”

Section: Experimental Quantification Of the Near-field Raman Enhancementmentioning

confidence: 99%

Tip-Enhanced Raman Imaging and Nanospectroscopy: Sensitivity, Symmetry, and Selection Rules

2007

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The fundamental mechanisms of tipenhanced Raman spectroscopy (TERS) have been investigated, including the role of the plasmonic excitation of the metallic tips, the nature of the optical tip-sample coupling, and the resulting local-field enhancement and confinement responsible for ultrahigh resolution imaging down to just several nanometers. Criteria for the distinction of near-field signature from far-field imaging artifacts are addressed. TERS results of molecules are presented. With enhancement factors as high as 10 9 , single-molecule spectroscopy is demonstrated. Spatially resolved vibrational mapping of crystalline nanostructures and determination of crystallographic orientation and domains is discussed making use of the symmetry properties of the tip scattering response and the intrinsic Raman selection rules.

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“…A lens (focal length of 5 cm) focuses the excitation beam at the slit position to eliminate the position dependent interference between the directly transmitted light through the thin metal film and the propagating SPP at the tip position. The tip is fixed at one selected x-position at about 50 μm a w a y f r o m t h e s l i t e x i t t o d i m i n i s h u n w a n t e d backgrounds resulting from the deflected light at the tip shaft when the propagating light transmitted at the slit position touches the tip surface (Lee et al, 2007b). from the bottom side of the sample to generate SPPs propagating in ± x-direction on air-gold interface.…”

Section: Wwwintechopencommentioning

confidence: 99%

“…In addition, it is needed to study the energy transfer between the tapered glass tip and the metallic structures attached to the end of it, depending on the material and on the structural shape. From (Lee et al, 2007b). © 2007 Nature Publishing Group.…”

Section: Problems and Outlookmentioning

confidence: 99%