Selective Coherent Anti-Stokes Raman Scattering Microscopy Employing Dual-Wavelength Nanofocused Ultrafast Plasmon Pulses

Keita Tomita, Yasuhiro Kojima, Fumihiko Kannari

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Ultrafast surface plasmon polariton (SPP) nanofocusing on a plasmonic metal tapered tip with femtosecond laser pulses enables background-free localized excitation beyond the diffraction limit. We demonstrate simultaneous nanofocusing of ultrafast SPP pulses at 440 and 800 nm, which were coupled with a common diffraction grating structure fabricated on an aluminum (Al) tapered tip, to the tip apex with a radius of ?35 nm. We achieved selective coherent anti-Stokes Raman scattering (CARS) microscopy that combined an 800 nm (ω) SPP pump pulse, which achieves selective vibrational excitation by spectral focusing, and a 440 nm (2ω) SPP probe pulse. Raman intensity of this novel 2ω-CARS increased by a factor of 3.96 at the G-band and 4.00 at the 2D-band compared with that with ω-CARS for the monolayer graphene. The 2ω-CARS imaging method was applied for imaging a multiwalled carbon nanotube at the D-, G-, and 2D-bands. This dual-wavelength nanofocusing will open up new nanoscale microspectroscopy and optical excitation at the tip apex, such as sum frequency mixing, two-photon excitation.

Original languageEnglish
Pages (from-to)1366-1372
Number of pages7
JournalNano Letters
Volume18
Issue number2
DOIs
Publication statusPublished - 2018 Feb 14

Fingerprint

polaritons
Raman scattering
Microscopic examination
Raman spectra
microscopy
Wavelength
pulses
wavelengths
excitation
apexes
Imaging techniques
Graphite
Multiwalled carbon nanotubes (MWCN)
Photoexcitation
Diffraction gratings
gratings (spectra)
Ultrashort pulses
Aluminum
Graphene
Monolayers

Keywords

  • coherent anti-Stokes Raman scattering
  • nanofocusing
  • nonlinear microscopy
  • pulse shaping
  • Surface plasmon polaritons

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Selective Coherent Anti-Stokes Raman Scattering Microscopy Employing Dual-Wavelength Nanofocused Ultrafast Plasmon Pulses. / Tomita, Keita; Kojima, Yasuhiro; Kannari, Fumihiko.

In: Nano Letters, Vol. 18, No. 2, 14.02.2018, p. 1366-1372.

Research output: Contribution to journalArticle

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