期刊
NANO LETTERS
卷 18, 期 2, 页码 1366-1372出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b05078
关键词
Surface plasmon polaritons; nanofocusing; coherent anti-Stokes Raman scattering; pulse shaping; nonlinear microscopy
类别
资金
- Ministry of Education, Culture, Sports, Science, and Technology, Japan
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 similar to 35 nm. We achieved selective coherent anti-Stokes Raman scattering (CARS) microscopy that combined an 800 nm (omega) SPP pump pulse, which achieves selective vibrational excitation by spectral focusing, and a 440 nm (2 omega) SPP probe pulse. Raman intensity of this novel 2 omega-CARS increased by a factor of 3.96 at the G-band and 4.00 at the 2D-band compared with that with omega-CARS for the monolayer graphene. The 2 omega-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.
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