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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 2 — Mar. 4, 2013

Scanning near-field optical coherent anti-Stokes Raman microscopy (SNOM-CARS) with femtosecond laser pulses in vibrational and electronic resonance

Mahesh Namboodiri, Tahir Zeb Khan, Sidhant Bom, Günter Flachenecker, and Arnulf Materny  »View Author Affiliations

Optics Express, Vol. 21, Issue 1, pp. 918-926 (2013)

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Accessing ultrafast photoinduced molecular dynamics on a femtosecond time-scale with vibrational selectivity and at the same time sub-diffraction limited spatial resolution would help to gain important information about ultrafast processes in nanostructures. While nonlinear Raman techniques have been used to obtain highly resolved images in combination with near-field microscopy, the use of femtosecond laser pulses in electronic resonance still constitutes a big challenge. Here, we present our first results on coherent anti-Stokes Raman scattering (fs-CARS) with femtosecond laser pulses detected in the near-field using scanning near-field optical microscopy (SNOM). We demonstrate that highly spatially resolved images can be obtained from poly(3-hexylthiophene) (P3HT) nano-structures where the fs-CARS process was in resonance with the P3HT absorption and with characteristic P3HT vibrational modes without destruction of the samples. Sub-diffraction limited lateral resolution is achieved. Especially the height resolution clearly surpasses that obtained with standard microCARS. These results will be the basis for future investigations of mode-selective dynamics in the near field.

© 2013 OSA

OCIS Codes
(300.6420) Spectroscopy : Spectroscopy, nonlinear
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(310.0310) Thin films : Thin films
(180.4243) Microscopy : Near-field microscopy

ToC Category:

Original Manuscript: October 9, 2012
Revised Manuscript: December 6, 2012
Manuscript Accepted: December 14, 2012
Published: January 9, 2013

Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics

Mahesh Namboodiri, Tahir Zeb Khan, Sidhant Bom, Günter Flachenecker, and Arnulf Materny, "Scanning near-field optical coherent anti-Stokes Raman microscopy (SNOM-CARS) with femtosecond laser pulses in vibrational and electronic resonance," Opt. Express 21, 918-926 (2013)

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