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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 12 — Dec. 18, 2006

Spectroscopic near-field microscopy using frequency combs in the mid-infrared

Markus Brehm, Albert Schliesser, and Fritz Keilmann  »View Author Affiliations


Optics Express, Vol. 14, Issue 23, pp. 11222-11233 (2006)
http://dx.doi.org/10.1364/OE.14.011222


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Abstract

We introduce a new concept of spectroscopic near-field optical microscopy that records broad infrared spectra at each pixel during scanning. Two coherent beams with harmonic frequency-comb spectra are employed, one for illuminating the scanning tip, the other as reference for multi-heterodyne detection of the scattered light. Our implementation yields 200 cm-1 wide amplitude and phase spectra centered at 950 cm-1 (this band can be tuned between 700 and 1400 cm-1). We introduce a new technique of background suppression enabled by the short, 10 µs “snapshot” acquisition of infrared spectra which allows time-resolving the tapping motion. Thus we demonstrate broad-band mid-infrared near-field imaging that is essentially free of background artefacts.

© 2006 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(240.6490) Optics at surfaces : Spectroscopy, surface
(290.1350) Scattering : Backscattering
(290.5870) Scattering : Scattering, Rayleigh
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6310) Spectroscopy : Spectroscopy, heterodyne

ToC Category:
Microscopy

History
Original Manuscript: August 1, 2006
Revised Manuscript: September 28, 2006
Manuscript Accepted: September 30, 2006
Published: November 13, 2006

Virtual Issues
Vol. 1, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Markus Brehm, Albert Schliesser, and Fritz Keilmann, "Spectroscopic near-field microscopy using frequency combs in the mid-infrared," Opt. Express 14, 11222-11233 (2006)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-14-23-11222


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