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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 15 — Jul. 21, 2008
  • pp: 11203–11215

Antenna-mediated back-scattering efficiency in infrared near-field microscopy

M. Brehm, A. Schliesser, F. Čajko, I. Tsukerman, and F. Keilmann  »View Author Affiliations

Optics Express, Vol. 16, Issue 15, pp. 11203-11215 (2008)

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We evaluate the efficiency of back-scattering, η B , from a standard cantilevered AFM probe contacting a flat sample, and also the back-scattering phase. Both quantities are spectroscopically determined over a broad 9-12 μm wavelength range by coherent frequency-comb Fourier-transform spectroscopy (c-FTIR). While Fresnel reflectivity contributes a key factor with the SiC Reststrahlen edge at 975 cm-1 as previously documented, we observe spectral effects ascribable to antenna resonances involving the shaft, cantilever, and sample. Most conspicuous is strong (η B = 13%), resonant back-scattering at 955 cm-1, a frequency that suggests the involvement of surface-phonon-polariton excitation, when the tip probes the area near a SiC/Au boundary. The probe’s antenna properties are elucidated by numerically simulating the near fields, the fields in the radiation zone, and the far-field scattering distributions. The simulations are performed for a realistic tip/sample configuration with a three-orders-of-magnitude scale variation. The results suggest a standing-surface-plasmon-polariton pattern along the shaft, as well as far-field antenna lobes that change with the sample’s dielectric properties.

© 2008 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:

Original Manuscript: May 21, 2008
Revised Manuscript: June 23, 2008
Manuscript Accepted: June 23, 2008
Published: July 11, 2008

Virtual Issues
Vol. 3, Iss. 8 Virtual Journal for Biomedical Optics

M. Brehm, A. Schliesser, F. Cajko, I. Tsukerman, and F. Keilmann, "Antenna-mediated back-scattering efficiency in infrared near-field microscopy," Opt. Express 16, 11203-11215 (2008)

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