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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 13 — Jun. 20, 2011
  • pp: 12469–12479

Modulated near-field spectral extraction of broadband mid-infrared signals with a ceramic light source

Michio Ishikawa, Makoto Katsura, Satoru Nakashima, Kento Aizawa, Tsutomu Inoue, Hidekazu Okamura, and Yuka Ikemoto  »View Author Affiliations

Optics Express, Vol. 19, Issue 13, pp. 12469-12479 (2011)

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In order to obtain broadband near-field infrared (IR) spectra, a Fourier-transform IR spectrometer (FT-IR) and a ceramic light source were used with a scattering-type scanning near-field optical microscope (s-SNOM). To suppress the background (far-field) scattering, the distance between the scattering probe and the sample was modulated with frequency Ω by a piezo-electric actuator, and the Ω component was extracted from the signal with a lock-in detection. With Ω=30 kHz, a peak-to-peak modulation amplitude of 198 nm, and a probe with smooth surface near the tip, broadband near-field IR spectra could be obtained in the 1200-2500 cm−1.

© 2011 OSA

OCIS Codes
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6340) Spectroscopy : Spectroscopy, infrared
(180.4243) Microscopy : Near-field microscopy

ToC Category:

Original Manuscript: April 18, 2011
Revised Manuscript: May 26, 2011
Manuscript Accepted: June 1, 2011
Published: June 13, 2011

Virtual Issues
Vol. 6, Iss. 7 Virtual Journal for Biomedical Optics

Michio Ishikawa, Makoto Katsura, Satoru Nakashima, Kento Aizawa, Tsutomu Inoue, Hidekazu Okamura, and Yuka Ikemoto, "Modulated near-field spectral extraction of broadband mid-infrared signals with a ceramic light source," Opt. Express 19, 12469-12479 (2011)

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