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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 7 — Jul. 27, 2011

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)
http://dx.doi.org/10.1364/OE.19.012469


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Abstract

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:
Spectroscopy

History
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

Citation
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)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-19-13-12469


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