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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 2 — Jan. 27, 2014
  • pp: 1330–1335

Stabilization method for signal drifts in terahertz chemical microscopy

Toshihiko Kiwa, Kenji Sakai, and Keiji Tsukada  »View Author Affiliations

Optics Express, Vol. 22, Issue 2, pp. 1330-1335 (2014)

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A stabilization method for signal drifts in terahertz chemical microscopy (TCM) due to unexpected chemical potential changes in sample solutions was proposed and developed. The sensing plate was separated into two areas: a detection area and a control area. The detection area radiated a THz pulse whose amplitude was related to both the chemical reactions in the sample solutions and unexpected potential changes. The THz pulse from the control area was related only to unexpected potential changes. In the proposed system, the THz pulse from each area was interfered and detected. By adjusting the timing of the positive peak of the THz pulse from the detection area and the negative peak of the THz pulse from the control area, we detected the difference in both peaks as the interference signal. Thus, the signal deviation of 390 when the environmental condition changes in the temperature range of 38 °C and the pH range of 8.33 was stabilized to be the signal deviation of 31. As the result, the TCM with stabilization method could detect the signal shift of 121 when the 275-nmol/L immunoglobulin G was immobilized on the sensing plate.

© 2014 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(320.7160) Ultrafast optics : Ultrafast technology
(170.6795) Medical optics and biotechnology : Terahertz imaging

ToC Category:
Terahertz Optics

Original Manuscript: September 13, 2013
Revised Manuscript: November 24, 2013
Manuscript Accepted: December 2, 2013
Published: January 14, 2014

Virtual Issues
Vol. 9, Iss. 3 Virtual Journal for Biomedical Optics

Toshihiko Kiwa, Kenji Sakai, and Keiji Tsukada, "Stabilization method for signal drifts in terahertz chemical microscopy," Opt. Express 22, 1330-1335 (2014)

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