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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 20 — Jul. 10, 2013
  • pp: 4877–4883

Sensing self-assembled alkanethiols by differential transmission interrogation with terahertz metamaterials

Xiaojun Wu, Baogang Quan, Xuecong Pan, Xinlong Xu, Xinchao Lu, Xiaoxiang Xia, Junjie Li, Changzhi Gu, and Li Wang  »View Author Affiliations


Applied Optics, Vol. 52, Issue 20, pp. 4877-4883 (2013)
http://dx.doi.org/10.1364/AO.52.004877


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Abstract

Surface-enhanced electromagnetic response in the resonant regions of split-ring resonators offers a sensitive way to probe the surface dipoles formed by alkanethiol molecules with a terahertz wave by a differential transmission (DT) interrogation method. The DT signal mainly comes from the interaction between alkanethiols and metamaterials by electron transfer and/or the variation of the dielectric constant. The Lorentz model is used to demonstrate the principle of DT interrogation theoretically, which suggests the variation of both frequency and damping of resonance can be captured cooperatively. This method has been employed to experimentally demonstrate the sensing feasibility for the chain length dependence of the alkanethiol molecules. Numerical simulations confirm that the enhancement is large at the gap and corner regions of this kind of metamaterials.

© 2013 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(160.3918) Materials : Metamaterials
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: April 12, 2013
Revised Manuscript: June 1, 2013
Manuscript Accepted: June 4, 2013
Published: July 5, 2013

Citation
Xiaojun Wu, Baogang Quan, Xuecong Pan, Xinlong Xu, Xinchao Lu, Xiaoxiang Xia, Junjie Li, Changzhi Gu, and Li Wang, "Sensing self-assembled alkanethiols by differential transmission interrogation with terahertz metamaterials," Appl. Opt. 52, 4877-4883 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-20-4877


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