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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 18 — Aug. 30, 2010
  • pp: 19353–19360

Subwavelength film sensing based on terahertz anti-resonant reflecting hollow waveguides

Borwen You, Ja-Yu Lu, Jia-Hong Liou, Chin-Ping Yu, Hao-Zai Chen, Tze-An Liu, and Jin-Long Peng  »View Author Affiliations

Optics Express, Vol. 18, Issue 18, pp. 19353-19360 (2010)

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A simple dielectric hollow-tube has been experimentally demonstrated at terahertz range for bio-molecular layer sensing based on the anti-resonant reflecting wave-guidance mechanism. We experimentally study the dependence of thin-film detection sensitivity on the optical geometrical parameters of tubes, different thicknesses and tube wall refractive indices, and on different resonant frequencies. A polypropylene hollow-tube with optimized sensitivity of 0.003mm/μm is used to sense a subwavelength-thick (λ/225) carboxypolymethylene molecular overlayer on the tube’s inner surface, and the minimum detectable quantity of molecules could be down to 1.22picomole/mm2. A double-layered Fabry-Pérot model is proposed for calculating the overlayer thicknesses, which agrees well with the experimental results.

© 2010 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(130.6010) Integrated optics : Sensors
(230.7370) Optical devices : Waveguides
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:

Original Manuscript: July 14, 2010
Revised Manuscript: August 23, 2010
Manuscript Accepted: August 23, 2010
Published: August 26, 2010

Borwen You, Ja-Yu Lu, Jia-Hong Liou, Chin-Ping Yu, Hao-Zai Chen, Tze-An Liu, and Jin-Long Peng, "Subwavelength film sensing based on terahertz anti-resonant reflecting hollow waveguides," Opt. Express 18, 19353-19360 (2010)

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