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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 5858–5866

Terahertz refractive index sensors using dielectric pipe waveguides

Borwen You, Ja-Yu Lu, Chin-Ping Yu, Tze-An Liu, and Jin-Long Peng  »View Author Affiliations

Optics Express, Vol. 20, Issue 6, pp. 5858-5866 (2012)

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A dielectric pipe waveguide is successfully demonstrated as a terahertz refractive index sensor for powder and liquid-vapor sensing. Without additional engineered structures, a simple pipe waveguide can act as a terahertz resonator based on anti-resonant reflecting guidance, forming multiple resonant transmission-dips. Loading various powders in the ring-cladding or inserting different vapors into the hollow core of the pipe waveguide leads to a significant shift of resonant frequency, and the spectral shift is related to the refractive-index change. The proven detection limit of molecular density could be reduced to 1.6nano-mole/mm3 and the highest sensitivity is demonstrated at around 22.2GHz/refractive-index-unit (RIU), which is comparable to the best THz molecular sensor [Appl. Phys. Lett. 95, 171113 (2009)].

© 2012 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: November 23, 2011
Revised Manuscript: January 23, 2012
Manuscript Accepted: February 21, 2012
Published: February 27, 2012

Borwen You, Ja-Yu Lu, Chin-Ping Yu, Tze-An Liu, and Jin-Long Peng, "Terahertz refractive index sensors using dielectric pipe waveguides," Opt. Express 20, 5858-5866 (2012)

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