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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 18 — Sep. 9, 2013
  • pp: 21087–21096

Hybrid terahertz plasmonic waveguide for sensing applications

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


Optics Express, Vol. 21, Issue 18, pp. 21087-21096 (2013)
http://dx.doi.org/10.1364/OE.21.021087


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Abstract

The suitability of a terahertz plasmonic sensor for sensing applications is successfully demonstrated using a hybrid planar waveguide composed of a subwavelength plastic ribbon waveguide and a diffraction metal grating. The subwavelength-confined terahertz plasmons on the hybrid waveguide resonantly reflect from the periodic metal structure under phase-matched conditions and perform resonant transmission dips. The resonant plasmonic frequencies are found to be strongly dependent on the refractive indices and thicknesses of analytes laid on the hybrid planar waveguide. Both plastic films with varying thicknesses and granular analytes in different quantities are successfully identified according to the spectral shifts of resonant dips. An optimal refractive index sensitivity of 261 GHz per refractive index unit is achieved. Within localized and enhanced terahertz plasmonic fields, the minimum detectable optical path difference can be reduced to 2.7 μm corresponding to λ/289, and the minimum detectable amount of analytes in powdered form reaches 17.3 nano-mole/mm2. The sensing technique can be used to detect particles in a chemical reaction or monitor pollutants.

© 2013 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(130.2790) Integrated optics : Guided waves
(240.6690) Optics at surfaces : Surface waves
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Sensors

History
Original Manuscript: June 27, 2013
Revised Manuscript: August 13, 2013
Manuscript Accepted: August 17, 2013
Published: September 3, 2013

Virtual Issues
Vol. 8, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Borwen You, Ja-Yu Lu, Tze-An Liu, and Jin-Long Peng, "Hybrid terahertz plasmonic waveguide for sensing applications," Opt. Express 21, 21087-21096 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-18-21087


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