Hybrid terahertz plasmonic waveguide for sensing applications

Borwen You, Ja Yu Lu, Tze An Liu, Jin Long Peng

研究成果: Article同行評審

39 引文 斯高帕斯(Scopus)


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.

頁(從 - 到)21087-21096
期刊Optics Express
出版狀態Published - 2013 9月 9

All Science Journal Classification (ASJC) codes

  • 原子與分子物理與光學


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