Terahertz refractive index sensors using dielectric pipe waveguides

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

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


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 ringcladding 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)].

Original languageEnglish
Pages (from-to)5858-5866
Number of pages9
JournalOptics Express
Issue number6
Publication statusPublished - 2012 Mar 12

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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