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, Jin Long Peng

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


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/mm 2. A double-layered Fabry-Pérot model is proposed for calculating the overlayer thicknesses, which agrees well with the experimental results.

Original languageEnglish
Pages (from-to)19353-19360
Number of pages8
JournalOptics Express
Issue number18
Publication statusPublished - 2010 Aug 30

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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