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 journalArticle

32 Citations (Scopus)

Abstract

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
Volume18
Issue number18
DOIs
Publication statusPublished - 2010 Aug 30

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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    You, B., Lu, J-Y., Liou, J. H., Yu, C. P., Chen, H. Z., Liu, T. A., & Peng, J. L. (2010). Subwavelength film sensing based on terahertz anti-resonant reflecting hollow waveguides. Optics Express, 18(18), 19353-19360. https://doi.org/10.1364/OE.18.019353