Subwavelength film sensing based on terahertz anti-resonant reflecting hollow waveguides
| Autor: | Hao Zai Chen, Borwen You, Chin-Ping Yu, Jin Long Peng, Jia Hong Liou, Tze An Liu, Ja-Yu Lu |
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| Rok vydání: | 2010 |
| Předmět: |
Optics and Photonics
Optical fiber Materials science Time Factors Terahertz radiation Acrylic Resins Dielectric Biosensing Techniques Polypropylenes Overlayer law.invention Optics law Fiber Optic Technology Anisotropy Optical Fibers Terahertz Spectroscopy Models Statistical business.industry Reproducibility of Results Atomic and Molecular Physics and Optics Terahertz spectroscopy and technology Interferometry Surface wave Optoelectronics Polyvinyls business Refractive index Algorithms |
| Zdroj: | Optics express. 18(18) |
| ISSN: | 1094-4087 |
| Popis: | 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 0.003 mm/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 1.22 picomole/mm(2). A double-layered Fabry-Perot model is proposed for calculating the overlayer thicknesses, which agrees well with the experimental results. |
| Databáze: | OpenAIRE |
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