標題: A terahertz plastic wire based evanescent field sensor for high sensitivity liquid detection
作者: You, Borwen
Liu, Tze-An
Peng, Jin-Long
Pan, Ci-Ling
Lu, Ja-Yu
光電工程學系
Department of Photonics
公開日期: 9-十一月-2009
摘要: A highly sensitive detection method based on the evanescent wave of a terahertz subwavelength plastic wire was demonstrated for liquid sensing. Terahertz power spreading outside the wire core makes the waveguide dispersion sensitive to the cladding index variation, resulting in a considerable deviation of waveguide dispersion. Two liquids with transparent appearances, water and alcohol, are easily distinguished based on the waveguide dispersion, which is consistent with theoretical predictions. A melamine alcohol solution with various concentrations is identified successfully, and the detection limit is up to 20ppm, i.e. equivalent to the index variation on the order of 0.01. (C) 2009 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.17.020675
http://hdl.handle.net/11536/6435
ISSN: 1094-4087
DOI: 10.1364/OE.17.020675
期刊: OPTICS EXPRESS
Volume: 17
Issue: 23
起始頁: 20675
結束頁: 20683
顯示於類別:期刊論文