摘要
An optical platform for sensitive detection of chemical vapor based on a polymer-coated symmetrical metal-cladding waveguide is proposed.The diffusion of chemical vapor usually leads to a combinational effect in the polymer layer,i.e.,swelling and refractive index change.Owing to the high sensitivity of ultrahigh-order modes,the vapor-induced effect will give rise to a dramatic variation of the reflected light intensity.For proof-of-concept,a good linearity and a low detection limit of toluene and benzene are experimentally demonstrated with an amorphous Teflon AF polymer layer.
An optical platform for sensitive detection of chemical vapor based on a polymer-coated symmetrical metal-cladding waveguide is proposed. The diffusion of chemical vapor usually leads to a combinational effect in the polymer layer, i.e., swelling and refractive index change. Owing to the high sensitivity of ultrahigh-order modes, the vapor-induced effect will give rise to a dramatic variation of the reflected light intensity. For proof-of-concept, a good linearity and a low detection limit of toluene and benzene are experimentally demonstrated with an amorphous Teflon AF polymer layer.
基金
supported by the National Natural Science Foundation of China (Grant No. 61168002)
the Opening Foundation of the State Key Laboratory of Advanced Optical Communication Systems and Networks(Grant No. 2011GZKF031105)
关键词
金属包层
高灵敏度
聚合物
检测限
汽相
化学
波导
对称
chemical vapor detection
polymer layer
symmetrical metal-cladding waveguide
ultrahigh-order mode
