Acta Optica Sinica, Volume. 33, Issue 2, 228004(2013)
Effect of Diectric-Layer Parameter Coated on Microtube Inner Wall Surface on Optofluidics Biosensor Sensitivity
The sensitivity enhancement effect of microtube coated with a dielectric layer on the inner surface is presented. The simulations of mode-field distribution and senstivity are carried out for thin wall microtubes and thick wall microtubes with an established four-layer ring structure model. The results show that optical field energy in the core of the microtube can be increased when a dielectric layer with high refractive index is coated on the inner wall surface of the microtube, thus the sensitivity is enhanced. The sensitivity of the 1st-order radial mode of the thin wall microtube and the high-order radial mode of the thick wall microtube are enhanced by 65 and 302 times, respectively. The refractive-index sensing sensitivity of the high-order radial mode will experience multiple peaks accompanying with the thickness change of the dielectric layer, which is analyzed from the view of geometrical optics.
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Ji Qiang, Jiang Junfeng, Liu Tiegen, Liu Kun, Liu Wenhui, Zhang Jing, Chen Wenjie. Effect of Diectric-Layer Parameter Coated on Microtube Inner Wall Surface on Optofluidics Biosensor Sensitivity[J]. Acta Optica Sinica, 2013, 33(2): 228004
Category: Remote Sensing and Sensors
Received: Sep. 10, 2012
Accepted: --
Published Online: Dec. 31, 2012
The Author Email: Qiang Ji (jiqiangyangzi@163.com)