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    Mode field distribution of optical transmission along microfiber affected by CNT films with complex refraction index

    Year: 2012

    Journal: JOSA B, 2012, 29 (5), 891-895, 20131009

    Authors: Baicheng Yao, Yu Wu, Lan Jia, Yunjiang Rao, Yuan Gong, Chenying Jiang

    Organizations: Key Lab of Optical Fiber Sensing & Communications (Education Ministry of China), University of Electronic Science & Technology of China, Chengdu, Sichuan, 611731, China; School of Automation Engineering, University of Electronic Science & Technology of China, Chengdu, Sichuan, 611731, China

    Subwavelength diameter microfiber with carbon nanotube (CNT) cladding attracts wide attention for its significant effect on evanescent coupling and interaction. In this paper, the physical mechanism and spatial expression of the light field near CNT coated microfiber are analyzed by the electromagnetic calculation and mode field analysis experiments. The simulated and experimental results demonstrate that light field distribution along the CNT coated microfiber shows the resonant modes with intensity attenuation locating at ∼0  μm, 1.7 μm, 3.3 μm at the direction of core radius. The investigation about interaction between evanescent wave and CNT films will inspire the future application of CNT films and microfiber based lasers, all-optical switches, wavelength converters, sensors, and other integrated functional photonic devices.