[4] [4] Wolfbeis O S. Fiber-optic chemical sensors and biosensors [J]. Analytical Chemistry, 2004, 7(12): 3269-3284.

[6] [6] Mignani A G, Falciai R, Ciaccheri L. Evanescent wave absorption spectroscopy by means of bi-tapered multimode optical fibers [J]. Applied Spectroscopy, 1998, 52(4): 546-551.

[7] [7] Snyder A W, Love J D. Optical Waveguide Theory [M]. New York: Chapman and Hall, 1983: 120-127, 666-690.

[8] [8] Gupta B D, Singh C D. Fiber-optic evanescent field absorption sensor: a theoretical evaluation [J]. Fiber and Integrated Optics, 1994, 13: 433-443.