Using Tapered Optical Fibers and Optical Waveguides Made by UV Lithography to Attract and Transport

• Main Authors: Hong-Yu Wu, 吳泓諭
• Other Authors: Fang-Wen Sheu
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/6gdkmn

碩士 === 國立嘉義大學 === 光電暨固態電子研究所 === 97 === In this study, we use a fiber puller to transform a telecom single-mode optical fiber into a symmetric and unbroken tapered optical fiber. Then we put it into a dilute solution of polystyrene microparticles. A 980 nm diode laser is coupled into the tapered optical fiber through a 20X microscope objective lens. Then we use a CCD camera and an objective lens to observe the microparticles from the fiber top. We have observed that, due to the evanescent wave, the microparticles will be attracted onto the surface of the tapered fiber and roll in the direction of light propagation when the microparticles flow near the region of the tapered fiber. In addition, we use the UV lithography technology to make a strip optical waveguide by etching the SU-8 photoresistor coated on a glass plate. Then we perform the same experiment on the microparticle manipulation. Compared with the traditional optical tweezer, the technique of using the evanescent wave out of the optical waveguide to attract and transport the microparticles has more controllable range and more variety in manipulation. Moreover, we use a software to simulate the various situations in different sections of the tapered fiber and different heights of the SU-8 waveguide, respectively. We simulate the optical influence on the microparticles when the laser light is launched into the waveguide, and make a comparison with the results of the experiment.