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Preparation Of One Dimensional Microstructure Waveguides And Their Optical Properties

Posted on:2016-06-08Degree:DoctorType:Dissertation
Country:ChinaCandidate:H Y LiFull Text:PDF
GTID:1108330503469604Subject:Chemical Engineering and Technology
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Micro and nano wave-guide based on the small size effect bring a unique concern with optical properties as the basic unit of opt-electronic devices. There are some issues to be resolved in some basic researches. In order to achieve functional diversity of micro and nano wave-guides, this paper carried one-dimensional micro and nano wave-guide and the micro-optics built research. Preparation of laser dye modified polymer micro-wave-guide, and self-coupled micro-cavity, the mode selection mechanism preliminary exploration. Studied the optical properties of the micro-system composed of micro-hollow cylindrical tube with fluorescence micro-spheres. Studied the kinetic effects of pulses laser generated in the silicon micro-wave-guide as a guiding light media.The laser dye R6 G doped polymer PMMA micro-wave-guide prepared by direct stretching, wave-guide has uniform diameter, and the smooth surface is less than 1nm. Emission intensity of micro-wave-guide has increased with R6 G doping concentration increases.When the doping concentration reaches 8 wt %, the luminous intensity arrive saturation. By micro-manipulation of the micro-wave-guide, three SCRs resonance micro-cavity was formed, optically pumped the three SCRs micro-cavity generated single-mode laser. We compared to the quality factor, laser threshold, and other parameters of three SCRs micro-cavity, the higher of the coupling efficiency the higher of the Q, and the lower of the laser threshold. Linear wave-guide loss constant α = 302cm-1, this value is approximately slightly 1/2 of the curved wave-guide(α = 605 cm-1), the main reasons of the loss are the self-absorption of the material itself and the dispersion of the bending loss. Resonant wave can be amplified in the gain and SCRs cavity while resonant wavelength of light meeting the natural resonant wavelength of two inherent closed ring resonators which were right and left sides from the coupling micro-cavity, resulting in single-mode laser. SCRs micro-cavity having a high capability of mode selection. Meanwhile FDTD simulation of several micro-cavity were made, most of the field energy is restricted to micro-wave-guide inside, no serious leaks scattering phenomenon. Light mode guide direction in FDTD simulation propagated along the section of micro wave-guide indicated micro-cavities have higher coupling efficiency.The hollow micro-tubules prepared by direct tensile, the micro-tubule inner diameter is about 6.2μm, wall thickness is about 900 nm, and Rh B dye laser doped polystyrene micro-spheres prepared by dispersion polymerization. Using micro manipulation, the micro-spheres were placed inside the hollow micro-tubule. By optical pumping, WGMs mode light was observed in micro-spheres-micro-tubule system. Under the same conditions of the doping concentration of Rh B, the micro-spheres with a larger volume have higher spectral intensity. With the reduced of system size, WGMs resonance phenomenon is more obviously. In addition, as the excitation light plane sectional moved along the center of the micro-sphere upward, the light emission intensity increases. The light emission intensity sharply reduce when the excitation light plane reached the edge of micro-tubule.Experimental observation of micro-tubule system in the WGMs mode splitting, mode split value is Δλ = 0.8nm. Because of the strong coupling effects between the two micro-spheres, 30% reduction of the Q value of double ball compared to a single. By changing the power of the excitation light can be different WGMs emission intensity; the photon can not be restricted in micro-sphere surface by completely reflection due to strong coupling between two equal size micro-spheres, so the two ball micro-tubule system loss rate is higher than the single ball.Silicon micro wave-guide prepared by direct flame heating tensile, glass micro-sphere and silicon micro-wave-guide arrangement by micro manipulation under the microscope. When import pulsed laser, outgoing pulse from the tip of wave-guide propulsion micro-sphere movement was observed under the microscope. The tip diameter of wave-guide is 2.6μm, a single pulse of light emitted, the glass micro-sphere having a diameter of 46μm which was moved in the forward 298μm in 7/1000 s. Depending on the heating temperature and the stretching rate, the preparation of micro wave-guide diameter range from 1.9μm to 125μm. A diameter of 1.9μm of the fiber tip outgoing light had the highest power density. Under the the same conditions of the diameter of fiber tip, with increasing pulse energy of the emitted light, motion of micro-sphere movement distance and speed increases. The position of fiber tip deviated from the micro-sphere center, the micro-sphere by force in both directions X and Y, the micro-sphere in upward movement angle is 43° and distance S is 587μm; After the experiment the tip of the fiber is smooth, end exit 532 nm spot uniformity description experiment did not produce heat damage.
Keywords/Search Tags:waveguide preparation, one-dimensional micro structure optical waveguide, micro and nano laser, coupled resonator, photon dynamics effect
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