Studies On The Coupling Performance Of GRIN Polymer Micro-Sphere

Polymer gradient refrective index (GRIN) micro-sphere-lens are a new-type optical element of very simple geometrical shape, whose optical function is mainly achieved by the inhomogeneous reflective index distribution of the medium. It has such advantages — simple geometric shape, small volume, short optical path, lightness in weight, easiness in producing by wholesale, etc. It has great potentialities in such fields as micro-optics, integrated optics and optics communication.Firstly, based on the basic theory of GRIN optics the optical effects of the spherical symmetry GRIN micro-sphere lens were analyzed systematically. Then two suitable monomers were selected to fabricate GRIN micro-sphere lens by suspension-diffusion-copolymerization method. Finally, the refractive index distribution curve and other optic parameters of the micro-lens were measured.On the base of that ,we make comprehensive theoretical analysis to coupling performance between GRIN sphere micro-lens of different parameters and symmetrical micro sphere. We find that GRIN sphere micro-lens is superior to the latter in coupling performance .Main contents as followed:Chapter 1. Simply introduce the background knowledge of gradient index optics, micro-optics and polymer gradient index material. Besides, elaborate the contents and significance of the research.Chapter 2. Expatiate on the basic theory of the GRIN micro-sphere-lens, especially on the classical model—MAXWELL fisheye lens, which demonstrates their excellent optical properties.Chapter 3. Elaborate the theoretics of making polymer GRIN micro-lens by means of suspension-diffusion-copolymerization and the measurement of the common optics parameter of the medium lens, such as light passing index, no-sphericity and so on, then analyze those results and make advises on how toimprove.Chapter 4. According to the theoretical model of light transmission in the GRIN medium, theoretically demonstrate the feasibility of the coupling efficiency via the theoretical computation of the coupling efficiency of the MAXWELL fisheye lens and the micro-sphere lens we made.Chapter 5. We make therical analysis to Maxwell fisheye micro-sphere lens of reverse gradient on the basis of basic theory that ray transmits in spherical symmetry GRIN mediator, we get the focal distance formula of reverse Maxwell fisheye micro-sphere lens and bring its coupling efficiency into therical analysis.Chapter 6. Sum up the achievements we made.The advantages and disadvantages of the application of GRIN polymer micro-sphere on retro-reflection were analyzed and we have some aspects to be approved in the future.