Light Information Processing Based On The Nano-array Structures Abstract

In1960, the successful operation of the world’s first ruby laser had ushered a revolution inoptical field. Especially for the new booming era of optical information processing technologywhich is based on the Fourier analysis method. At the same time, the rapid development of avariety of nanofabrication technologies have contributed to fabricate the various of nanostructures,and the microscopic properties of the nano-structures and their new features in the optical fieldhave urged the nanotechnology become an inevitable choice for solving the problem ofminiaturization of the optical system. Using nano-array structures for optical informationprocessing has developed a new direction of the nano-information optics. Furthermore, applyingthese structures in the image processing and lensless image reconstruction has importantsignificance for the theoretical and practical application. This paper has studied the noniterativeimage reconstruction method based on the subtraction of diffraction-intensity pattern.The main chapters of this paper are as follows: in the first chapter, the background and thesignificance of our study were described. The second chapter describes the basic theory of opticalinformation processing. A composite film preparation method and a direct-writing device which isbased on the low-power laser were described in Chapter III. furthermore, a microarray chip hascarved on the film surface by using this device. Chapter IV has analyzed the fractal characteristicsof the far-field diffraction intensity distribution of the nano-Thue-morse chip. Firstly, the far-fielddiffraction patterns of the Thue-morse chips were obtained by a numerical simulation method.Secondly, two Thue-morse chips have prepared by the electron beam etching technology and theirfar-field diffraction patterns were also obtained by experiment. Thirdly, comparing the simulatedresults with the experiment results has proved that the numerical simulation method is feasible andthe far-field diffraction of the Thue-morse chips has rotational symmetry and self-similarity. Thenon-iterative image reconstruction method based on the diffraction intensity subtraction wasdiscussed in Chapter V. The wavefront from the object can be extracted directly by the subtractionof three diffraction intensity patterns of an object and two masks which are assembled separatelyby two kinds of hexagonal array mask and the object. In addition, the problem of how the noiseaffected the quality of the reconstructed image and how to suppress it is also discussed by thenumerical simulation method.