Design And Charactering Of Quasi-Phase Photon Sieve

Photon sieve is a novel diffractive optical element in recent ten years. It consists of a great number of pinholes distributed over transparent band of the Fresnel zones plate. The diffraction light of each pinhole has the same phase in the corresponding position, improving the focusing characteristics greatly. It also can suppress the side-lode effect and improve the resolution, so the quality of the optical imaging is improved greatly. Photon sieve has lots of advantages such as small size, light weight, wide spectral range, flexible design, high resolution, make array easily. Spectral range covers the spectral region that traditional optical device is difficult to achieve (including visible light, extreme ultraviolet, soft X-rays). The dissertation presented a futher study about quasi-phase photon sieve. The contents and the innovation can be generalized as:1. We analyze the imaging theory of photon sieve and deduce the formula. The expression of optical field distribution in the focal plane is deduced, which provided an evidence for the design and the optimization of the photon sieve. We also get the position distribution of pinholes and the relationship between aperture size and amplitude of the diffraction field.2. According to the simulation of photon sieve, the schematic picture and the intensity pictures in the focal plane and in the direction of optical axis are given out. The results show that photon sieve has excellent focusing characteristics.3. The position distribution of photon sieve is optimized by window function. We choose the most suitable window function by comparing the different optimized effect and get the best d/w ratio by changing the aperture size of pinholes.4. The dispersion characteristics of photon sieve is analyzed. When increasing or decreasing the wavelength, the light energy is reduced sharply. Because of the wavelength selectivity, photon sieve will not be affected by chromatic aberration. The influences of some errors on focusing properties are discussed.5. The processing method of photon sieve is introduced briefly. The imaging experiments are carried out, including the test of focusing characteristics, the test of imaging characteristics, the testing for resolution of the board, the test of spectral transmittance. The final results are consistent with theory results.