Research On Photon Sieve Imaging Syste With Large Field Of View And Wide Waveband

The structure of the photon sieve is evolved from the Fresnel zone structure,and the light-transmitting holes are used to replace the transmissive ring in the Fresnel zone.Photonic sieves have a high optical image quality.At the same time,photonic sieve compared to the traditional optical lens,the photonic screen on the face of the low er precision requirements,which greatly saves manufacturing costs.However,the photonic sieve has a strong dispersion effect,although the design wavelength can achieve good image quality,but the other wavelengths of light can not be in the same focal p lane convergence imaging point,the color is very large,resulting in photoresist primary mirror imaging system The working band is very narrow In this paper,the imaging characteristics of photonic sieve are studied and analyzed,and the imaging system based on photon sieve is designed.The aim is to improve the effective working band and field of view of photonic sieve imaging.Firstly,a mathematic model is established for the imaging process of photonic sieve.Based on the scalar diffraction theory,the mathematical formula of photon sieve imaging is deduced by using the related mathematical knowledge and mathematical approximation,and furthermore,in the case of parallel light incidence(ideal)Imaging formula.At the same time,using the knowledge of radiology,the parameters of the photomask main mirror designed in this paper are deduced and deduced,and the design and simulation are carried out by using Matlab software.Moreover,the preparation of the photonic screen imaging characteristics of the s tudy.It is found that photonic sieves have good imaging performance for single wavelengths and have high light concentration.Photon sieve imaging on the high order of the diffraction order has a significant inhibitory effect,most of the light concentrat ed in the first level.Photonic sieve for multi-wavelength imaging,with a serious dispersion effect,the color is very large.Secondly,in order to correct the chromatic aberration of photonic sieve imaging,the effective band of photon sieve imaging is expanded.Based on the scheme proposed by the American Air Force Academy to correct the chromatic aberration of photonic sieve,this paper proposes a solution of Schupmann achromatic system,and deduces the mathematical formula of Schupmann achromatic system.At the same time,the structure of achromatic system optical path is determined.And discuss some of the details and problems of designing a secondary corrector in the achromatic optical path.The simulation results of the secondary corrector in the op tical path are analyzed by Matlab,and the parameters of the second-stage corrector are given.Later,in the Zemax software,the initial shape of the photon sieve imaging was designed with the plane instead of the lens shape,and a simple reference was m ade for the subsequent design.Finally,the Zemax software is used to simulate the actual system.Since the Zemax software does not have a photon sieve model,the photon sieve must be designed in advance in the Matlab software,and then photon sieves can be introduced into the Zemax software through a series of steps.At the same time,the use of optical design of the relevant knowledge,select the appropriate type of glass,design achromatic optical path,and finally photon sieve primary mirror and achromatic optical path together to optimize,and finally complete the design.