Clarity Adaptive Imaging Based On Metasurface Research

As people explore the microscopic world,optical lenses with small focal spots and high resolution are indispensable.By studying the relationship between special materials and electromagnetic waves at the sub-wavelength scale,the super-surface structure breaks through the natural properties of the material itself,and provides infinite possibilities for the design of electromagnetic wave devices.Unlike traditional optical systems,the phase regulation of light waves by metasurfaces does not depend on the phase accumulation on the light propagation path,but the wavefront of electromagnetic waves is controlled by the local phase mutations generated,so the thickness of the metasurface can be much smaller than the incident Light wavelength.Due to the ohmic loss of metals,which limits the efficiency of light wave manipulation,the use of dielectric materials instead of metals to make nano-antennas has become a new approach.The main research contents of this topic are as follows:First,the Ti O2 nanocell structure is used to construct the PB phase supersurface in the visible light band,and the phase regulation mechanism of the supersurface is verified using the FDTD method.On this basis,quantitative deflection and holographic imaging of the optical beam are realized.The super-surface holographic imaging lens stores the phase information of the original picture extracted by the Gerchberg-Saxton(GS)algorithm through the relative phase deflection of the Ti O2 nanocells.When the light irradiates the lens,the original image can be displayed on the display screen on the rear side of the lens.Focusing lenses of different sizes.It shows a good electromagnetic wave convergence effect,and the focusing effect is not affected by the position of the incident electromagnetic wave.Furthermore,this paper proposes an imaging system with adaptive adjustment of the definition based on the super-surface.Unlike conventional camera imaging,which requires a micromotor to adjust the distance between the lens and the CCD,this system replaces the traditional lens with a super-surface lens,and keeps the distance between the lens and the imaging screen unchanged.In order to achieve clear imaging,the system uses the edge detection algorithm based on the Sobel operator to detect the number of edge images and edge pixels,thereby judging the image sharpness,and then dynamically adjusting and changing the phase distribution of the supersurface lens according to the imaging sharpness.focal length.In this paper,a hyper lens and adaptive imaging system with a demonstration effect are designed in detail,and the process of sharpness adaptive imaging is completely simulated.The simulation results verify that the system can achieve sharpness adaptive imaging,that is,the imaging is from unclear to clear.Although it is technically impossible to realize real-time reconstruction of the super-surface in the optical frequency band,the research on this subject provides a new method for adaptive clear imaging in the future,and may have potential application value in optical cameras and microscope imaging.