Digital holographic imaging system based on composite zone plate

Abstract

The invention relates to a digital holographic imaging system based on a composite zone plate, which is composed of a composite zone plate and an image detector, the composite zone plate is formed by combining a phase zone plate and an amplitude zone plate, and the phase zone plate and the amplitude zone plate are manufactured on the same substrate. After incident light waves pass through the composite wave zone plate, only + / -1-level diffracted light is generated, a detected sample is arranged behind a + 1-level focus, when converged spherical waves pass through the focus and illuminate the detected sample, the spherical waves are scattered to form object light waves carrying information of the detected sample, the object light waves interfere with-1-level divergent spherical waves which are not scattered in an overlapping area, and the detected sample is detected. Therefore, a digital holographic imaging system with the + 1 level as an illumination light source and the-1 level as a reference light source is established, and the phase contrast hologram is utilized to reversely reconstruct object light wavefront information. By combining diffraction light wave modulation, a micromachining optical technology and a digital holographic imaging system, an included angle between an object light wave and a reference wave can be increased, the capability of capturing high-frequency band information of the object light wave is further improved, and the device has relatively high environment adaptability and a relatively high measurement dynamic range; and a new way is provided for online detection of micro-nano elements and microscopy of biological characteristics of living bodies.

Description

technical field [0001] The invention belongs to the field of optical information technology, and relates to a digital holographic imaging system based on a composite zone plate. Background technique [0002] With the development of computational imaging technology, the lensless on-chip microscopic imaging technology does not have an imaging lens to focus, and the observed sample is directly attached to the photosensitive surface of the imaging device to record the image, and combined with the corresponding image restoration algorithm to realize the reflection of the clear object image. The evolution and reconstruction can not only reduce the complexity of optical hardware, but also can use new theory and numerical algorithm for digital compensation. [0003] A series of new microscopic imaging methods have emerged: digital holographic microscopy, light intensity transfer equation quantitative phase microscopy, (spatial) stack imaging, Fourier stack microscopic imaging, compu...

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Problems solved by technology

[0004] The newly proposed pinhole-based holography, in addition to the advantages of the above-mentioned lens-free imaging technology, has a wider range of wavelength adaptation, but the factors that affect its imaging performance are more prominent, including the size of the pinhole structure and the uncertainty of the circle. As well as zero-order image and twin image, although the two influencing factors can be eliminated by certain methods, it will make the microscope more complicated, reduce its own real-time advantages, and limit its promotion and application

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