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A tomography method based on aspheric metalens

A tomography and spherical aberration technology, applied in the field of tomography, can solve problems such as unsolved spherical aberration, and achieve the effects of simple design, simple device and low process complexity

Active Publication Date: 2021-04-27
NANJING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Regarding the chromatic aberration of the metalens, various international research groups are devoted to the research of achromatic aberration, but there is little mention of how to effectively use the chromatic aberration
And the problem of spherical aberration in the microscopic imaging process of the metalens has not been solved before here

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  • A tomography method based on aspheric metalens
  • A tomography method based on aspheric metalens
  • A tomography method based on aspheric metalens

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the following examples, but should include the entire content of the claims.

[0048] figure 1Shown is an example of the chromatic aberration performance of an ordinary glass lens (BK7) and a metalens (based on the geometric phase principle) with the same numerical aperture (NA=0.2175). (a) The picture shows the BK7 glass lens, and (b) the picture shows the metalens. Both of them are designed with a focal length of 0.108mm when the wavelength is 532nm. The scale bar in the picture is 10um. According to the results of ray tracing, in the visible light range of 400nm-760nm, the focal length change of the metalens is 17 times that of the glass lens, that is, the dispersion effect of the metalens is more than an order of magnitude that of ordinary glass.

[0049] According to the...

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Abstract

The invention discloses a tomographic imaging method based on an aplanatic metalens, that is, a tomographic imaging technology based on an aplanatic metalens using wavelength encoding, based on (1) a light source probe, (2) an aplanatic super (3) linear polarizer and (4) quarter-wave plate can be inserted into the imaging system as an auxiliary optical element to directly improve the signal-to-noise ratio, and a photoreceptor (5) is provided on the imaging surface for Accept the image; through relatively continuous irradiation of different wavelengths, obtain the image plane information encoded by the wavelength, and then process the corresponding algorithm to obtain the tomographic image information of the object. The invention adopts the design principle of the metasurface, and utilizes the phase to realize the adjustment and control of the chromatic aberration and the correction of the spherical aberration.

Description

technical field [0001] The invention belongs to the technical field of tomography, and relates to a new method of a large chromatic aberration metalens based on ultra-thin volume aplanatic aberration. Background technique [0002] Tomography plays an indispensable role in biomedical research. Tomography is a technical means to obtain the tomographic information of organisms and observe their internal three-dimensional structures. The current mainstream tomographic imaging techniques include X-ray computed tomography, nuclear magnetic resonance imaging, ultrasonic tomography, optical projection tomography, laser scanning confocal microscopy, optical coherence tomography, and single photon emission tomography. and positron emission tomography. [0003] Among them, compared with other types of tomography, optical tomography has the advantages of less interference to tissues, high resolution level, and real-time imaging in vitro or in vivo. Optical projection tomography is ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B3/00G01N21/17G01N21/01
Inventor 李涛陈晨祝世宁
Owner NANJING UNIV
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