Optical zoom method based on super-structured lens using wavelength modulation

An optical zoom and lens technology, applied in the field of optical zoom, can solve problems such as no one mentioned, and achieve the effects of simple device, simple process and low process complexity

Inactive Publication Date: 2018-07-03
NANJING UNIV
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Problems solved by technology

Regarding the chromatic aberration of the metalens, various international research groups are devoted to t

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  • Optical zoom method based on super-structured lens using wavelength modulation
  • Optical zoom method based on super-structured lens using wavelength modulation
  • Optical zoom method based on super-structured lens using wavelength modulation

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, based on the large chromatic aberration metalens, the optical zoom can be realized in the wavelength dimension. figure 1 The picture on the left shows Type 1, that is, the image distance is fixed. When the irradiation wavelength increases, the object distance for clear imaging becomes shorter and the size of the image decreases accordingly. figure 1 The figure on the right shows Type 2, that is, the object distance is fixed, and when the irradiation wavelength increases, the image distance decreases, and the size of the image also decreases.

[0031] figure 2Shown is the comparison of the focusing and imaging of a traditional glass lens simulated by Zemax and a superchromatic lens. (a) The picture shows the focusing effect of a BK7 glass lens with a numerical aperture of 0.23. The blue line represents the wavelength of 400nm, the g...

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Abstract

The invention discloses a method for realizing optical zooming, that is, an optical zoom method based on a super-structured lens using wavelength modulation, based on (1) a light source probe, (2) linear polarizing plates, and (3) quarter wave plates, (4) a super-structured (chromatic aberration) lens; the super-structured (chromatic aberration) lens (4) is placed in the middle of two combinationsof the linear polarizing plates and the quarter wave plates, and a photoreceptor (5) is disposed on the imaging surface for receiving images; and incident light of different wavelengths is used to pass through a super-structured (chromatic aberration) lens for imaging at different image distance positions for zooming. There are two kinds of application scenarios: one is that the image distance isfixed, the illumination wavelength and the object distance are adjusted to obtain the change of the size of the imaging image; the second is that the object distance is fixed, and the illumination wavelength and the image distance are adjusted to obtain the change of the imaging size. The method adopts the design principle of the super-structured surface, the chromatic aberration is controlled bythe phase matching, and the spherical aberration and the coma aberration correction can be performed within a certain imaging interval.

Description

technical field [0001] The invention belongs to the technical field of optical zooming, and relates to a new method based on an ultra-thin bulk large chromatic aberration metalens. In particular, a non-mechanical optical zoom method based on metalens using wavelength modulation. Background technique [0002] Optical zoom is one of the important indicators of digital camera performance. The optical zoom capability is measured by the optical zoom factor, which is the ratio of the maximum focal length at the telephoto end to the minimum focal length at the wide-angle end. Digital cameras change the focal length by changing the relative positions of the lenses in the lens group, thereby changing the viewing angle. Generally, to achieve an optical zoom of more than five times, the volume of the digital camera needs to be relatively increased, leaving more space for the movement of the lens and photoreceptor. At present, the specific methods of realizing optical zoom include ex...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B27/28G02B3/00
CPCG02B27/0075G02B3/00G02B27/0012G02B27/28
Inventor 李涛陈晨王漱明祝世宁
Owner NANJING UNIV
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