Metalens array device

A lens array and device technology, applied in the field of nano optics, can solve the problems of inability to obtain additional information, large space optical path, single function, etc., and achieve the effect of reducing the space volume of the system

Pending Publication Date: 2021-11-19
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current research on polarization detection and imaging, the metasurface is used as a separate component, which still requires a large spatial optical path, and does not reflect the characteristics of ultra-thin
In addition, the current polarization detection imaging has a single function and cannot obtain additional information

Method used

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Examples

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Effect test

example 1

[0044] Example 1 Hardman sensor

[0045] For the polarization detection function, that is to obtain the light intensities of the four polarization components mentioned above, at this time Figure 4 The size of b in is close to f, because the polarization detection is to obtain the four parameters of the polarization stokes, and the expression of the parameters is:

[0046]

[0047] The expression for obtaining light intensity information is:

[0048]

[0049]

[0050]

[0051]

[0052] Among them, I is the light intensity, δ is the phase difference between the two orthogonal directions of light, the polarization state can be calculated by simple linear transformation, and the distribution of several common polarized light can be obtained according to the distribution of the focal spot of the lens out, such as Figure 5 shown. This is because the four focal points of the metalens are sensitive to four kinds of polarized light respectively. From left to right a...

example 2

[0053] Example 2 Polarized Light Field Camera

[0054] Figure 4 The focal length f in is close to the distance between the two, and the specific distance depends on the designed image size. The size of the image depends on the object distance a and the image distance b, and the imaging formula is:

[0055]

[0056] Among them, a is the distance from a certain image surface of the main lens to the lens array. Different a represents different depths, and the final image sizes are also different. Therefore, by selecting sub-image blocks of different sizes on the CMOS photosensitive chip, you can Select the imaging of objects at different depths. In order to obtain light field information and non-overlap between sub-images, it is also necessary to ensure that the image is reduced by more than two times, that is, a is greater than twice b. For the common Kepler and Galileo imaging modes, the relationship between f and b can be obtained ,

[0057] f / 2

[005...

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Abstract

The invention discloses a metalens array device, which is characterized in that a circuit board of a CMOS image processor, a photosensitive element, OCA (Optical Clear Adhesive), a metasurface, indium tin oxide and a silicon oxide transparent substrate are connected in sequence, the connection mode depends on the adhesive force between molecules, no connection structure exists except the OCA 3, and the metasurface is a dielectric nano-structure array. According to the metalens array device, full-Stokes polarization detection can be realized, and the metalens can simultaneously obtain four kinds of polarization intensities, so that the metalens can be used as a Harman sensor; four-focus lenses are arrayed, such that different polarized light field imaging can be carried out, and the advantage of multiple functions is embodied; and the imaging distance of the lens made of the metasurface is designed to be the sum of the thickness of the glue and the distance between a CMOS packaging layer and a photosensitive chip, the metasurface can be directly integrated on the CMOS photosensitive chip, the CMOS can directly extract light intensity information, the system space size is greatly reduced, and the ultra-compact feature is displayed.

Description

technical field [0001] The invention relates to a meta-lens array device, which belongs to the field of nano optics. Background technique [0002] The traditional polarization imaging system is separated from the light field imaging system, and its optical system is often very complex. The high processing precision makes processing difficult, and the bulky volume makes it difficult to integrate the device. With the development of smart devices, all kinds of devices in the optical system are developing in the direction of miniaturization, integration, multi-function and high performance. In recent years, a metasurface composed of subwavelength-sized and spaced structures arranged in a two-dimensional plane has been proposed to regulate electromagnetic wave parameters. By rationally designing the shape, size, position and direction of the structure, the metasurface The phase, amplitude, polarization, and frequency of light can be adjusted arbitrarily, coupled with the ultra-t...

Claims

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Application Information

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IPC IPC(8): G02B27/28G02B3/00G02B27/00G02B1/00H04N5/374
CPCG02B27/28G02B3/0006G02B1/002G02B27/0012H04N25/76
Inventor 段辉高王旭东胡跃强张建李苓
Owner HUNAN UNIV
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