CN114839771B - Micro large-view-field local amplifying optical system based on metasurface - Google Patents
Micro large-view-field local amplifying optical system based on metasurface Download PDFInfo
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- 230000003321 amplification Effects 0.000 claims abstract description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 24
- 230000000694 effects Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000005357 flat glass Substances 0.000 claims description 2
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The invention discloses a micro large-view-field local amplifying optical system based on a metasurface, and belongs to the technical field of micro optical imaging. The invention comprises a miniature large-view-field front objective optical system, a miniature partial amplifying optical system based on a metasurface optical element, a miniature relay imaging optical system and a photoelectric detector. The incident light is converged on a micro local amplifying optical system based on a metasurface optical element through a micro large-view-field front objective optical system, and the light respectively and simultaneously generates two images with different amplification factors through a metasurface local amplifying area and a non-amplifying area, namely, an image which is amplified through modulation and an image which is outside an unmodulated target area are obtained, and the two images with different amplification factors are focused on a photoelectric detector through a micro relay imaging optical system, so that the imaging with different amplification factors is carried out on the target within a large view field range. The invention has the advantages of good imaging effect, miniaturization and integrated imaging.
Description
Technical Field
The invention belongs to the technical field of micro optical imaging, relates to an optical system for realizing local amplification of a micro large view field, and particularly relates to an optical system for realizing local amplification through a metasurface.
Background
The conventional video monitoring imaging optical system at present has the problem that large-view-field, high-resolution imaging and equipment miniaturization cannot be realized at the same time. In recent years, optical metasurfaces have overcome some of the limitations faced by conventional optical elements. The optical metasurface can independently control the properties of phase, amplitude and the like in a sub-wavelength scale and a compact form, thereby realizing the function of adjusting the optical power. The invention provides a miniature large-view-field local amplifying optical system based on a metasurface, which changes the transmission phase of light passing through the metasurface by changing the geometric dimension and the spatial distribution of the metasurface structure, and realizes the function of adjusting the focal power, thereby realizing imaging with different amplification factors in one optical system. Compared with the traditional large-view-field optical system, the miniature large-view-field local amplification optical system has great promotion in key technology, so that the whole large-view-field local amplification optical system can realize local amplification of different areas and miniaturization of whole equipment while ensuring imaging within a large view field range, and is beneficial to integrating the system in electronic equipment under a hidden environment. In the field of optical imaging, patent application number CN107632392a discloses a dynamic locally-amplified high-resolution imaging system, which adopts a transmissive liquid crystal spatial light modulator to realize locally-amplified high-resolution imaging inside a large-field optical system. The system solves the contradiction between large field of view and high resolution imaging of the existing optical system, but the system is limited by the size of the traditional optical element and cannot be miniaturized.
Disclosure of Invention
The invention mainly aims to provide a miniature large-view-field local amplifying optical system based on a metasurface, which can image targets in a large-view-field range at different magnifications under miniature equipment and can be used for accurately identifying a miniature monitoring imaging system and the targets. The invention has the advantages of good imaging effect, miniaturization and integrated imaging.
The object of the invention can be achieved by the following technical scheme.
The invention discloses a micro large-view-field local amplifying optical system based on a metasurface, which comprises a micro large-view-field front objective optical system, a micro local amplifying optical system based on a metasurface optical element, a micro relay imaging optical system and a photoelectric detector. The incident light is converged on a micro local amplifying optical system based on a metasurface optical element through a micro large-view-field front objective optical system, and the light respectively and simultaneously generates two images with different amplification factors through a metasurface local amplifying area and a non-amplifying area, namely, an image which is amplified through modulation and an image which is outside an unmodulated target area are obtained, and the two images with different amplification factors are focused on a photoelectric detector through a micro relay imaging optical system, so that the imaging with different amplification factors is carried out on the target within a large view field range.
Further, by changing the geometry, height, duty ratio and rotation angle of the nano-pillars of the metasurface, the function of changing the focal power of the metasurface-based optical element is realized, and the light beam phase of the emergent metasurface-based optical element is randomly modulated, so that the functions of changing the focal power and changing the magnification are achieved.
Further, the miniature large-view-field front objective optical system converges light rays of different view fields to a miniature partial amplifying optical system based on the metasurface optical element, and collects light rays within a large view field range.
Further, the micro-partial-magnification optical system based on the metasurface optical element is a combined micro-optical element.
Further, the local amplifying region of the micro local amplifying optical system based on the metasurface optical element is the optical element based on the metasurface, the non-local amplifying region is the traditional optical flat glass, the amplifying magnification is not changed, and only the transmission of light is realized.
Further, the micro relay imaging optical system images two different magnifications according to optical proportion, and imaging effect is improved.
Further, the photodetector images with different magnifications through the micro relay imaging optical system.
The invention discloses a working method of a miniature large-view-field local amplifying optical system based on a metasurface, which comprises the following steps:
the light rays with large fields of view are focused and imaged on a primary image surface through the miniature large-field front objective optical system, the light rays with various fields of view are respectively imaged on different positions on the primary image surface, wherein the light rays with different fields of view pass through the miniature local amplifying optical system based on the metasurface optical element, the light rays with various fields of view have relative independence in front of the primary image surface, and the miniature local amplifying optical system based on the metasurface optical element is placed in front of the primary image surface to carry out phase modulation on different local target light rays.
The micro local amplification optical system based on the metasurface optical element is required to calculate the phase distribution of emergent light beams after passing through the optical elements with equivalent different magnifications, and according to the calculated phase distribution function, the phase modulation of the emergent light beams passing through the metasurface local amplification area is realized by changing the radius r, the height h and the single unit period p of the metasurface single unit, so that the modulation of different focal powers of the emergent light beams of the field of view in the area by the micro local amplification optical system based on the metasurface optical element is realized, and the imaging with the magnification changed is realized; the area not containing the metasurface optical element does not modulate the outgoing beam phase, thereby realizing imaging without changing the magnification.
The miniature relay imaging optical system is used for carrying out secondary imaging on primary intermediate images with different magnifications obtained by the miniature large-view-field front objective optical system and the miniature partial amplification optical system based on the metasurface optical element; the photoelectric detector is used for receiving the secondary image obtained by the micro relay imaging optical system.
The beneficial effects are that:
1. the invention discloses a miniature large-view-field local amplifying optical system based on a metasurface, incident light is converged on the miniature local amplifying optical system based on a metasurface optical element through a miniature large-view-field front objective optical system, and the light respectively passes through a metasurface local amplifying area and a non-amplifying area to generate images with two different amplifying magnifications, wherein the two areas can modulate different converging light beams in the view field range of the miniature large-view-field front objective imaging optical system, so that optical imaging with different amplifying magnifications in the large view field range is realized.
2. The invention discloses a micro large-view-field local amplifying optical system based on a metasurface, which realizes the function of changing the focal power of an optical element based on the metasurface by changing the geometric dimension, the height, the duty ratio and the rotation angle of a nano column of the metasurface, and randomly modulates the phase of a light beam emitted from the optical element based on the metasurface, thereby achieving the functions of changing the focal power and the amplifying power.
3. The miniature large-view-field local amplification optical system based on the metasurface can realize miniaturization and integrated imaging of different magnifications of objects in a large-view-field range, and can be applied to the field of integrated optoelectronic devices and novel photoelectric detection equipment.
Drawings
Fig. 1 is a schematic diagram of a micro-scale partial magnification optical system based on a metasurface optical element in accordance with the present disclosure.
Fig. 2 is a schematic diagram of micro-scale partial magnification optical system elements based on metasurface optical elements.
FIG. 3 is a three-dimensional schematic of a single nanopillar of a metasurface.
Wherein: 10-micro large-field front objective optical system, 20-micro partial amplifying optical system based on metasurface optical element, 30-micro relay imaging optical system and 40-photoelectric detector.
Detailed Description
For a better description of the objects and advantages of the present invention, the following description will be given with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1, the micro large-field local magnification optical system based on the metasurface disclosed in this embodiment includes a micro large-field front objective optical system 10, a micro local magnification optical system 20 based on the metasurface optical element, a micro relay imaging optical system 30, and a photodetector 40, different field incident light passes through the micro large-field front objective optical system 10, images on the primary image plane of the micro large-field local magnification optical system based on the metasurface, the micro local magnification optical system 20 based on the metasurface optical element modulates light in different field ranges on the primary image plane, two kinds of images with different magnification are generated, and the images with different magnification are focused on the photodetector 40 after passing through the micro relay imaging optical system 30.
A miniature large field-of-view front objective optical system 10 for converging incident light rays to a miniature partial magnification optical system 20 based on metasurface optics.
The micro-local amplifying optical system 20 based on the metasurface optical element is shown in fig. 2, and is used for modulating light rays in different areas within different view fields with different magnification, wherein the function of changing the focal power of the optical system is realized by changing the rotation angle of a single nano-pillar of the metasurface and modulating the phase of the incident light ray based on the metasurface optical element area by geometric size, and the phase distribution of the light rays with the magnification is generated; the region not containing the metasurface optical element only plays a role in transmitting incident light, and does not play a role in magnification.
The micro-local amplifying optical system 20 based on the metasurface optical element is shown in fig. 3, and phase distribution of the emergent light beam after passing through the optical element with equivalent different magnifications is calculated first, and according to the calculated phase distribution function, phase modulation of the emergent light beam passing through the metasurface area is realized by changing radius r, height h and single unit period p of the metasurface single unit, so that modulation of different focal powers of the emergent light beam with different fields of view by the micro-local amplifying optical system 20 based on the metasurface optical element is realized.
The micro relay imaging optical system 30 is used for performing secondary imaging on primary intermediate images with different magnifications obtained by the micro large-field front objective optical system 10 and the micro partial amplification optical system 20 based on the metasurface optical element; the photodetector 40 is configured to receive the secondary image obtained by the micro relay imaging optical system 30.
The light rays with large fields of view are focused and imaged on a primary image surface through the miniature large-field front objective optical system 10, the light rays with various fields of view are respectively imaged on different positions on the primary image surface, wherein the light rays with different fields of view pass through the miniature local amplifying optical system 20 based on the metasurface optical element, the light rays with various fields of view have relative independence in front of the primary image surface, and the phase modulation is carried out on different local target light rays in front of the primary image surface through the miniature local amplifying optical system 20 based on the metasurface optical element; the converging light beam obtained by the micro large-field front objective optical system 10 passes through the micro partial amplifying optical system 20 based on the metasurface optical element, wherein the phase modulation of the emergent light beam passing through the metasurface area is realized by changing the geometric dimension of the nano-pillar in the metasurface area, and the amplified imaging of the emergent light beam passing through the metasurface area is realized; the emergent light beams of other fields passing through the non-metasurface area are not subjected to optical modulation, and the imaging light beams with two magnifications are obtained on the image surface of the miniature large-field front objective optical system 10; and then imaged on the photodetector 40 via the micro relay imaging optical system 30.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. The utility model provides a miniature large visual field local amplification optical system based on metasurface which characterized in that: the system comprises a miniature large-field front objective optical system (10), a miniature partial amplification optical system (20) based on a metasurface optical element, a miniature relay imaging optical system (30) and a photoelectric detector (40); incident light is converged on a micro local amplifying optical system (20) based on a metasurface optical element through a micro large-view-field front objective optical system (10), and two images with different amplification factors are generated through a metasurface local amplifying area and a non-amplifying area respectively, so that a modulated amplified image and an image outside an unmodulated target area are obtained, and the two images with different amplification factors are focused on a photoelectric detector (40) through a micro relay imaging optical system (30) to realize different amplification factor imaging of a target in a large view field range;
the function of changing the focal power of the optical element based on the metasurface is realized by changing the geometric dimension, the height, the duty ratio and the rotation angle of the nano column of the metasurface, and the light beam phase of the emergent optical element based on the metasurface is modulated, so that the functions of changing the focal power and the magnification are realized;
the micro local amplifying optical system (20) based on the metasurface optical element has a local amplifying region based on the metasurface optical element, and a non-local amplifying region is a traditional optical flat glass, so that the amplification ratio is not changed, and only the transmission of light is realized.
2. The metasurface-based micro large field of view partial magnification optical system of claim 1, wherein: the miniature large-view-field front objective optical system (10) converges light rays of different view fields to a miniature partial amplifying optical system (20) based on a metasurface optical element, and collects light rays within a large view field range.
3. The metasurface-based micro large field of view partial magnification optical system of claim 1, wherein: the miniature partial magnification optical system (20) based on the metasurface optical element is a combined miniature optical element.
4. The metasurface-based micro large field of view partial magnification optical system of claim 1, wherein: the micro relay imaging optical system (30) images two different magnifications according to optical proportion, and improves imaging effect.
5. The metasurface-based micro large field of view partial magnification optical system of claim 1, wherein: the photodetector (40) images through the micro relay imaging optical system (30) to form images with different magnification.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107632392A (en) * | 2017-08-22 | 2018-01-26 | 北京理工大学 | Dynamic local amplifies high-resolution imaging system |
| CN114047626A (en) * | 2021-10-22 | 2022-02-15 | 北京理工大学 | Double-channel local high-resolution optical system based on DMD |
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| US9482796B2 (en) * | 2014-02-04 | 2016-11-01 | California Institute Of Technology | Controllable planar optical focusing system |
| US10591643B2 (en) * | 2015-11-20 | 2020-03-17 | The Board Of Trustees Of The Leland Stanford Junior University | Light-field imaging using a gradient metasurface optical element |
| WO2017117751A1 (en) * | 2016-01-06 | 2017-07-13 | 苏州大学 | Real-time variable-parameter micro-nano optical field modulation system and interference photoetching system |
| CN107229126A (en) * | 2017-07-18 | 2017-10-03 | 苏州大学 | A kind of micro-nano light field builds modulating system and method in real time |
| WO2019148200A1 (en) * | 2018-01-29 | 2019-08-01 | University Of Washington | Metasurfaces and systems for full-color imaging and methods of imaging |
| CN110045510B (en) * | 2018-09-28 | 2020-09-01 | 北京理工大学 | Biconcave three-dimensional imaging system |
| TWI728605B (en) * | 2018-12-20 | 2021-05-21 | 中央研究院 | Metalens for light field imaging |
| CN114296155B (en) * | 2021-12-02 | 2023-02-07 | 华中科技大学 | Wide-spectrum optical zoom system based on double-layer medium super-surface |
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| CN107632392A (en) * | 2017-08-22 | 2018-01-26 | 北京理工大学 | Dynamic local amplifies high-resolution imaging system |
| CN114047626A (en) * | 2021-10-22 | 2022-02-15 | 北京理工大学 | Double-channel local high-resolution optical system based on DMD |
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