CN108873556B - Composite liquid crystal device for beam deflection - Google Patents
Composite liquid crystal device for beam deflection Download PDFInfo
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- CN108873556B CN108873556B CN201811026899.9A CN201811026899A CN108873556B CN 108873556 B CN108873556 B CN 108873556B CN 201811026899 A CN201811026899 A CN 201811026899A CN 108873556 B CN108873556 B CN 108873556B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 158
- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 230000010287 polarization Effects 0.000 claims abstract description 43
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000011521 glass Substances 0.000 claims abstract description 26
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 210000002858 crystal cell Anatomy 0.000 claims description 12
- 238000002834 transmittance Methods 0.000 claims description 7
- 239000005264 High molar mass liquid crystal Substances 0.000 claims description 3
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 3
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000010408 film Substances 0.000 description 45
- 239000010409 thin film Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000005811 Viola adunca Nutrition 0.000 description 1
- 240000009038 Viola odorata Species 0.000 description 1
- 235000013487 Viola odorata Nutrition 0.000 description 1
- 235000002254 Viola papilionacea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/292—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection by controlled diffraction or phased-array beam steering
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a composite liquid crystal device for beam deflection, comprising: the liquid crystal display device comprises a liquid crystal box of an adjustable liquid crystal half-wave plate, a medium film and a liquid crystal polarization grating; the liquid crystal box is used for controlling the rotation direction of incident circularly polarized light through electric control switching; the liquid crystal polarization grating is used for deflecting circularly polarized light after passing through the liquid crystal box; the liquid crystal box and the liquid crystal polarization grating share a glass substrate; the medium film is plated on the surface of the liquid crystal box, and the liquid crystal polarization grating is attached to the medium film; the dielectric film is transmissive to the operating wavelength of the composite liquid crystal device and reflective to the photo-alignment exposure wavelength. The composite liquid crystal device has compact structure and smaller thickness, improves the optical loss characteristic of the whole light beam deflection, and can prevent the photo-alignment structure in the liquid crystal box of the adjustable liquid crystal half-wave plate from being erased and written for the second time in the manufacturing process.
Description
Technical Field
The invention relates to the field of optical devices, in particular to a composite liquid crystal device for beam deflection.
Background
The liquid crystal polarization grating is used as a novel light beam deflection control device, has the excellent characteristics of large deflection angle, high diffraction efficiency, small volume, light weight, low power consumption, capability of performing electric control scanning by multiple cascade connection and the like, and has important application value in the fields of laser electric scanning, photoelectric imaging and detection, target tracking, laser sensing, space communication and the like.
When the existing liquid crystal polarization grating is used for beam deflection, a mode of stacking a plurality of liquid crystal polarization gratings is generally adopted to realize electric control scanning of a plurality of angles. As the number of deflection angles Q increases, the number of stacked liquid crystal polarization gratings N increases, and the quantitative relationship between them is: q=2 N. In applications where the number of deflection angles Q is very large, the number N of stacked liquid crystal polarization gratings is also increased to more than ten.
The loss of the light beam passing through the liquid crystal polarization grating device occurs, especially when the number N of stacked liquid crystal polarization gratings is large, the optical loss generated by stacking a plurality of liquid crystal polarization gratings becomes not negligible, and the overall thickness of the device becomes a problem to be considered, which becomes an important factor for restricting the further increase of the number of deflection angles of the light beam, and needs to be solved.
Disclosure of Invention
The embodiment of the invention provides a composite liquid crystal device for beam deflection. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
An embodiment of the present invention provides a composite liquid crystal device for beam deflection, including: a liquid crystal box of an adjustable liquid crystal half wave plate, a liquid crystal polarization grating and a dielectric film;
The liquid crystal box is used for controlling the rotation direction of incident circularly polarized light through electric control switching;
the liquid crystal polarization grating is used for deflecting circularly polarized light after passing through the liquid crystal box;
the liquid crystal box and the liquid crystal polarization grating share a glass substrate;
the medium film is plated on the surface of the liquid crystal box, and the liquid crystal polarization grating is attached to the medium film;
The dielectric film is transmissive to the operating wavelength of the composite liquid crystal device and reflective to the photo-alignment exposure wavelength.
Based on the composite liquid crystal device, as an optional first embodiment, the liquid crystal cell includes: an upper glass substrate, an upper conductive film, an upper liquid crystal alignment film, a liquid crystal layer, a lower liquid crystal alignment film, a lower conductive film and a lower glass substrate which are sequentially and closely attached along the normal direction;
the dielectric film is plated on the outer surface of the lower glass substrate.
Based on the first embodiment, as an optional second embodiment, two surfaces of the lower glass substrate perpendicular to the normal line are subjected to an optical polishing treatment.
Based on the first embodiment, as an optional third embodiment, the liquid crystal layer is a nematic liquid crystal layer, a dual-frequency liquid crystal layer, a network polymer liquid crystal layer, or a ferroelectric liquid crystal layer.
Based on the first embodiment, as an optional fourth embodiment, the liquid crystal polarization grating includes: a liquid crystal photo-alignment film and a liquid crystal polarization grating film which are tightly attached in sequence along the normal direction;
the liquid crystal photo-alignment film is attached to the dielectric film.
Based on the fourth embodiment, as an optional fifth embodiment, at least one of an outer surface of the upper glass substrate and an outer surface of the liquid crystal polarization grating film is plated with an optical antireflection film.
Based on the composite liquid crystal device, as an optional sixth embodiment, at least one of a surface of the liquid crystal cell on which light is incident and a surface of the liquid crystal polarization grating on which light is emitted is plated with an optical antireflection film.
Based on the composite liquid crystal device or the first embodiment, as an optional seventh embodiment, the transmittance of the dielectric thin film is higher than a first set value, and the reflectance of the dielectric thin film is higher than a second set value.
The composite liquid crystal device provided by the present exemplary embodiment achieves the following beneficial effects:
1. Because the liquid crystal box of the adjustable liquid crystal half wave plate and the liquid crystal polarization grating share one glass substrate, one glass substrate is omitted structurally, so that the optical loss is reduced, and the optical loss characteristic of the whole beam deflection is improved;
2. The structure is more compact, and the thickness of the device is reduced;
3. the dielectric film can prevent the photo-alignment structure inside the tunable liquid crystal half-wave plate from being written and erased twice when manufacturing the composite liquid crystal device.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a block diagram of a composite liquid crystal device in an exemplary embodiment;
FIG. 2 is a schematic diagram of the operation of the composite liquid crystal device of FIG. 1;
Fig. 3 is a cross-sectional view of a composite liquid crystal device in an exemplary embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. Various embodiments are described herein in a progressive manner, each embodiment focusing on differences from other embodiments, and identical and similar parts between the various embodiments are sufficient to be seen with each other.
In an exemplary embodiment, as shown in fig. 1, a composite liquid crystal device 200 for beam deflection includes: a liquid crystal cell 201 of an adjustable liquid crystal half wave plate, a dielectric film 203 and a liquid crystal polarization grating 202.
The liquid crystal box 201 of the adjustable liquid crystal half wave plate is used for controlling the rotation direction of incident circularly polarized light through electric control switching.
A liquid crystal polarization grating 202 for deflecting circularly polarized light after passing through the liquid crystal cell 201 of the tunable liquid crystal half-wave plate.
The liquid crystal cell 201 of the tunable liquid crystal half-wave plate and the liquid crystal polarization grating 202 share a single glass substrate.
A dielectric film 203 is plated on the surface of the liquid crystal cell 201 of the tunable liquid crystal half-wave plate, and a liquid crystal polarization grating 202 is attached to the dielectric film 203.
The dielectric film 203 is transmissive to the operating wavelength of the composite liquid crystal device 200 and reflective to the photo-alignment exposure wavelength. Optionally, the dielectric film 203 is a high-pass filter film. Alternatively, the working wavelength may be near infrared light with a longer wavelength, and the photo-alignment exposure wavelength may be blue-violet light with a shorter wavelength.
The photo-alignment exposure wavelength refers to the exposure wavelength of the photo-alignment material in the manufacturing process of the composite liquid crystal device 200.
Fig. 2 shows the operation principle of the composite liquid crystal device 200 in the present exemplary embodiment, and the composite liquid crystal device 200 is used in an electronically controlled scanning device. The linearly polarized light is changed into left-handed circularly polarized light after passing through a 1/4 wave plate which is placed in the 45-degree direction, after the left-handed circularly polarized light is incident into a liquid crystal box 201 of the adjustable liquid crystal half wave plate, electric control switching of two states of which the phase delay is 0 and pi can be realized based on voltage control, when the phase delay is 0, the left-handed circularly polarized light still keeps the left-handed circularly polarized light state, and when the left-handed circularly polarized light continuously enters into a liquid crystal polarization grating 202, the light beam direction is polarized, and the deflection direction is left. When the phase retardation is pi, the left circularly polarized light is changed into right circularly polarized light, and the light beam is polarized in the direction of the light beam and deflected in the right direction when the light beam is continuously incident on the liquid crystal polarization grating 202. Thus, the liquid crystal box 201 based on the adjustable liquid crystal half wave plate realizes the electric control scanning of the deflection direction of the light beam for the left-hand and right-hand conversion of the incident linearly polarized light.
The composite liquid crystal device 200 in the present exemplary embodiment achieves the following advantageous effects:
1. Because the liquid crystal box 201 of the adjustable liquid crystal half wave plate and the liquid crystal polarization grating 202 share one glass substrate, one glass substrate is omitted structurally, so that the optical loss is reduced, and the optical loss characteristic of the whole beam deflection is improved;
2. The structure is more compact, and the thickness of the device is reduced;
3. the dielectric film 203 prevents the photo-alignment structures inside the tunable liquid crystal half-wave plate from being written and erased twice during the fabrication of the composite liquid crystal device.
In an exemplary embodiment, as shown in fig. 3, a composite liquid crystal device 200 for beam deflection includes: a liquid crystal cell 201 of an adjustable liquid crystal half wave plate, a dielectric film 203 and a liquid crystal polarization grating 202.
The liquid crystal cell 201 of the tunable liquid crystal half-wave plate, which implements a polarization control function, may include: an upper glass substrate 211, an upper conductive film 212, a liquid crystal alignment film 213, a liquid crystal layer 214, a lower liquid crystal alignment film 215, a lower conductive film 216, and a lower glass substrate 217, which are closely attached in this order along the normal direction.
As an alternative embodiment, both the upper conductive film 212 and the lower conductive film 216 are transparent films.
As an alternative embodiment, both surfaces of the lower glass substrate 217 perpendicular to the normal line of the composite liquid crystal device 200, that is, the surface of the lower glass substrate 217 adjacent to the lower conductive film 216 and the surface adjacent to the dielectric film 203 may be subjected to an optical polishing process to be more suitable for adhesion.
As an alternative embodiment, the liquid crystal layer 214 may be a nematic liquid crystal layer, a dual frequency liquid crystal layer, a network polymer liquid crystal layer, or a ferroelectric liquid crystal layer.
The liquid crystal polarization grating 202, which implements a beam deflection function, may include: a liquid crystal photo-alignment film 218 and a liquid crystal polarization grating film 219 which are sequentially and closely bonded in the normal direction.
A liquid crystal photo-alignment film 218 is attached to the dielectric film 203.
The dielectric film 203 is plated on the outer surface of the lower glass substrate 217. The dielectric film 203 is transmissive to the operating wavelength of the composite liquid crystal device 200 and reflective to the photo-alignment exposure wavelength.
In view of the special structure of the composite liquid crystal device 200 in the present exemplary embodiment, the manufacturing process thereof is also specific. When the film included in the liquid crystal polarization grating 202 is manufactured, if the liquid crystal cell 201 of the tunable liquid crystal half-wave plate as a substrate is manufactured by adopting a parallel alignment mode by using a photo-alignment agent, the manufactured photo-alignment structure in the liquid crystal cell 201 of the tunable liquid crystal half-wave plate is damaged due to the light transmittance of the glass substrate when the microstructure pattern exposure is performed on the film included in the liquid crystal polarization grating 202. Therefore, the dielectric thin film 203 is coated on the outer surface of the lower glass substrate 217 in order to perform the secondary erasing protection on the photo-alignment structure.
Further, as an alternative embodiment, the transmittance of the dielectric thin film 203 is higher than the first set value, and the reflectance of the dielectric thin film 203 is higher than the second set value. The first and second set values may be set to a value that is conventionally used or a value that is higher than conventionally used, thereby making the dielectric thin film 203 have a high transmittance for the operating wavelength of the composite liquid crystal device 200 and a high reflectance for the photo-alignment exposure wavelength. For example, the working wavelength of the composite liquid crystal device 200 for beam electrical scanning is 1550 nm, the exposure wavelength of the photo-alignment material in the manufacturing process is 405 nm, and the nano-dielectric film 203 may have high transmittance for the wavelength 1550 nm and high reflectance for the wavelength 405 nm.
As an alternative embodiment, at least one of the outer surface of the upper glass substrate 211 and the outer surface of the liquid crystal polarization grating film 219 is plated with an optical anti-reflection film to reduce the loss due to fresnel reflection on the surface of the composite liquid crystal device, so as to improve the transmittance of the entire composite liquid crystal device 200.
With the composite liquid crystal device 200 in the present exemplary embodiment, when 1 is used, electric control selection of two mirror angles with the device normal direction as the symmetry axis can be achieved, and when N is used in series, electric control selection of 2 N angles can be achieved.
It is to be understood that the invention is not limited to the arrangements and instrumentality shown in the drawings and described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A composite liquid crystal device for beam deflection, comprising: a liquid crystal box of an adjustable liquid crystal half wave plate, a liquid crystal polarization grating and a dielectric film;
The liquid crystal box is used for controlling the rotation direction of incident circularly polarized light through electric control switching;
the liquid crystal polarization grating is used for deflecting circularly polarized light after passing through the liquid crystal box;
the liquid crystal box and the liquid crystal polarization grating share a glass substrate;
the medium film is plated on the surface of the liquid crystal box, and the liquid crystal polarization grating is attached to the medium film;
The dielectric film is transmissive to the operating wavelength of the composite liquid crystal device and reflective to the photo-alignment exposure wavelength.
2. The composite liquid crystal device of claim 1, wherein the liquid crystal cell comprises: an upper glass substrate, an upper conductive film, an upper liquid crystal alignment film, a liquid crystal layer, a lower liquid crystal alignment film, a lower conductive film and a lower glass substrate which are sequentially and closely attached along the normal direction;
the dielectric film is plated on the outer surface of the lower glass substrate.
3. The composite liquid crystal device according to claim 2, wherein both surfaces of the lower glass substrate perpendicular to the normal line are subjected to an optical polishing treatment.
4. The composite liquid crystal device of claim 2, wherein the liquid crystal layer is a nematic liquid crystal layer, a dual-frequency liquid crystal layer, a network polymer liquid crystal layer, or a ferroelectric liquid crystal layer.
5. The composite liquid crystal device of claim 2, wherein the liquid crystal polarization grating comprises: a liquid crystal photo-alignment film and a liquid crystal polarization grating film which are tightly attached in sequence along the normal direction;
the liquid crystal photo-alignment film is attached to the dielectric film.
6. The composite liquid crystal device according to claim 5, wherein at least one of an outer surface of the upper glass substrate and an outer surface of the liquid crystal polarization grating film is plated with an optical antireflection film.
7. The composite liquid crystal device of claim 1, wherein at least one of a surface of the liquid crystal cell on which light is incident and a surface of the liquid crystal polarization grating on which light is emitted is plated with an optical antireflection film.
8. A composite liquid crystal device according to claim 1 or 2, wherein the dielectric film has a transmittance higher than a first set value and the dielectric film has a reflectance higher than a second set value.
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| CN201811026899.9A CN108873556B (en) | 2018-09-04 | 2018-09-04 | Composite liquid crystal device for beam deflection |
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| CN201811026899.9A CN108873556B (en) | 2018-09-04 | 2018-09-04 | Composite liquid crystal device for beam deflection |
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| CN108873556B true CN108873556B (en) | 2024-09-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109375426B (en) * | 2018-12-14 | 2021-06-25 | 中国科学院长春光学精密机械与物理研究所 | Single-side orientation active liquid crystal polarization grating structure and preparation method thereof |
| CN110058345B (en) * | 2019-03-28 | 2022-07-08 | 深圳市速腾聚创科技有限公司 | Scanning structure and control method thereof |
| CN110133865B (en) * | 2019-04-18 | 2021-03-26 | 深圳市麓邦技术有限公司 | Imaging direction selecting apparatus and method thereof |
| US20210048695A1 (en) * | 2019-08-14 | 2021-02-18 | GM Global Technology Operations LLC | Image scanning using stationary optical elements |
| CN110609426B (en) * | 2019-09-24 | 2022-02-01 | 重庆晶朗光电有限公司 | Electric control light beam deflection device, cascade structure and light beam deflection driving method |
| CN111308483B (en) * | 2019-11-28 | 2024-09-13 | 深圳市麓邦技术有限公司 | Laser ranging method and device for laser ranging |
| CN111025737B (en) * | 2019-12-23 | 2021-11-23 | 中国兵器装备研究院 | Electric scanning continuous light beam orientation device |
| CN112965279A (en) * | 2021-03-18 | 2021-06-15 | 歌尔股份有限公司 | Focusing optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN208737174U (en) * | 2018-09-04 | 2019-04-12 | 洛伦兹（北京）科技有限公司 | Compound liquid-crystal device for light beam deflection |
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| JP2008070508A (en) * | 2006-09-13 | 2008-03-27 | Seiko Epson Corp | Liquid crystal device and electronic equipment |
| KR20080046321A (en) * | 2006-11-22 | 2008-05-27 | 삼성전자주식회사 | Array substrate, liquid crystal display device having the array substrate and method of manufacturing the array substrate |
| CN101681064B (en) * | 2007-04-16 | 2013-05-01 | 北卡罗莱纳州立大学 | Methods of fabricating switchable liquid crystal polarization gratings on reflective substrates and related devices |
| CN104155810B (en) * | 2014-07-22 | 2017-01-25 | 京东方科技集团股份有限公司 | Mask |
| CN106959547B (en) * | 2017-03-09 | 2019-08-16 | 苏州晶萃光学科技有限公司 | A kind of liquid crystal beam deviation and scanner and method |
| CN106990618B (en) * | 2017-06-05 | 2019-11-26 | 京东方科技集团股份有限公司 | Array substrate and its manufacturing method, display panel and display device |
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| CN208737174U (en) * | 2018-09-04 | 2019-04-12 | 洛伦兹（北京）科技有限公司 | Compound liquid-crystal device for light beam deflection |
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