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WO2000026720A1 - Filtre fabry-perot accordable en fonction de la longueur d'onde, insensible a la polarisation, avec cristaux liquides nematiques - Google Patents

Filtre fabry-perot accordable en fonction de la longueur d'onde, insensible a la polarisation, avec cristaux liquides nematiques Download PDF

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Publication number
WO2000026720A1
WO2000026720A1 PCT/KR1999/000654 KR9900654W WO0026720A1 WO 2000026720 A1 WO2000026720 A1 WO 2000026720A1 KR 9900654 W KR9900654 W KR 9900654W WO 0026720 A1 WO0026720 A1 WO 0026720A1
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WIPO (PCT)
Prior art keywords
liquid crystal
filter
substrates
coated
nematic liquid
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Ceased
Application number
PCT/KR1999/000654
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English (en)
Inventor
Sin Doo Lee
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SMARTDISPLAY CO Ltd
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SMARTDISPLAY CO Ltd
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Filing date
Publication date
Application filed by SMARTDISPLAY CO Ltd filed Critical SMARTDISPLAY CO Ltd
Priority to AU10800/00A priority Critical patent/AU1080000A/en
Priority to EP99954458A priority patent/EP1127292A1/fr
Priority to JP2000580044A priority patent/JP2002529768A/ja
Priority to CA002348880A priority patent/CA2348880A1/fr
Publication of WO2000026720A1 publication Critical patent/WO2000026720A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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 
    • G02F1/21—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  by interference
    • G02F1/216—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  by interference using liquid crystals, e.g. liquid crystal Fabry-Perot filters
    • 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
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells

Definitions

  • the present invention relates to a polarization insensitive Fabry-Perot wavelength tunable filter with a nematic liquid crystal and, more particularly, to a polarization insensitive Fabry-Perot wavelength tunable filter with a nematic liquid crystal in an axially symmetrical configuration in a transmissive or reflective mode, whose wavelength tuning property is completely independent of the polarization state of the input light, so that the FP wavelength tunable filter can provide a low operating voltage, a wide range of wavelength tuning, and simple fabrication .
  • a Fabry-Perot wavelength tunable filter with a nematic liquid crystal which uses the electro-optic effect of a liquid crystal, is constructed in such a manner that dielectric mirrors having a high reflective index in the operation wavelength range are coated on the inner surfaces of two glass substrates, alignment layers for aligning the liquid crystal are coated on the dielectric mirrors, and the liquid crystal is inserted between the two glass substrates to be aligned.
  • This structure in which the dielectric mirrors face to each other is called a Fabry-Perot structure which selectively transmits the light with a specific wavelength.
  • the wavelength dependence of the light transmitted in the Fabry-Perot structure is given by
  • t 2 1 ⁇ ( ⁇ ) ⁇ ( 1 ) d- ⁇ - )2 1 + r sin 2 (- ⁇ nd) (1-r) 2 ⁇
  • t and r represent the transmittance and the reflectance of the dielectric mirror, respectively.
  • ⁇ denotes the wavelength of the incident light
  • This condition represents that the transmission depends on the wavelength of the incident light, meaning that the Fabry-Perot structure can be used as a wavelength tuning filter which selectively transmits the light with a specific wavelength.
  • This Fabry-Perot filter has wavelength tuning capability of controlling the transmission peak by varying the refractive index ( n ) or the thickness (d) of the material .
  • a conventional Fabry-Perot wavelength tuning filter mostly uses an electro-mechanical material or inorganic electro-optical material. When the electro-mechanical material exists between the two dielectric mirrors, the distance d between the dielectric mirrors is controlled as a function of the applied voltage so as to tune the wavelength of the light transmitted.
  • the refractive index n is varied with the applied voltage so as to tune the wavelength of the transmitted light.
  • a nonlinear optical material has been used to change the refractive index n according to the intensity of the incident light, resulting in the wavelength tunability of the transmitted light.
  • a wavelength tuning Fabry-Perot filter using a nematic liquid crystal can be used as a high density wavelength-division- multiplexing (HD-WDM) device in the next-generation optical communications because of its low operation voltage, wide wavelength selection range, and simple fabrication, compared with the conventional filter using the electro-mechanical or inorganic electro-optical material.
  • the wavelength tuning property of the conventional liquid crystal Fabry-Perot structure with homogeneous alignment is sensitive to the polarization direction of the incident light.
  • the wavelength having the maximum transmission depends on the polarization direction of incident light, which can be seen from the above Eq. (1) .
  • This polarization dependence gives lots of limitations to application of the wavelength tunable filter when the actual polarization state of an optical fiber is difficult to predict in the field of optical communications.
  • the nematic liquid crystal has at least two aligned regions orthogonal to each other, and incident light passes simultaneously through these two regions.
  • the optical anisotropies of the two aligned regions should be cancelled exactly with each other to remove the polarization dependence.
  • the process of fabricating such multidomain structure is complicated more than that of fabricating the homogeneous alignment structure. In other words, at least two alignment processes using optical masks are required for obtaining the multidomain structure having two different alignment directions.
  • the polarization dependence still exists depending on the size of the two regions on which the light is incident.
  • the present invention is directed to a polarization insensitive Fabry-Perot wavelength tunable filter with a nematic liquid crystal that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a Fabry- Perot wavelength tunable filter with a nematic liquid crystal, which has the excellent wavelength selection properties such as a wide wavelength tunability and complete removal of the polarization dependence of incident light using axially symmetrical alignment.
  • a polarization insensitive Fabry-Perot wavelength tunable filter with a nematic liquid crystal in which two substrates are coated with transparent electrodes and -dielectric mirrors, respectively.
  • One of two substrates has a homeotropic alignment layer coated thereon, and the other has a homogeneous alignment layer coated thereon which the liquid crystal is axially aligned.
  • a nematic liquid crystal having the positive dielectric anisotropy is inserted between the two substrates to tune the wavelength of the incident light depending on the magnitude of the voltage applied thereto.
  • a nematic liquid crystal having the negative dielectric anisotropy may be employed instead of the nematic liquid crystal having the positive dielectric anisotropy.
  • the pretilt angle at the homogeneous alignment layer is ⁇ l 0° ⁇ 6 ⁇ 10° is satisfied, and when the pretilt angle at the homeotropic alignment layer is ⁇ 2 , 75° ⁇ 2 ⁇ 90° is satisfied.
  • the pretilt angle at the homogeneous alignment layer satisfies 0° ⁇ 1 ⁇ 15°, and the pretilt angle at the homeotropic alignment layer satisfies 80° ⁇ : ⁇ 90°.
  • a polarization plate or an optical compensation film may be attached to at least one of the outer surfaces of the substrates.
  • Fig. 1 is a cross-sectional view showing a Fabry-Perot wavelength tunable filter using a nematic liquid crystal according to the present invention
  • Fig. 2 is a perspective view showing the polarization insensitive Fabry-Perot wavelength tunable filter using a nematic liquid crystal according to the present invention
  • Fig. 3 shows the coordinate system of the liquid crystal director in the Fabry-Perot wavelength tunable filter using a nematic liquid crystal
  • Fig. 4 shows the symmetrical relation between the geometry of the liquid crystal director on an axially aligned lower substrate and the polarization direction of the linearly polarized incident light
  • Fig. 5 shows the polarization dependence of the incident light in the Fabry-Perot wavelength tunable filter using the homeotrpically axially aligned nematic liquid crystal E7;
  • Fig. 6 shows the wavelength tuning property as a function of the applied voltage in the Fabry-Perot wavelength tunable filter using the homeotropically axially aligned nematic liquid crystal E7;
  • Fig. 7 illustrates the continuous wavelength tuning property actually applied in Fig. 6.
  • Fig. 1 is a cross-sectional view showing a polarization insensitive Fabry-Perot wavelength tunable filter using a nematic liquid crystal according to the present invention
  • Fig. 2 is a perspective view showing the polarization insensitive Fabry- Perot wavelength tunable filter using a nematic liquid crystal according to the present invention. As shown in Figs.
  • a homogeneous alignment material of the liquid crystal (AL-1051 ; Japan Synthetic Rubber Co., pretilt angle ⁇ 2°) is coated on the inner surface of one substrate to be axially aligned, and a homeotropic alignment material (JALS-204 ; Japan Synthetic Rubber Co., pretilt angle ⁇ - ⁇ 90 0 ) is coated on the inner surface of the other substrate.
  • This new alignment structure is symmetrical in all directions for an arbitrary incident polarization with respect to the normal incidence, so that the polarization dependence of the transmission property is completely removed.
  • a material such as indium-tin-oxide (ITO) is coated on the upper and the lower substrates 1 to form transparent electrodes 2, and reflecting layers (dielectric mirrors) 3 are respectively coated on transparent electrodes 2, reflecting layers 3 having a high reflectance (above 98%) in the wavelength range where the Fabry-Perot filter of the present invention to be used.
  • An alignment layer 4 for homeotropically aligning the liquid crystal is coated on the reflecting layer 3 formed on one substrate, and alignment layer 5 for homogeneously aligning the liquid crystal is coated on the reflecting layer 3 formed on the other substrate.
  • the homogeneous alignment layer 5 is additionally treated to produce axially symmetrical alignment with respect to the direction perpendicular to its surface.
  • the surface treatment for axial alignment can be accomplished by axial rubbing or illuminating a circularly polarized ultraviolet light on an optical alignment layer.
  • axially symmetrical rubbing is performed to allow the liquid crystal molecules to have axially symmetrical arrangement.
  • the thickness between the two substrates is maintained using a spacer 6 for having an appropriate distance.
  • This new alignment structure is axially symmetrical so that it can always show the transmission property insensitive to the polarization of the light in an arbitrary direction incident thereon.
  • Fig. 3 shows the coordinate system of the liquid crystal director in the Fabry- Perot wavelength tunable filter using a nematic liquid crystal.
  • the thickness of the liquid crystal layer is defined as d
  • the tilt angle of the liquid crystal director to the substrate surface at an arbitrary point on the z axis is defined as ⁇ ( z )
  • the following Eq. (2) represents the effective refractive index for a ray of light with polarization parallel to the direction projected by the liquid crystal director onto the substrate surface when the light is incident on the surface of the device.
  • the effective refractive index becomes n e when the tilt angle is 0°, that is, when the liquid crystal is homogeneously aligned.
  • the effective refractive index becomes n 0 when the tilt angle is 90°, that is, when the liquid crystal is homeotropically aligned.
  • the effective refractive index at an arbitrary point in the liquid crystal layer can be calculated according to the Eq. (2) .
  • Fig. 4 shows the symmetrical relation between the geometry of the liquid crystal director on the axially aligned lower substrate and the polarization direction of the incident light polarized linearly.
  • a laboratory coordinate system is defined as the x-y coordinate system
  • a ray of light which is linearly polarized at the angle of ⁇ : to the x axis over the entire liquid crystal layer, is incident along the surface normal of the device
  • the polarization at a position where the radial direction makes an angle ⁇ to the x axis with the symmetry axis located in the center can be represented by the sum of two components, one of which sin ⁇ ⁇ - ⁇ 0 ) is parallel to the liquid crystal director and the other cos( ⁇ - ⁇ ) perpendicular to it.
  • Tn 0 is independent of the magnitude of the voltage applied to the device, and only Tn eff depends on it.
  • the sum of the two values, given by the average value T is always independent of the angle ⁇ 0 of incident polarization because of the axially symmetric alignment of the liquid crystal molecules.
  • the tilt angle ⁇ ⁇ Z) of the liquid crystal director which varies continuously from one substrate to the other substrate, can be numerically calculated in the elastic continuum theory of liquid crystals.
  • the transmission property of the liquid crystal Fabry-Perot wavelength tunable filter can be theoretically calculated from the tilt angle profiles as described above. Based on the theoretical results, the material constants of the liquid crystal and the device parameters can be optimized.
  • Table 1 illustrates the specification of the device parameters, and Figs. 5, 6 and 7 show experimental results of the device having the specification presented in the Table 1.
  • the nematic liquid crystal E7 containing no chiral additive.
  • Fig. 5 shows the polarization dependence of the incident light in the polarization insensitive Fabry-Perot wavelength tunable filter using the homeotropically axially aligned nematic liquid crystal E7.
  • the transmission property of the device is independent of the polarization of the incident light.
  • (I), (II), and (III) of Fig. 5 correspond to the cases that the angles between the polarization direction of the incident light and an arbitrary reference direction are 0°, 45° and 90°, respectively.
  • Fig. 6 shows the wavelength tuning property as a function of the applied voltage in the polarization insensitive Fabry- Perot wavelength tunable filter using the homeotropically axially aligned nematic liquid crystal E7.
  • Fig. 6 shows the wavelength tuning property as a function of the applied voltage in the polarization insensitive Fabry- Perot wavelength tunable filter using the homeotropically axially aligned nematic liquid crystal E7.
  • the polarization component perpendicular to the liquid crystal director i.e., the corresponding refractive index is n 0 .
  • the effective refractive index n eff is varied as function of the magnitude of the applied voltage, resulting in the change of the wavelength having the maximum transmitted intensity.
  • the molecules When the liquid crystal has the positive dielectric anisotropy, the molecules tend to orient along the direction parallel to the applied electric field. This orientation of the liquid crystal molecules changes the magnitude of the effective refractive index, and the wavelength of the transmitted varies continuously as a function of the applied voltage through the Fabry-Perot structure.
  • Fig. 7 illustrates the continuous wavelength tuning property actually applied m Fig. 6. This shows that the mode whose tuning wavelengtn ranges from 152 ⁇ nm to 1551nm and the mode whose tu">-.ng wavelength ranges from 1541nm to 1560nm can be selectively tuned when the applied voltage varies from 2V to 7V.
  • a polarization plate or an optical compensation film for controlling the characteristics of the transmitted light intensity may be attached to one of the surfaces of the substrates, if required. Furthermore, it is preferable that an antireflectmg layer preventing reflection in the range of wavelength to be used is coated on one of the outer surfaces of the two substrates in order to improve transmission efficiency.
  • the transmission or reflection property is completely insensitive to the polarization of the incident light m the whole operation voltage range, compared with the conventional homogeneous alignment structure.
  • the fabrication process of the device is much simpler than that of the conventional multidomain structure. Therefore, the present invention is able to provide the polarization insensitive Fabry-Perot wavelength tunable filter with a nematic liquid crystal, which has no polarization dependence of the incident light for the transmitted light, low operating voltage, relatively wide wavelength tuning range, and simple fabrication process .

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un filtre Fabry-Perot accordable en fonction de la longueur d'onde, insensible à la polarisation, avec cristaux liquides nématiques, dans lequel des électrodes transparentes (2) sont formées sur les surfaces internes de deux substrats (1). Des couches réfléchissantes (3) sont appliquées sur ces électrodes transparentes (2). L'une de ces couches présente une couche d'alignement homéotropique (4) assurant l'alignement homéotropique des cristaux liquides, l'autre de ces couches est recouverte d'une couche d'alignement homogène (5) traitée de manière à assurer l'alignement axial des cristaux liquides. Intercalé entre les deux substrats (1), un cristal liquide nématique règle la longueur d'onde de la lumière incidente en fonction de l'importance de la tension appliquée à ces substrats. Ce filtre Fabry-Perot se caractérise en ce que sa faculté de transmission est totalement insensible au sens de polarisation de la lumière incidente sur toute la plage de tensions de fonctionnement.
PCT/KR1999/000654 1998-11-02 1999-11-02 Filtre fabry-perot accordable en fonction de la longueur d'onde, insensible a la polarisation, avec cristaux liquides nematiques Ceased WO2000026720A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU10800/00A AU1080000A (en) 1998-11-02 1999-11-02 Polarization insensitive fabry-perot wavelength tunable filter with nematic liquid crystal
EP99954458A EP1127292A1 (fr) 1998-11-02 1999-11-02 Filtre fabry-perot accordable en fonction de la longueur d'onde, insensible a la polarisation, avec cristaux liquides nematiques
JP2000580044A JP2002529768A (ja) 1998-11-02 1999-11-02 ネマティック液晶を使用した偏光安定ファブリペロー波長可変フィルタ
CA002348880A CA2348880A1 (fr) 1998-11-02 1999-11-02 Filtre fabry-perot accordable en fonction de la longueur d'onde, insensible a la polarisation, avec cristaux liquides nematiques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019980046836A KR100284647B1 (ko) 1998-11-02 1998-11-02 네마틱 액정 파브리-페로 파장 가변 필터 장치
KR1998/46836 1998-11-02

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Publication Number Publication Date
WO2000026720A1 true WO2000026720A1 (fr) 2000-05-11

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Country Status (7)

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EP (1) EP1127292A1 (fr)
JP (1) JP2002529768A (fr)
KR (1) KR100284647B1 (fr)
CN (1) CN1325502A (fr)
AU (1) AU1080000A (fr)
CA (1) CA2348880A1 (fr)
WO (1) WO2000026720A1 (fr)

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US20150009450A1 (en) * 2013-07-02 2015-01-08 Shenzhen China Star Optoelectronics Technology Co. Ltd. Double layer liquid crystal (lc) fabry-perot (fp) filter display device
US9400412B2 (en) 2014-07-16 2016-07-26 Kent State University Nanosecond liquid crystalline optical modulator

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KR100500690B1 (ko) * 2002-01-18 2005-07-12 비오이 하이디스 테크놀로지 주식회사 Ｓａｎ 모드 액정표시소자
CN100373204C (zh) * 2003-07-11 2008-03-05 中国科学院上海光学精密机械研究所 可调节位相型光瞳滤波器及其制作方法
KR101237284B1 (ko) * 2011-05-09 2013-02-27 주식회사 포벨 파장 가변 필터의 제작 방법
JP5624522B2 (ja) * 2011-07-19 2014-11-12 株式会社東芝 表示装置及びその製造方法
CN102955279A (zh) * 2012-06-18 2013-03-06 天津奇谱光电技术有限公司 一种可调谐法布里-珀罗滤波器
CN102799013A (zh) * 2012-09-05 2012-11-28 天津奇谱光电技术有限公司 一种偏振无关的可调谐法布里-珀罗滤波器
CN103364975A (zh) * 2013-01-17 2013-10-23 苏州多谱激光科技有限公司 组合可调型滤波器
CN103197450A (zh) * 2013-04-11 2013-07-10 上海理工大学 基于导模共振液晶结构的偏振无关滤波器
CN103293760B (zh) * 2013-07-02 2015-06-03 深圳市华星光电技术有限公司 基于双层液晶法布里珀罗滤波器模组的显示装置
CN110441936B (zh) * 2019-08-14 2022-05-13 京东方科技集团股份有限公司 一种滤波器、滤波装置、滤波器的驱动方法及其制备方法
US11137655B2 (en) * 2020-02-14 2021-10-05 Facebook Technologies, Llc Resonant liquid crystal devices

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US5068749A (en) * 1990-08-31 1991-11-26 Bell Communications Research, Inc. Electronically tunable polarization-independent liquid crystal optical filter
US5111321A (en) * 1990-10-16 1992-05-05 Bell Communications Research, Inc. Dual-polarization liquid-crystal etalon filter
US5425115A (en) * 1994-07-18 1995-06-13 Martin Marietta Corporation Polarization insensitive optical switch

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EP0260073A2 (fr) * 1986-09-05 1988-03-16 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Méthode pour l'obtention d'une modulation optique
US5068749A (en) * 1990-08-31 1991-11-26 Bell Communications Research, Inc. Electronically tunable polarization-independent liquid crystal optical filter
US5111321A (en) * 1990-10-16 1992-05-05 Bell Communications Research, Inc. Dual-polarization liquid-crystal etalon filter
US5425115A (en) * 1994-07-18 1995-06-13 Martin Marietta Corporation Polarization insensitive optical switch

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Publication number Priority date Publication date Assignee Title
US20150009450A1 (en) * 2013-07-02 2015-01-08 Shenzhen China Star Optoelectronics Technology Co. Ltd. Double layer liquid crystal (lc) fabry-perot (fp) filter display device
US9291867B2 (en) * 2013-07-02 2016-03-22 Shenzhen China Star Optoelectronics Technology Co., Ltd Double layer liquid crystal (LC) fabry-perot (FP) filter display device
US9400412B2 (en) 2014-07-16 2016-07-26 Kent State University Nanosecond liquid crystalline optical modulator

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AU1080000A (en) 2000-05-22
EP1127292A1 (fr) 2001-08-29
CA2348880A1 (fr) 2000-05-11
CN1325502A (zh) 2001-12-05
KR20000031039A (ko) 2000-06-05
KR100284647B1 (ko) 2001-03-15

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