CN101382684A - Polarization insensitivity liquid crystal photon crystal filter and making method thereof - Google Patents
Polarization insensitivity liquid crystal photon crystal filter and making method thereof Download PDFInfo
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- CN101382684A CN101382684A CNA2008101371342A CN200810137134A CN101382684A CN 101382684 A CN101382684 A CN 101382684A CN A2008101371342 A CNA2008101371342 A CN A2008101371342A CN 200810137134 A CN200810137134 A CN 200810137134A CN 101382684 A CN101382684 A CN 101382684A
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Abstract
The invention provides a polarization insensitive liquid crystal photonic crystal filter and a manufacturing method thereof. The filter comprises three glass substrates, wherein, one internal glass substrate is positioned in the middle and two external glass substrates are positioned at the two sides of the internal glass substrate; the inner sides of the two external glass substrates and the two sides of the internal glass substrate are plated with ITO electrode films which are alternately plated with multilayer films of silicon dioxide and titanium dioxide; the multilayer films are printed with oriented films which are subject to directional friction treatment and cause the friction directions of the opposite glass substrates to be antiparallel and overlaid; isolation pads used for controlling the thickness of the liquid crystal layers are arranged among all glass substrates and pure nematic phase liquid crystals with larger anisotropism difference of refractive index are injected among all glass substrates; the two liquid crystal layers are arranged in an antiparallel manner respectively and the arrangement directions of the two layers are vertical; and the peripheries of the glass substrates are provided with a sealing structure. The crystal filter and the manufacturing method have the advantages of low cost, low driving voltage, large tuning range, high tuning precision and good repeatability, being easy to control, and the like.
Description
(1) technical field
What the present invention relates to is a kind of liquid crystal photon crystal filter, particularly a kind of polarization insensitivity liquid crystal photon crystal filter that is used for dense wavelength division multiplexing device system.The invention still further relates to the preparation method of this liquid crystal photon crystal filter.
(2) background technology
In advanced information society, along with needs information transmitted amount constantly increases, people also improve constantly the requirement of communication network.Dense wave division multipurpose (DWDM) technology provides at a high speed, the best mode of high-capacity optical fiber communication system, along with the fast development of DWDM in optical communication system, the required port number that holds of simple optical fiber is more and more, for the some wavelength in the hyperchannel are handled, just must use multiplexing and demodulation multiplexer.Realization at present is multiplexing and method demodulation multiplexer is a lot, mainly contain Thin Film Filter, array waveguide grating etc., but these all is untunable wave filter.Yet following optical-fiber network will be towards intelligence, flexible and configurability aspect development, and the wave filter that possesses tunable function is the important devices that realizes this trend.The tunable optic filter of research mainly comprises now: acousto-optic tunable filter, piezoelectric ceramics Fabry-Bo Luo Gan relates to wave filter, mach zhender interference filter etc.The acousto-optic tunable filter tunable range is greater than 100 nanometers, but their bandwidth is narrow inadequately.The piezoelectric ceramics Fabry. glass Luo Gan relates to wave filter, though enough big tunable range and narrow bandwidth are arranged, owing to require very high bearing accuracy to make that making is very difficult.The mach zhender interference filter has very narrow bandwidth, but not enough by the degree of depth.With respect to above several wave filters, liquid crystal photon crystal filter has the following advantages: simple in structure, low-voltage driving, do not have mechanical motion, easy of integration, volume is little, easy diversification, cost are low, obtain easily and good filtering performance etc.This makes it in the optical communication field good application prospects be arranged.
Photonic crystal is the artificial material that the specific inductive capacity space periodicity is arranged, identical magnitude with optical wavelength of its cycle.It exists photon band gap or forbidden photon band, and promptly the light wave that is in the photon band gap of frequency can not be propagated in photonic crystal, and also can be understood as the light wave that frequency is arranged in band gap will be the Bragg reflection by the photonic crystal total reflection.If in photonic crystal, introduce the defective of certain form, imperfect tape will appear in then original photon band gap, and defects property will have a deep effect on the character of imperfect tape, and then influence the optical property of photon crystal device.Liquid crystal photon crystal filter promptly is to utilize the defect layer of liquid crystal as photonic crystal, by applying the method for electric field, reaches the purpose of tunable wave length.
Because liquid crystal molecule has birefringent characteristic, so the use of liquid crystal photon crystal filter inevitably is accompanied by the use of polaroid in the tradition, promptly polaroid cooperates the direction of orientation of liquid crystal to use.In the application of some nonpolarized lights, because the use of polaroid can reduce luminous energy.Even in the system of polarized light, such as in optical communication, the inside of optical fibre polarization state of light is unknowable, when using liquid crystal device, still to add corresponding polaroid in its front and back like this according to the aligned of liquid crystal, therefore can make still that luminous energy reduces, and increased the complicacy of system, reduced system flexibility.In a word, because following point can appear in the use of polarized light: one, cause signal energy to reduce, influence transmission range; Two, increase system complexity, the system that makes is difficult for realizing; Three, reduced the usable range of liquid crystal photon crystal filter.
(3) summary of the invention
The object of the present invention is to provide a kind of driving voltage low, stablize good reproducibility, can be in optimum Working, be easy to carry out computer-controlled polarization insensitivity liquid crystal photon crystal filter 5～35 ℃ of temperature ranges.The present invention also aims to provide a kind of method for making of polarization insensitivity liquid crystal photon crystal filter.
The object of the present invention is achieved like this:
The structure of polarization insensitivity liquid crystal photon crystal filter of the present invention is formed and is comprised three sheet glass substrates, in the middle of glass substrate is positioned in a slice, two outer glass substrates are positioned at the both sides of glass substrate, the inboard of two outer glass substrates, the both sides of a slice glass substrate have been coated with tin indium oxide (ITO) electrode film, on all ITO electrode films, alternately be coated with the multilayer film of silicon dioxide and titania respectively, on all multilayer films, be printed with alignment films, described alignment films is handled through rubbing, and make frictional direction antiparallel on the relative glass substrate to folded, the chock insulator matter that the control thickness of liquid crystal layer is arranged between each glass substrate, be marked with the bigger pure nematic liquid crystal of refractive index anisotropy difference, two liquid crystal layers are antiparallel orientations respectively and arrange, and both orientations are perpendicular, and the periphery of glass substrate has hermetically-sealed construction.
Polarization insensitivity liquid crystal photon crystal filter of the present invention is to adopt such method to make:
(1) flatness is better than three transparent glass substrates of 1/10 wavelength on the selective transmission beam area, and the inboard of glass substrate both sides and two outer glass substrates in a slice is coated with tin indium oxide (ITO) electrode film therein;
(2), alternately be coated with the silicon dioxide and the titanium dioxide film formation multilayer film of the identical number of plies respectively by the optical thickness of 1550 nanometers in the ITO electrode film side of three sheet glass substrates;
(3) on the multilayer film of three sheet glass substrates, print polyimide (PI) alignment films respectively, after heat-treating by liquid crystal device technology, on rubbing machine, make the rubbing alignment films;
(4) chock insulator matter of 500 nanometers is sprayed in the inboard of glass substrate outside, and three sheet glass substrates are involutory by the alignment films side, concora crush three sheet glass substrates, and use envelope frame adhesive curing Cheng Ping;
(5) injecting the refractive index anisotropy value in screen is 0.1～0.3 pure nematic liquid crystal, seals, and finishes the making of polarization insensitivity liquid crystal photon crystal filter.
This polarization insensitivity liquid crystal photon crystal filter of the present invention's preparation, driving voltage is lower than 10 volts, stablizes good reproducibility, can be in optimum Working 5～35 ℃ of temperature ranges, is easy to carry out computer control.
(4) description of drawings:
Fig. 1 is the structural representation of polarization insensitivity liquid crystal photon crystal filter among the present invention.
(5) embodiment
(1) selecting three thickness is that 1.1 millimeters, flatness are better than 1/10 wavelength, area is the clean transparent glass substrate of 1 centimetre of 1 cm x, and two of the both sides of a slice and others' is one-sided therein, is coated with tin indium oxide (ITO) electrode film;
(2) utilize H447700-7 molding box formula coating machine, in the ITO of three plate bases side, alternately being coated with thickness respectively is the silicon dioxide and the titanium dioxide film of 265 nanometers and 165 nanometers, plates 5 pairs altogether;
(3) print SE-410 type polyimide (PI) film of 110 nanometers in multilayer film one side of tri-electrode, solidification temperature was handled 10 minutes under 80 degree conditions, handled 30 minutes under 180 degree conditions subsequently.With the PI film side of substrate, carry out rubbing on the rubbing machine of flannelette and handle having after the thermal treatment;
(4), spray the chock insulator matter of last 500 nanometer diameters in the PI of three plate bases film side;
(5) it is involutory three plate bases to be pressed the chock insulator matter side, and the frictional direction that makes alignment films on relative substrate antiparallel each other, and the orientation of biliquid crystal layer is perpendicular, printing envelope screen glue on substrate, and leave liquid crystal injecting port;
(6) injecting wave band in screen is 0.19 pure nematic liquid crystal (RDP-92975, big Japanese ink company) near infrared refractive index anisotropy value, seals, and finishes the making of liquid crystal display, promptly forms polarization insensitivity liquid crystal photon crystal filter.
In conjunction with Fig. 1, adopt the structure composition of the polarization insensitivity liquid crystal photon crystal filter of method making of the present invention to comprise three sheet glass substrates 1, in the middle of glass substrate is positioned in a slice, two outer glass substrates are positioned at the both sides of glass substrate, the inboard of two outer glass substrates, the both sides of a slice glass substrate have been coated with tin indium oxide (ITO) electrode film 2, on all ITO electrode films, alternately be coated with the multilayer film of silicon dioxide 4 and titania 5 respectively, on all multilayer films, be printed with alignment films 6, described alignment films is handled through rubbing, and make frictional direction antiparallel on the relative glass substrate to folded, the chock insulator matter that the control thickness of liquid crystal layer is arranged between each glass substrate, be marked with the bigger pure nematic liquid crystal of refractive index anisotropy difference, two liquid crystal layers are antiparallel orientations respectively and arrange, and both orientations are perpendicular, and the periphery of glass substrate has hermetically-sealed construction.
Claims (2)
1, a kind of polarization insensitivity liquid crystal photon crystal filter, it comprises three sheet glass substrates, in the middle of glass substrate is positioned in a slice, two outer glass substrates are positioned at the both sides of glass substrate, it is characterized in that: the inboard of two outer glass substrates, the both sides of a slice glass substrate have been coated with the ITO electrode film, on all ITO electrode films, alternately be coated with the multilayer film of silicon dioxide and titania respectively, on all multilayer films, be printed with alignment films, described alignment films is handled through rubbing, and make frictional direction antiparallel on the relative glass substrate to folded, the chock insulator matter that the control thickness of liquid crystal layer is arranged between each glass substrate, be marked with the bigger pure nematic liquid crystal of refractive index anisotropy difference, two liquid crystal layers are antiparallel orientations respectively and arrange, and both orientations are perpendicular, and the periphery of glass substrate has hermetically-sealed construction.
2, a kind of method for making of polarization insensitivity liquid crystal photon crystal filter as claimed in claim 1 is characterized in that:
Flatness is better than three transparent glass substrates of 1/10 wavelength on the selective transmission beam area, and the inboard of glass substrate both sides and two outer glass substrates in a slice is coated with the ITO electrode film therein;
In the ITO electrode film side of three sheet glass substrates, alternately be coated with the silicon dioxide and the titanium dioxide film formation multilayer film of the identical number of plies respectively by the optical thickness of 1550 nanometers;
On the multilayer film of three sheet glass substrates, print polyimide respectively) alignment films, after heat-treating by liquid crystal device technology, on rubbing machine, make the rubbing alignment films;
The chock insulator matter of 500 nanometers is sprayed in the inboard of glass substrate outside, and three sheet glass substrates are involutory by the alignment films side, concora crush three sheet glass substrates, and use envelope frame adhesive curing Cheng Ping;
Injection refractive index anisotropy value is 0.1～0.3 pure nematic liquid crystal in screen, seals, and finishes the making of polarization insensitivity liquid crystal photon crystal filter.
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| CN2008101371342A CN101382684B (en) | 2008-09-19 | 2008-09-19 | Polarization insensitivity liquid crystal photon crystal filter and making method thereof |
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| CN2008101371342A CN101382684B (en) | 2008-09-19 | 2008-09-19 | Polarization insensitivity liquid crystal photon crystal filter and making method thereof |
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| CN101382684A true CN101382684A (en) | 2009-03-11 |
| CN101382684B CN101382684B (en) | 2010-06-23 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147535A (en) * | 2011-02-25 | 2011-08-10 | 上海大学 | Polarization independent tunable optical filter based on quasi-phase matching crystal |
| CN102610994A (en) * | 2012-03-23 | 2012-07-25 | 哈尔滨工程大学 | Emitting tunable liquid crystal dye laser |
| CN103746284A (en) * | 2014-01-21 | 2014-04-23 | 东南大学 | Temperature control-based polarization-adjustable liquid crystal random laser and manufacturing method |
| CN110927856A (en) * | 2019-12-12 | 2020-03-27 | 华南师范大学 | Liquid crystal optical vortex demultiplexer and manufacturing method thereof |
| CN111221158A (en) * | 2020-02-10 | 2020-06-02 | 浙江大学 | Electrically tunable optical filter insensitive to polarization state of incident light |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2001131068A (en) * | 2001-11-19 | 2003-08-20 | ООО "Оптива-Технологи " | Controlled electro-optical device, method for its manufacture and electro-optical anisotropic film crystal |
-
2008
- 2008-09-19 CN CN2008101371342A patent/CN101382684B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147535A (en) * | 2011-02-25 | 2011-08-10 | 上海大学 | Polarization independent tunable optical filter based on quasi-phase matching crystal |
| CN102147535B (en) * | 2011-02-25 | 2013-01-09 | 上海大学 | Polarization independent tunable optical filter based on quasi-phase matching crystal |
| CN102610994A (en) * | 2012-03-23 | 2012-07-25 | 哈尔滨工程大学 | Emitting tunable liquid crystal dye laser |
| CN103746284A (en) * | 2014-01-21 | 2014-04-23 | 东南大学 | Temperature control-based polarization-adjustable liquid crystal random laser and manufacturing method |
| CN110927856A (en) * | 2019-12-12 | 2020-03-27 | 华南师范大学 | Liquid crystal optical vortex demultiplexer and manufacturing method thereof |
| CN110927856B (en) * | 2019-12-12 | 2023-10-20 | 华南师范大学 | Liquid crystal optical vortex demultiplexer and manufacturing method thereof |
| CN111221158A (en) * | 2020-02-10 | 2020-06-02 | 浙江大学 | Electrically tunable optical filter insensitive to polarization state of incident light |
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| CN101382684B (en) | 2010-06-23 |
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