CN103311784B - A kind of PDLC optical fiber and optical fiber random laser device thereof mixing dyestuff and metal nanoparticle - Google Patents
A kind of PDLC optical fiber and optical fiber random laser device thereof mixing dyestuff and metal nanoparticle Download PDFInfo
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- CN103311784B CN103311784B CN201310238920.2A CN201310238920A CN103311784B CN 103311784 B CN103311784 B CN 103311784B CN 201310238920 A CN201310238920 A CN 201310238920A CN 103311784 B CN103311784 B CN 103311784B
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Abstract
The invention discloses a kind of PDLC PDLC optical fiber mixing dyestuff and metal nanoparticle, it comprises: hollow optic fibre, the PDLC polymer mixing dyestuff and metal nanoparticle of solidification in hollow optic fibre, hollow optic fibre outer surface is coated with tin indium oxide ITO conductive layer vertically,? described hollow optic fibre skin adopts vacuum magnetic-control sputtering method to form the ITO conductive layer wide with optical fiber internal diameter; PDLC PDLC and the ethanolic solution of laser dye and metal nanoparticle are made homogeneous phase solution with certain mass ratio, suck described hollow optic fibre with pore effect, fill full described hollow optic fibre internal diameter through illumination curing and make refractive index polymer be greater than optical fibre refractivity; Connect generating positive and negative voltage by ITO conductive layer and form electric field change liquid crystal molecule axially, control Random Laser and export.The present invention can in optical communication, sensing, biomedicine, and the aspects such as tunable narrow-band coherent source obtain application.
Description
Technical field
The present invention relates to laser technology field, particularly relate to regulatable PDLC optical fiber and the optical fiber random laser device thereof of mixing dyestuff and metal nanoparticle.
Background technology
In recent years, Random Laser has become the popular research field of international laser educational circles.Random Laser radiation source self-activation Disordered Media, provides bulk of optical feedback by radiant light Multiple Scattering in media as well, thus obtains larger gain, without the need to extra resonance chamber.The physical mechanism of Random Laser due to uniqueness and the potential application at photoelectron and biomedical aspect and attracted increasing concern.Many active and passive materials can be used to produce Random Laser, such as: ZnO powder, and polymer, dye-doped liquid crystal, dye doped polymer dispersed LCD.Recent years, research finds that metal Nano structure body greatly can strengthen semiconductor quantum well, rare earth, the spontaneous emission rate of dyestuff, and this is because the mutual resonance between radiation center and metal surface plasma affected.Utilize these features, it is the noncoherent radiation produced by metal nanoparticle that some researchers report accidental laser.They observed the enhancing of narrowing of radiation spectrum and radiation intensity.This is the characteristic feature of incoherent accidental laser.
PDLC (PDLC) is by low molecular weight liquid crystal (liquidcrystal, be abbreviated as LC) mix mutually with prepolymer, under certain condition through polymerization reaction, formation micron order or nano level liquid crystal droplet are evenly dispersed in macromolecule network, the dielectric anisotropy of recycling liquid crystal molecule obtains has the material of electro-optic response characteristic, and it to operate mainly between scattering states and clear state and has certain gray scale.Polymer dispersed liquid crystal film is membrane material liquid crystal and polymer being combined a kind of excellent combination property obtained.Liquid crystal molecule imparts the significant electro-optical characteristic of polymer dispersed liquid crystal film, makes it receive and pays close attention to widely, and have broad application prospects.PDLC (PDLC) material is at adjustable window, and the field such as flat panel display and tunable Bragg grating is widely studied and applies.The method of general formation PDLC structure is the homogeneous mixture comprising reactive single aggressiveness and liquid crystal (LC) molecule with light initiation polymerization.These prepolymers are generally solvent-free, low viscosity.The size of LC drop depends on the concentration of LC and the intensity of curing radiation light.The refractive index n of usual polymer
pbe modulated to the ordinary index of refraction n close to liquid crystal
0.During without on-load voltage, liquid crystal molecule forms the drop of random distribution, and namely form refringence at liquid crystal molecule and polymeric contact surface, this causes the light scattering in PDLCs.Once add voltage, the axis of liquid crystal molecule will be arranged along the direction of electric field, and the scattering that liquid crystal molecule and polymer are formed due to refringence will disappear.
But metal nanoparticle is seldom concerned as the scattering particles in dye-doped liquid crystal or PDLC accidental laser.It is that these materials can strengthen multiple scattering and the gain of light by the experiment of three kinds of different materials (PDLC, metallic and dyestuff) that few people do gain random medium.And this gain media is not also applied in hollow optic fibre.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes a kind of PDLC PDLC optical fiber mixing dyestuff and metal nanoparticle, it comprises: hollow optic fibre, the PDLC polymer mixing dyestuff and metal nanoparticle of solidification in hollow optic fibre, hollow optic fibre outer surface is coated with tin indium oxide ITO conductive layer vertically, it is characterized in that:
Described hollow optic fibre skin adopts vacuum magnetic-control sputtering method to form the ITO conductive layer wide with optical fiber internal diameter; PDLC PDLC and the ethanolic solution of laser dye and metal nanoparticle are made homogeneous phase solution with certain mass ratio, suck described hollow optic fibre with pore effect, fill full described hollow optic fibre internal diameter through illumination curing and make refractive index polymer be greater than optical fibre refractivity; Connect generating positive and negative voltage by ITO conductive layer and form electric field change liquid crystal molecule axially, control Random Laser and export.
Wherein, described hollow optic fibre internal diameter is commercially available 8 μm to 1000 μm hollow optic fibres.
Wherein, ultrasonic or with concentrated acid corrosion fiber outer layer protection resin with acetone, optical fiber is embedded in high-accuracy glass template and adopts vacuum magnetic-control sputtering method to form ITO conductive layer, conductive layer and optical fiber internal diameter wide.
Wherein, the PDLC PDLC solution mixing dyestuff and metallic for solidifying in hollow optic fibre is by trimethylolpropane triacrylate monomer; NVP; Rose-red; N-phenylglycine; Sad; Liquid crystal; Laser dye; Metal nanoparticle ethanolic solution with certain mass mark than Hybrid Heating shading stir 2 little time, make to mix, the homogeneous phase solution formed, in homogeneous phase solution, shared by each component, mass fraction scope is: trimethylolpropane triacrylate 40.00wt% to 50.00wt%; NVP 5.00wt% to 10.00wt%; Rose-red 0.10wt% to 1.00wt%; N-phenylglycine 5.00wt% to 10.00wt%; Sad 5.00wt% to 10.00wt%; Liquid crystal 30.00wt% to 40.00wt%; Laser dye 1.00wt% to 2.00wt%; Metal nanoparticle ethanolic solution 1.00wt% to 3.00wt%.
Wherein, the metal nanoparticle selected can have surface plasmon resonance Fluorescence Increasing to the laser dye selected.
Wherein, described polymer homogeneous phase solution sucks hollow optic fibre by capillary effect, carries out illumination curing afterwards by ultraviolet curing lamp or Nd:YAG laser.
Wherein, in described hollow optic fibre, cure polymer refractive index is greater than optical fibre refractivity.
The invention allows for a kind of optical fiber random laser device, it comprises: mix the PDLC PDLC optical fiber of dyestuff and metal nanoparticle, AC power and pump light source as mentioned above and expand convergence light path, it is characterized in that: pump light converges light path formation bar shaped light beam through expanding, vertical irradiation along fiber axis to ITO conductive layer area, form Random Laser outgoing; Add alternating voltage by ITO conductive layer and between ITO conductive layer, form electric field change liquid crystal molecule axially, control Random Laser and export.
The PDLC optical fiber random laser device using regulation and control of the present invention to mix dyestuff and metal nanoparticle can ensure that Random Laser orientation exports; Without working fluid in hollow optic fibre, be cure polymer, without precipitation, Stability Analysis of Structures; Random Laser threshold value will significantly reduce compared to other optical fiber random laser devices, and outgoing intensity significantly strengthens; By electric field controls Random Laser outgoing intensity, break-make.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram consistent with the embodiment of the present invention;
Fig. 2 is the PDLC optical fiber structure schematic diagram of mixing dyestuff and metal nanoparticle consistent with the embodiment of the present invention, wherein, 1 be Nd:YAG laser, 2 be GRENLOND mirror group, 3 be collimator and extender set of lenses, 4 for speculum, 5 be cylindrical lens, 6 for the PDLC heart optical fiber, 7 mixing dyestuff and metal nanoparticle be AC power, 8 for Random Laser output, 9 be ITO conductive layer, 10 for the PDLC polymer, 11 mixing dyestuff and metal nanoparticle be hollow optic fibre.
Specific implementation method
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Operation principle of the present invention is: mix the PDLC polymer of dyestuff and metal nanoparticle in hollow optic fibre internal diameter solidification process, make the liquid crystal molecule of micron or nano-scale, dye molecule, metal nanoparticle is uniform curing in the network structure of polymer formation, forms rock-steady structure.With cylindrical lens, pump light being pooled bar shaped laser spot is vertically irradiated on optical fiber through ito film, when not making alive, the director random distribution of liquid crystal, polymer does not mate with liquid crystal refraction index, pump light is by liquid crystal molecule scattering, there is multiple scattering, form coherent feedback, simultaneously when surfaces of metal nanoparticles plasma resonance wavelength and exciting light match, metal nanoparticle local surface plasma resonance field will effectively strengthen the radiation efficiency of dye molecule near nano particle, stimulated radiation occurs when gain is greater than loss and amplifies.The refractive index of mixing the PDLC polymer of dyestuff and metal nanoparticle is greater than the refractive index of hollow optic fibre, forms two-dimentional local, utilizes total reflection to make outgoing Random Laser local in optical fiber, form directed output; When making alive, by control voltage size, overcome the anchoring energy of polymer network to liquid crystal molecule, make the unification of liquid crystal molecule director along direction of an electric field, what liquid crystal particle refractive index and refractive index polymer acquired a certain degree mates, scattering power changes, and Random Laser outgoing intensity, break-make changes thereupon.
Mix the PDLC optical fiber preparation process of dyestuff and metal nanoparticle, comprise following steps:
(1) the commercially available internal diameter size of hollow optic fibre (8 ~ 1000um) is selected; hollow optic fibre is processed; internal diameter is less than to the hollow optic fibre acetone ultrasonic 5 minutes removing optical fiber surface protection coated with resins of 100um, hollow optic fibre strong acid internal diameter being greater than to 100um corrodes, and cleans and dries up.The optical fiber processed is embedded prefabricated high-accuracy glass template, only exposes a part for optical fiber upper surface and lower surface, utilize vacuum magnetic control film coating sputtering technology to plate the ito film wide with hollow optic fibre internal diameter vertically in optical fiber upper and lower surface.
(2) by monomer (trimethylolpropane triacrylate); Cross-linking monomer (NVP); Light trigger (rose-red); Coinitiator (N-phenylglycine); Surfactant (sad); Liquid crystal; Laser dye; Metal nanoparticle ethanolic solution with certain mass mark than Hybrid Heating shading stir 2 little time, make to mix, the homogeneous phase solution of formation.In solution, shared by each component, mass fraction scope is: trimethylolpropane triacrylate 40.00wt% to 50.00wt%; NVP 5.00wt% to 10.00wt%; Rose-red mass fraction 0.10wt% to 1.00wt%; N-phenylglycine matter 5.00wt% to 10.00wt%; Sad 5.00wt% to 10.00wt%; Liquid crystal 30.00wt% to 40.00wt%; Laser dye 1.00wt% to 2.00wt%; Metal nanoparticle ethanolic solution 1.00wt% to 3.00wt%.Utilize capillary effect that polymer homogeneous phase solution is sucked hollow optic fibre, cause phase separation method with polymerization afterwards and make polymer cure, be specially with Nd:YAG laser with 532nm wavelength,
uniform intensity irradiates optical fiber 5min ~ 1min and is cured or is cured with ultraviolet curing lamp, changes intensity of illumination and light application time control liquid crystal molecule size, and polymer threshold voltage.Meanwhile, metal nanoparticle is selected can to have surface plasmon resonance Fluorescence Increasing to the laser dye selected.After polymer cure, cure polymer refractive index is greater than optical fibre refractivity.
As shown in Figure 1, the regulatable PDLC optical fiber random laser device mixing dyestuff and metal nanoparticle, comprises following steps:
(1) Nd:YAG shoot laser 1 through GRENLOND mirror group 2, collimator and extender set of lenses 3, speculum 4, cylindrical lens 5 focus on bar shaped pump light vertical irradiation through ITO conductive layer 9.
(2) bar shaped pump light irradiates the PDLC polymer 10 mixing dyestuff and metal nanoparticle in hollow optic fibre 11, forms Random Laser outgoing 8.
(3) AC power 7 connects ITO conductive layer 9, and AC power electrode is the arc-shaped electrode of fitting with optical fiber ITO layer, forms electric field controls liquid crystal molecule axially between ITO layer, regulation and control Random Laser outgoing 8.
The present invention realizes the Random Laser outgoing of mixing the PDLC optical fiber random laser device of dyestuff and metal nanoparticle, and exports the electric light regulation and control of Random Laser.
The invention has the advantages that, first the PDLC polymer mixing dyestuff and metal nanoparticle is combined with hollow optic fibre; Compared with liquid crystal cell Random Laser, optical fiber structure forms two-dimentional local to emergent light, and Random Laser orientation exports; Compared with general hollow optic fibre Random Laser, without working fluid in hollow optic fibre, be cure polymer, without precipitation, Stability Analysis of Structures, the local surface resonance of metal nanoparticle contributes to reducing Random Laser threshold value, strengthens outgoing intensity; The regulation and control to outgoing Random Laser are carried out by voltage.Can in optical communication, sensing, biomedicine, the aspects such as tunable narrow-band coherent source obtain application.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications that it is expected to, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. mix the PDLC PDLC optical fiber of dyestuff and metal nanoparticle for one kind, it comprises: hollow optic fibre, the PDLC polymer mixing dyestuff and metal nanoparticle of solidification in hollow optic fibre, hollow optic fibre outer surface is coated with tin indium oxide ITO conductive layer vertically, it is characterized in that:
Described hollow optic fibre skin adopts vacuum magnetic-control sputtering method to form the ITO conductive layer wide with optical fiber internal diameter; PDLC PDLC and the ethanolic solution of laser dye and metal nanoparticle are made homogeneous phase solution with certain mass ratio, suck described hollow optic fibre with pore effect, fill full described hollow optic fibre internal diameter through illumination curing and make refractive index polymer be greater than optical fibre refractivity; Connect generating positive and negative voltage by ITO conductive layer and form electric field change liquid crystal molecule axially, control Random Laser and export.
2. mix the PDLC PDLC optical fiber of dyestuff and metal nanoparticle as claimed in claim 1, it is characterized in that, described hollow optic fibre internal diameter is commercially available 8 μm to 1000 μm hollow optic fibres.
3. mix the PDLC PDLC optical fiber of dyestuff and metal nanoparticle as claimed in claim 1 or 2; it is characterized in that; with acetone ultrasonic or with concentrated acid corrosion fiber outer layer protection resin; optical fiber is embedded in high-accuracy glass template and adopts vacuum magnetic-control sputtering method to form ITO conductive layer, conductive layer and optical fiber internal diameter wide.
4. mix the PDLC PDLC optical fiber of dyestuff and metal nanoparticle as claimed in claim 1, it is characterized in that, be by trimethylolpropane triacrylate monomer for the PDLC PDLC solution mixing dyestuff and metallic solidified in hollow optic fibre; NVP; Rose-red; N-phenylglycine; Sad; Liquid crystal; Laser dye; Metal nanoparticle ethanolic solution with certain mass mark than Hybrid Heating shading stir 2 little time, make to mix, the homogeneous phase solution formed, in homogeneous phase solution, shared by each component, mass fraction scope is: trimethylolpropane triacrylate 40.00wt% to 50.00wt%; NVP 5.00wt% to 10.00wt%; Rose-red 0.10wt% to 1.00wt%; N-phenylglycine 5.00wt% to 10.00wt%; Sad 5.00wt% to 10.00wt%; Liquid crystal 30.00wt% to 40.00wt%; Laser dye 1.00wt% to 2.00wt%; Metal nanoparticle ethanolic solution 1.00wt% to 3.00wt%.
5. the PDLC PDLC optical fiber mixing dyestuff and metal nanoparticle as described in claim 1 or 4, is characterized in that the metal nanoparticle selected can have surface plasmon resonance Fluorescence Increasing to the laser dye selected.
6. the PDLC PDLC optical fiber mixing dyestuff and metal nanoparticle as described in claim 1 or 4, it is characterized in that, described polymer homogeneous phase solution sucks hollow optic fibre by capillary effect, carries out illumination curing afterwards by ultraviolet curing lamp or Nd:YAG laser.
7. mix the PDLC PDLC optical fiber of dyestuff and metal nanoparticle as claimed in claim 1, it is characterized in that, in described hollow optic fibre, cure polymer refractive index is greater than optical fibre refractivity.
8. an optical fiber random laser device, it comprises: mix the PDLC PDLC optical fiber of dyestuff and metal nanoparticle, AC power and pump light source as claimed in claim 1 and expand convergence light path, it is characterized in that: pump light converges light path formation bar shaped light beam through expanding, vertical irradiation along fiber axis to tin indium oxide ITO conductive layer area, form Random Laser outgoing; Add alternating voltage by ITO conductive layer and between ITO conductive layer, form electric field change liquid crystal molecule axially, control Random Laser and export.
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