CN107887787B - A kind of flexible quanta accidental laser based on PDMS polymer - Google Patents
A kind of flexible quanta accidental laser based on PDMS polymer Download PDFInfo
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- CN107887787B CN107887787B CN201711379542.4A CN201711379542A CN107887787B CN 107887787 B CN107887787 B CN 107887787B CN 201711379542 A CN201711379542 A CN 201711379542A CN 107887787 B CN107887787 B CN 107887787B
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- pdms
- permeable formation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
Abstract
The present invention provides a kind of flexible quanta accidental lasers based on PDMS polymer, including permeable formation sandwiched between two layers of PDMS film layer and two layers of PDMS film layer, crosslinker concentration in PDMS film layer is greater than 4%, crosslinker concentration in permeable formation is 2%-4%, permeable formation is internal stress PDMS film layer unevenly distributed, permeable formation is equipped at least one set of several linear grooves dissipated from central point to all directions or at least one set of several annular grooves gradually spread by central point, groove are permeated for quantum dot.Quantum dot of the present invention serves as the effect of gain media during Random Laser is emitted, it is unevenly distributed using the internal stress of permeable formation, inconsistent by photoelastic effect formation localization refractive index, enhancing multiple scattering effect has achieved the purpose that reduce outgoing Random Laser threshold value.Quantum dot is filled in the lower permeable formation of concentration in the present invention, compared to the quantum dot film of glass baseplate surface, has the characteristics that operate for a long time.Simultaneously because PDMS is flexible material, have the characteristics that flexible, the preparation of flexible accidental laser may be implemented.
Description
Technical field
The present invention relates to a kind of lasers, and in particular to a kind of accidental laser.
Background technique
In recent years, Random Laser has become the popular research field of international laser educational circles.Random Laser is in mechanism of production
And in the characteristics of luminescence with conventional laser there are many significant differences, Random Laser radiation source self-activation Disordered Media passes through
The Multiple Scattering of radiant light in the medium provides bulk of optical feedback, to obtain biggish gain, is not necessarily to extra resonance chamber.Quantum dot
Accidental laser be by quanta point material spin coating on the glass substrate, utilize glass substrate rough surface provide scattering, outgoing
Random Laser has the characteristics that at low cost, preparation process is simple.
Dimethyl silicone polymer (PDMS) is a kind of high molecular polymer of elasticity, and due to having, the processing is simple, optical lens
Bright characteristic is widely used in making accidental laser.Accidental laser based on PDMS mainly adulterates nanoparticle
Into PDMS, then mixture is spun in substrate, substrate can be glass, silica gel etc..Since PDMS itself has well
Young's modulus, polarization, the peak wavelength etc. of Random Laser can be changed by the method for stretching, therefore this flexible random swash
Light device shows in flexible flat, in terms of have potential application value.
Benefit from quantum confined effect, Colloidal Quantum Dots (CQD) have the advantages that as laser material it is some irreplaceable,
Such as wide excitation spectrum, launch wavelength is tunable, high quantum production rate, good excitation purity and temperature-insensitive laser
Energy.In addition, quantum dot be substantially it is inorganic, more stable compared to organic-based gain material, therefore quantum dot is in Random Laser system
There are very big potentiality in system.In the prior art, document is " by CdSe/ZnS amount in OPTICS EXPRESS 2011,4,2997 "
Sub- spot deposition forms quantum dot film in the groove with rough inner-surface, and groove dimensions are 80 μm * 40 μm, using in groove
Rough surface provide scattering, observe Random Laser be emitted.But this Random Laser is due to lacking more feedback mechanisms,
So that the very high (25mJ/cm of threshold value of outgoing2), increase the loss of pump light.
Summary of the invention
Goal of the invention: in view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of based on PDMS polymer
Flexible quanta accidental laser is produced using photoelastic effect when external pumping illumination is mapped to the groove that internal stress is unevenly distributed
Raw optical anisotropy each of causes in groove localization refractive index inconsistent, and the difference of this refractive index enhances light
Scattering process is learned, the threshold value of Random Laser outgoing is reduced.Meanwhile flexible quanta accidental laser preparation process is simple, tool
There is the advantages of at low cost, to operate for a long time.
Technical solution: the present invention provides a kind of flexible quanta accidental lasers based on PDMS polymer, including two
Sandwiched permeable formation between layer PDMS film layer and two layers of PDMS film layer, the crosslinker concentration in the PDMS film layer are big
Crosslinker concentration in 4%, the permeable formation is 2%-4%, and the permeable formation is that internal stress PDMS unevenly distributed is thin
Film layer, the permeable formation be equipped at least one set of several linear grooves dissipate from central point to all directions or at least one set by
Several annular grooves that central point is gradually spread, the groove are permeated for quantum dot.
Further, the width of the groove is 3-5 μm, and depth is 1-2 μm.
Further, the angle between two neighboring linear grooves is 8 ° -10 °.
Further, the diameter of the annular groove is 10-20 μm, and the distance between two neighboring annular groove is 1-2 μm.
Further, the PDMS film layer with a thickness of 1.5mm, the permeable formation with a thickness of 30 μm -60 μm.
Further, the refractive index of the PDMS film layer is 1.4, contains the refraction at quantum dot in the permeable formation groove
Rate is 2.1.
Further, the quantum dot is CdSe/ZnS or CdSe/CdS.
Inventive principle: in laser structure of the present invention, the crosslinker concentration in PDMS film layer is greater than 4%, by solidification
Rigid boundary is formed later, and the crosslinker concentration in permeable formation is 2%-4%, and permeable formation is soft due to the lower formation viscoplasticity of concentration
Region.Permeable formation is equipped at least one set of several linear grooves dissipated from central point to all directions or at least one set by center
Several annular grooves that point is gradually spread, the size of groove are micron dimension.By the way that quantum dot to be filled into permeable formation, measure
Son point, which is randomly distributed in groove, forms unordered gain regions.It is linear recessed when external pumping illumination is mapped on PDMS film layer
The scattering process that slot or annular groove provide is conducive to light amplification, and the amplification of light is being measured from the increased radiant light of multiple scattering
Son puts the light path and residence time in unordered gain regions, so as to form Random Laser.In addition, permeable formation is due to internal stress point
Cloth is uneven, generates photoelastic effect under pump light irradiation, so as to cause optical anisotropy in permeable formation, causes office in groove
Domain refractive index is inconsistent.Localization refractive index difference caused by this optical anisotropy can enhance Random Laser outgoing process
Needed for multiple scattering effect, thus reduce outgoing Random Laser threshold value.In addition, what the PDMS film of various concentration was formed
Waveguiding structure also provides bulk of optical feedback to the restriction effect that light generates for the formation of Random Laser, under laser pumping,
It is emitted one direction, the Random Laser of Low threshold.
The utility model has the advantages that quantum dot of the present invention serves as the effect of gain media during Random Laser is emitted, infiltration is utilized
The internal stress of layer is unevenly distributed, inconsistent by photoelastic effect formation localization refractive index, and enhancing multiple scattering effect reaches
Reduce the purpose of outgoing Random Laser threshold value.Quantum dot is filled in the lower permeable formation of concentration in the present invention, compares glass
The quantum dot film of substrate surface has the characteristics that operate for a long time.Simultaneously because PDMS is flexible material, have flexible
Flexible accidental laser preparation may be implemented in feature.
The present invention is by means of PDMS elastomeric polymer, the groove structure being unevenly distributed using internal stress, realize one direction,
The quantum dot Random Laser of Low threshold is emitted, and can be used as light source in flexible panel display system and other photonics makes
With；The quantum dot accidental laser is due to its flexibility characteristics simultaneously, under pressure or stretching action, thus it is possible to vary Random Laser
Relevant circuit, the mode of adjustment outgoing Random Laser, can be applied to sensing aspect.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2~3 are the structural schematic diagram of two types permeable formation.
Specific embodiment
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the implementation
Example.
As shown in Figures 1 to 3, a kind of to be based on PDMS polymer flexibility quantum dot accidental laser, including 1 He of external pump light
Structure print 2；Structure print includes infiltration sandwiched between the first, second PDMS film layer 4 and the first, second PDMS film layer
Permeable layers 5.Crosslinker concentration in first, second PDMS film layer 4 is 5%, and the crosslinker concentration in permeable formation 5 is 2.2%.It seeps
Permeable layers 5 are internal stress PDMS film layer unevenly distributed, are permeated for quantum dot, and quanta point material is emitted process in Random Laser
In serve as the effect of gain media.Permeable formation 5 is equipped with several linear grooves 7 dissipated from central point to all directions or in
Several annular grooves 8 of heart point diffusion, these grooves are since internal stress is unevenly distributed, so that localization refractive index is inconsistent,
Multiple scattering effect needed for enhancing Random Laser outgoing.The wavelength that Nd:YAG laser is exported is the ultraviolet light of 355nm, warp
External pumping optical path is crossed, ultimately forming the bar shaped pump light that specification is 0.5mm*8mm is external pump light 1, when external pumping
Light 1 is irradiated to structure print 2, and structure print 2 is emitted unidirectional Random Laser 3.
The preparation method of above-mentioned flexible quanta accidental laser:
PDMS prepolymer A and crosslinking agent B Sylgard 184 is mixed with the concentration greater than 4%, it is to be mixed uniform
Afterwards, it is added drop-wise in cuvette, stands a night, remove bubble.
The mixture at a night will be stood, be placed in 65 DEG C of baking oven and heat 3h, has made mixture film-forming, with a thickness of
The first, second PDMS film is made by cutting in 1.5mm, refractive index 1.4.
PDMS prepolymer A and crosslinking agent B are mixed with the concentration of 2%-4%, it is to be mixed uniformly after, be added drop-wise to first
On PDMS film, a night is stood, removes bubble.
Second PDMS film is covered with, is placed in 65 DEG C of baking oven and heats 2h, permeable formation 5 is completed and solidifies.The thickness of permeable formation 5
Degree is 45 μm.
The high pressure draught 6 of 10kpa is passed through permeable formation 5 from 5 side of permeable formation, can with single simultaneously be passed through it is multiple either
It is repeatedly passed through, so that permeable formation 5 is covered with groove.Due to a load excessive, is formed in permeable formation 5 from central point to all directions and dissipated
Several linear grooves 7, as shown in Fig. 2, the width 3-5um of each groove, depth 1-2um, between two neighboring linear grooves
8 ° -10 ° of angle.Quantum dot (CdSe/ZnS) is filled into permeable formation 5, amount in 5 groove of permeable formation through capillary action
Refractive index at sub- point is 2.1, and structure print 2 of the invention is made.
Structure print cooperates external pump light, that is, is prepared into the flexible quanta accidental laser based on PDMS polymer.
Preparation the flexible quanta accidental laser based on PDMS polymer in, permeable formation formed from central point to
Several linear grooves of all directions diverging, the internal stress of each point is different on groove, under the effect of external pump light, generates light
Buoyancy effect.So that the groove in permeable formation generates optical anisotropy, cause localization refractive index inconsistent.By Nd:
The ultraviolet light that the wavelength of YAG laser output is 355nm, by external pumping optical path, ultimately forming specification is 0.5mm*8mm's
Bar shaped pump light, when external pump light 1 is irradiated to structure print 2, structure print 2 is emitted unidirectional Random Laser 3.
Or by high pressure draught 6 pass through the second PDMS film layer 4 be passed through permeable formation 5, can with single simultaneously be passed through it is multiple or
Person is repeatedly to be passed through, so that permeable formation 5 is covered with groove.Due to a load excessive, if spread in the formation of permeable formation 5 by central point
Dry annular groove 8, as shown in figure 3, the diameter of annular groove is 10-20 μm, the distance between two neighboring annulus is 1-2 μ
m.Quantum dot (CdSe/ZnS) is filled into permeable formation 5 through capillary action, structure print 2 of the invention is made.
Claims (7)
1. a kind of flexible quanta accidental laser based on PDMS polymer, it is characterised in that: including two layers of PDMS film layer
And sandwiched permeable formation between two layers of PDMS film layer, the crosslinker concentration in the PDMS film layer are greater than 4%, the infiltration
Crosslinker concentration in permeable layers is 2%-4%, and the permeable formation is internal stress PDMS film layer unevenly distributed, the infiltration
Layer is equipped at least one set of several linear grooves dissipated from central point to all directions or at least one set is gradually expanded by central point
Several scattered annular grooves, the groove are permeated for quantum dot.
2. the flexible quanta accidental laser according to claim 1 based on PDMS polymer, it is characterised in that: described
The width of groove is 3-5 μm, and depth is 1-2 μm.
3. the flexible quanta accidental laser according to claim 1 or 2 based on PDMS polymer, it is characterised in that:
Angle between two neighboring linear grooves is 8o-10o.
4. the flexible quanta accidental laser according to claim 2 or 3 based on PDMS polymer, it is characterised in that:
The diameter of the annular groove is 10-20 μm, and the distance between two neighboring annular groove is 1-2 μm.
5. the flexible quanta accidental laser according to claim 1 based on PDMS polymer, it is characterised in that: described
The thickness of two layers of PDMS film layer is respectively 1.5mm, the permeable formation with a thickness of 30 μm -60 μm.
6. the flexible quanta accidental laser according to claim 2 based on PDMS polymer, it is characterised in that: described
The refractive index of two layers of PDMS film layer is respectively 1.4, in the permeable formation groove containing the refractive index at quantum dot be 2.1.
7. the flexible quanta accidental laser according to claim 1 based on PDMS polymer, it is characterised in that: described
Quantum dot is CdSe/ZnS or CdSe/CdS.
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| CN201711379542.4A CN107887787B (en) | 2017-12-19 | 2017-12-19 | A kind of flexible quanta accidental laser based on PDMS polymer |
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| CN201711379542.4A CN107887787B (en) | 2017-12-19 | 2017-12-19 | A kind of flexible quanta accidental laser based on PDMS polymer |
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| CN107887787B true CN107887787B (en) | 2019-07-12 |
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