CN105116533A - Tunable capturing and screening method of linear polarization planar optical waves for liquid crystal material particle above substrate - Google Patents
Tunable capturing and screening method of linear polarization planar optical waves for liquid crystal material particle above substrate Download PDFInfo
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- CN105116533A CN105116533A CN201510428964.0A CN201510428964A CN105116533A CN 105116533 A CN105116533 A CN 105116533A CN 201510428964 A CN201510428964 A CN 201510428964A CN 105116533 A CN105116533 A CN 105116533A
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Abstract
The invention relates to a tunable capturing and screening method of linear polarization planar optical waves for a liquid crystal material particle above a substrate. The technical scheme of the tunable capturing and screening method comprises the steps of arranging the liquid crystal material particle above a substrate plate, damaging symmetrical distribution of Poynting vectors around the liquid crystal material particle, enabling the total Poynting vector on the liquid crystal material particle not to be zero, and generating a non-gradient optical force; and then changing the direction and the size of the total Poynting vector on the liquid crystal material particle through changing the arrangement direction of a liquid crystal molecule in a liquid crystal material, that is, the direction of a liquid crystal molecular axis, so as to regulate and control the movement track of the liquid crystal material particle in an incident field, thereby carrying out tunable capturing and screening on nano-sized molecules attached to the surface of the liquid crystal material particle. The direction of the liquid crystal molecular axis in the liquid crystal material is changed through the modes of illumination, electrification, heating, pressurization and the like.
Description
Technical field
The present invention relates to the tunable method of catching and screening of a kind of plane of linear polarization light wave to the liquid crystal material particulate of types of flexure, can be applicable to the fields such as biology, medical science and nanometer manipulation.
Background technology
It is the study hotspot of optical field to the optical acquisition of small items and screening always.Optical gradient forces plays important role in various optical acquisition technology, such as, by light tweezer and optics binding etc. that optical gradient forces realizes.But it is complicated, untunable and defy capture and screen the shortcomings such as nanometer-size molecular that optical gradient forces has generation equipment.2008, the optical gradient forces that Ward, T.J. etc. propose to be produced by circularly polarized light can be caught and be separated the chiral molecules with nano-scale.But circularly polarized incident light still needs to use complicated equipment to produce, and is unfavorable for the practical application of system; And it is caught and must have chiral structure with the nano molecular be separated, because which limit the scope of its effective object.So the present invention proposes, being positioned at the covering of the liquid crystal material microparticle surfaces above substrate flat board nanometer-size molecular, to make it produce non-gradient optical force around liquid crystal material particulate under plane of linear polarization light-wave irradiation; Then, the liquid crystal molecule direction of principal axis of liquid crystal material is utilized to change and the characteristic of change with additional light field, electric field, temperature field and pressure field, the non-gradient optical force size and Orientation that tuning liquid crystal material particulate is subject to, thus realize catching and screening the nanometer-size molecular being attached to liquid crystal material microparticle surfaces, wherein nanometer-size molecular can be achirality structure.
Summary of the invention
The object of the invention is to overcome the incident light source complexity (namely incident light must be circular polarization or elliptic polarization) utilizing gradient optics power to catch and screen to have in this classic method of nanometer-size molecular, screening object limitation (namely nanometer-size molecular must have chiral structure), the gradient optics power produced by circular polarization or elliptically polarized light is untunable, and the deficiencies such as nano-scale achiral molecule that defy capture, and it is simple to provide one to have system, easy to operate, hypersensitive, supper-fast, the method of the achirality nanometer-size molecular be positioned at above substrate flat board is caught and screened to the non-gradient optical force produced by plane of linear polarization light wave of the advantages such as active is tuning, can be used for biology, the field such as medical science and nanometer manipulation.
The present invention deal with problems adopt technical scheme as follows:
A kind of plane of linear polarization light wave is to the tunable method of catching and screening of the liquid crystal material particulate of types of flexure, liquid crystal material particulate is placed in above substrate flat board, the Poynting vector that this substrate flat board destroys around liquid crystal material particulate is symmetrical, make the total Poynting vector on liquid crystal material particulate non-vanishing, produce non-gradient optical force, by changing the liquid crystal molecule direction of principal axis of liquid crystal material, change the total Poynting vector distribution on liquid crystal material particulate, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on liquid crystal material particulate, regulate and control the movement locus of liquid crystal material particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to liquid crystal material microparticle surfaces, wherein, liquid crystal material particulate is placed in above substrate flat board, substrate flat board can be dielectric-slab or sheet metal, the length of substrate, wide, high in 10 nanometers to 10 meters, the distance of liquid crystal material particulate and substrate planar surface is l (l>0), the profile of liquid crystal material particulate can be the polyhedrons such as surface geometry body or prism, square, rectangular parallelepiped such as spheroid, right cylinder, cone, and volume is at 1 cubic nanometer to 1000 cu μ m.
Described incident light is plane of linear polarization ripple; Incident light direction is parallel to substrate flat board, and frequency range is 0.3 micron ~ 20 microns, and power bracket is 0.1mW/ μm
2~ 10mW/ μm
2.
The light source of described incident light adopts Wavelength tunable laser, semiconductor continuously or quasi-continuous lasing or light emitting diode.
Described substrate is dull and stereotyped, and backing material can be metal or medium, and wherein, metal can be Al, Ag, Au, Cu, Ni, Pt etc., and medium can be that semiconductor material is as Si, SiO
2, GaAs, InP, Al
2o
3deng or polymkeric substance.
Described surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, and liquid crystal material is nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, dish-like liquid crystal, thermotropic liquid crystal, reappearance liquid crystal, chiral liquid crystal, negative liquid crystal, end alkene class liquid crystal, miazines liquid crystal, fluoro liquid crystals, alkyne type liquid crystal, ethane's liquid crystal, cyclohexylbenzene class liquid crystal.
Described surface is with the liquid crystal material particulate of nanometer-size molecular, and nanometer-size molecular can have achirality structure or chiral structure, as antigen, and antibody, enzyme, hormone, amine, peptide class, amino acid, vitamin etc.
Described surface is with the liquid crystal material particulate of nanometer-size molecular, and liquid crystal material is realized by Material growth technique, comprises magnetron sputtering, electron beam evaporation, metal organic compound chemical gaseous phase deposition, vapor phase epitaxial growth, molecular beam epitaxy etc.
Described surface, with the liquid crystal material particulate of nanometer-size molecular, can change the liquid crystal molecule direction of principal axis of wherein liquid crystal material by modes such as illumination, energising, heating and pressurizations, and then changes birefraction and the dielectric coefficient of liquid crystal material.
Present system is made up of light source, microscope and optical force display.First substrate flat board is placed in before test bottom the sample cell that water or oil are housed, then liquid crystal material particulate surface being had nanometer-size molecular is placed in the sample cell that water or oil are housed, be placed in above substrate flat board simultaneously, plane of linear polarization wave source enters from the sidewall of sample cell, irradiating liquid crystal particles of material, the Poynting vector destroyed around liquid crystal material particulate due to substrate flat board is symmetrical, makes the total Poynting vector on liquid crystal material particulate non-vanishing, produces non-gradient optical force; Then, birefraction and the dielectric coefficient of liquid crystal material is changed by the liquid crystal molecule direction of principal axis changing liquid crystal material, change the total Poynting vector on liquid crystal material particulate, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on liquid crystal material particulate, adjust the movement locus of liquid crystal material particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to liquid crystal material microparticle surfaces.Microscope can be used for observing the surperficial movement locus produced under incident light effect with the liquid crystal material particulate of nanometer-size molecular.Described microscope can adopt common fluorescent vertically or just to put microscope.
Described system can realize catching having the tunable of nano-scale achirality structural objects and screening by simple plane of linear polarization light wave.Overcome utilize gradient optics power to catch and screen to have in this classic method of nanometer-size molecular incident light source complexity (namely incident light is necessary for circular polarization or elliptic polarization), screening object limitation (namely nanometer-size molecular must have chirality), the untunable and problems such as nanometer-size molecular that defy capture by the gradient optics power of circular polarization or elliptically polarized light generation, there is the advantages such as system is simple, easy to operate, hypersensitive, supper-fast, active is tuning, can be used for biology, the field such as medical science and nanometer manipulation.
Accompanying drawing explanation
Fig. 1 is the liquid crystal material particulate schematic diagram of surface with nanometer-size molecular.
Fig. 2 is that the non-gradient optical force produced by linearly polarized light catches the process schematic of surface with the liquid crystal material particulate of nanometer-size molecular.
Fig. 3 is that the non-gradient optical force produced by linearly polarized light catches the system testing schematic diagram of surface with the liquid crystal material particulate of nanometer-size molecular.
In figure: 1 liquid crystal material particulate, 2 nanometer-size molecular, 3 substrates are dull and stereotyped, 4 light sources, 5 microscopes, 6 optical force displays, 7 sample cells, 8 thermostats, 9CCD video camera, 10 monitors, 11 computing machines, 12 video recorders.
Embodiment
For making the content of technical scheme of the present invention more clear, describe the specific embodiment of the present invention in detail below in conjunction with technical scheme and accompanying drawing.Material growth technology wherein comprises: magnetron sputtering, electron beam evaporation, metal organic compound chemical gaseous phase deposition, vapor phase epitaxial growth, and the common technology such as molecular beam epitaxy technique.
Embodiment 1
First, liquid crystal material particulate 1 is produced, as shown in accompanying drawing 1 (a) by Material growth technique.Wherein liquid crystal material particulate geometric configuration and size can adopt finite time-domain method of difference, finite element method scheduling algorithm is determined.
Secondly, at liquid crystal material particulate 1 outside surface attachment nanometer-size molecular 2, as shown in accompanying drawing 1 (b).
Then, the liquid crystal material particulate 1 of surface attachment nanometer-size molecular 2 is placed in above substrate flat board 3, distance is l (l>0), when incident light is plane of linear polarization ripple and the liquid crystal molecule axle of liquid crystal material particulate 1 is consistent with optical axis direction, the Poynting vector be in around the liquid crystal material particulate 1 above substrate 3 is asymmetric distribution, namely the total Poynting vector on liquid crystal material particulate 1 is non-vanishing, produce the non-gradient optical force along sensing right front, incident light direction, liquid crystal material particulate 1 is moved along the right front in incident light direction, and then drive the nanometer-size molecular 2 being attached to liquid crystal material particulate 1 surface to move along the right front in incident light direction, as shown in accompanying drawing 2 (a).
Afterwards, due to the anisotropy of the specific inductive capacity of liquid crystal material, the liquid crystal molecule axle of liquid crystal material particulate 1 can be made towards other direction (namely different from optical axis direction) by modes such as illumination, energising, heating and pressurizations, total Poynting vector direction on liquid crystal material particulate 1 surface and size are changed, produce the non-gradient optical force along sensing left front, incident light direction, liquid crystal material particulate 1 is made to drive the nanometer-size molecular 2 being attached to its surface to move along the left front in incident light direction, as shown in accompanying drawing 2 (b).
Finally, by modes such as cooling, illumination, the liquid crystal molecule direction of principal axis of liquid crystal material particulate 1 is become again consistent with optical axis direction, the non-gradient optical force that now liquid crystal material particulate 1 is subject to has become again the non-gradient optical force along sensing right front, incident light direction again, liquid crystal material particulate 1 drives nanometer-size molecular 2 to move along the right front in incident light direction, as shown in accompanying drawing 2 (c).
We are by changing the liquid crystal molecule direction of principal axis of liquid crystal material like this, control the movement locus of liquid crystal material particulate 1 in incident field, finally achieve and catch the tunable of the nanometer-size molecular 2 being attached to liquid crystal material particulate 1 surface and screen.
Present system is formed primarily of light source 4, microscope 5 and optical force display 6.First substrate flat board 3 is placed in the bottom of the sample cell 7 that water or oil are housed before test, then the liquid crystal material particulate 1 of surface attachment nanometer-size molecular 2 is placed in sample cell 7, and is placed in above substrate flat board 3.Light source 4 produces plane of linear polarization ripple and enters from the sidewall of sample cell 7, horizontal irradiation liquid crystal material particulate 1, realizes arresting and handling of the liquid crystal material particulate 1 of effects on surface attachment nanometer-size molecular 2.Microscope 5 can be used for the movement locus observing the liquid crystal material particulate 1 of micro-surface attachment nanometer-size molecular 2 produce under incident light effect.The non-gradient optical force that plane of linear polarization ripple produces at the liquid crystal material particulate 1 of surface attachment nanometer-size molecular 2 is recorded by optical force display 6.Present system also comprises thermostat 8, ccd video camera 9, monitor 10, computing machine 11 and video recorder 12 etc. (shown in accompanying drawing 3) simultaneously.The liquid crystal material particulate 1 of the surface attachment nanometer-size molecular 2 under utilizing ccd video camera 9 pairs of plane of linear polarization ripples to irradiate carries out Real-Time Monitoring, and the vision signal of gained is shown at display.Video recorder 12 can be used for recording image.Sample cell 7 is connected with thermostat 8, and the liquid crystal molecule direction of principal axis in the liquid crystal material particulate 1 of surface attachment nanometer-size molecular 2 is changed with the temperature variation of sample cell 7.Computing machine 11 can store the visual field information that microscope 5 gathers.
The above is the know-why applied of the present invention and instantiation, the equivalent transformation done according to conception of the present invention, if its scheme used do not exceed that instructions and accompanying drawing contain yet spiritual time, all should within the scope of the invention, hereby illustrate.
Claims (8)
1. a plane of linear polarization light wave is to the tunable method of catching and screening of the liquid crystal material particulate of types of flexure, it is characterized in that, liquid crystal material particulate is placed in above substrate flat board, the Poynting vector that this substrate flat board destroys around liquid crystal material particulate is symmetrical, make the total Poynting vector on liquid crystal material particulate non-vanishing, produce non-gradient optical force, by changing the liquid crystal molecule direction of principal axis of liquid crystal material, change the total Poynting vector distribution on liquid crystal material particulate, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on liquid crystal material particulate, regulate and control the movement locus of liquid crystal material particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to liquid crystal material microparticle surfaces, wherein, liquid crystal material particulate is placed in above substrate flat board, substrate flat board is dielectric-slab or sheet metal, the length of substrate, wide, high in 10 nanometers to 10 meters, the distance of liquid crystal material particulate and substrate planar surface is l, l>0, the profile of liquid crystal material particulate is surface geometry body or polyhedron, and volume is at 1 cubic nanometer to 1000 cu μ m.
2. method according to claim 1, is characterized in that, incident light is plane of linear polarization ripple; Incident light direction is parallel to substrate flat board, and frequency range is 0.3 micron ~ 20 microns, and power bracket is 0.1mW/ μm
2~ 10mW/ μm
2.
3. method according to claim 1 and 2, is characterized in that, the light source of incident light adopt Wavelength tunable laser, semiconductor continuously, quasi-continuous lasing or light emitting diode.
4. method according to claim 3, is characterized in that, substrate is dull and stereotyped, and it is characterized in that, backing material can be metal or medium, and wherein, metal is Al, Ag, Au, Cu, Ni, Pt, and medium is Si, SiO
2, GaAs, InP, Al
2o
3in one or polymkeric substance.
5. method according to claim 4, it is characterized in that, surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, and liquid crystal material is nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, dish-like liquid crystal, thermotropic liquid crystal, reappearance liquid crystal, chiral liquid crystal, negative liquid crystal, end alkene class liquid crystal, miazines liquid crystal, fluoro liquid crystals, alkyne type liquid crystal, ethane's liquid crystal, cyclohexylbenzene class liquid crystal.
6. the method according to claim 1 or 2 or 4 or 5, is characterized in that, surface is with the liquid crystal material particulate of nanometer-size molecular, and rice sized molecules has achirality structure or chiral structure.
7. the method according to claim 1 or 2 or 4 or 5, it is characterized in that, surface is with the liquid crystal material particulate of nanometer-size molecular, liquid crystal material is realized by Material growth technique, comprises magnetron sputtering, electron beam evaporation, metal organic compound chemical gaseous phase deposition, vapor phase epitaxial growth, molecular beam epitaxy.
8. the method according to claim 1 or 2 or 4 or 5, it is characterized in that, surface by the liquid crystal molecule direction of principal axis of illumination, energising, heating and pressurizing altered wherein liquid crystal material, and then changes birefraction and the dielectric coefficient of liquid crystal material with the liquid crystal material particulate of nanometer-size molecular.
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Citations (3)
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| US20030008364A1 (en) * | 2001-04-27 | 2003-01-09 | Genoptix | Method and apparatus for separation of particles |
| US20140374581A1 (en) * | 2013-03-13 | 2014-12-25 | The Board Of Trustees Of The Leland Stanford Junior University | Method and structure for plasmonic optical trapping of nano-scale particles |
| CN104487821A (en) * | 2012-05-14 | 2015-04-01 | 微流控光学公司 | Methods of using near field optical forces |
-
2015
- 2015-07-21 CN CN201510428964.0A patent/CN105116533A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030008364A1 (en) * | 2001-04-27 | 2003-01-09 | Genoptix | Method and apparatus for separation of particles |
| CN104487821A (en) * | 2012-05-14 | 2015-04-01 | 微流控光学公司 | Methods of using near field optical forces |
| US20140374581A1 (en) * | 2013-03-13 | 2014-12-25 | The Board Of Trustees Of The Leland Stanford Junior University | Method and structure for plasmonic optical trapping of nano-scale particles |
Non-Patent Citations (2)
| Title |
|---|
| A.V.SEROV: "《Ponderomotive nongradient force acting on a relativistic particle crossing an inhomogeneous electromagnetic wave》", 《JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS》 * |
| ZHIPENG LI ET AL: "《Ultrasensitive Size-Selection of Plasmonic Nanoparticles by Fano Interference Optical Force》", 《ACS NANO》 * |
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Application publication date: 20151202 |
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