CN105182516A - Method for tunably capturing and screening particles above liquid crystal substrate through utilizing linearly polarized planar light waves - Google Patents
Method for tunably capturing and screening particles above liquid crystal substrate through utilizing linearly polarized planar light waves Download PDFInfo
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- CN105182516A CN105182516A CN201510430972.9A CN201510430972A CN105182516A CN 105182516 A CN105182516 A CN 105182516A CN 201510430972 A CN201510430972 A CN 201510430972A CN 105182516 A CN105182516 A CN 105182516A
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Abstract
The invention relates to a method for tunably capturing and screening particles above a liquid crystal substrate through utilizing linearly polarized planar light waves. According to the method, the particles are arranged above the flat liquid crystal substrate plate; the symmetrical distribution of Poynting vectors around the particles is destroyed, so that the total Poynting vector on the particles is not zero, and therefore, a non-gradient optical force can be generated; the distribution direction of liquid crystal molecules, namely, the direction of the axes of the liquid crystal molecules, is changed, so that the direction and magnitude of the total Poynting vector on the particles can be changed, and therefore, the direction and magnitude of the non-gradient optical force which is acted on the particles by the total Poynting vector can be changed, and as a result, the movement tracks of the particles in an incident light field can be adjusted and controlled, and tunable capture and screening of nanoscale molecules attached to the surfaces of the particles can be realized; and the direction of the axes of the liquid crystal molecules can be changed through modes such as illumination, electrification, heating and pressurization.
Description
Technical field
The present invention relates to a kind of plane of linear polarization light wave to the tunable method of catching and screening being in liquid crystal material types of flexure particulate, 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 nanometer-size molecular be separated, because which limit the scope of its effective object.So the present invention proposes, being positioned at the covering of the microparticle surfaces above liquid crystal material substrate flat board nanometer-size molecular, to make it produce non-gradient optical force around 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 above tuning liquid crystal material substrate flat board, particulate is subject to, thus realize catching and screening the nanometer-size molecular being attached to 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 liquid crystal material 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 being in liquid crystal material types of flexure particulate, particulate is placed in above liquid crystal material substrate flat board, the Poynting vector that this liquid crystal material substrate flat board destroys around particulate is symmetrical, make the total Poynting vector on particulate non-vanishing, produce non-gradient optical force, by changing the liquid crystal material molecules direction of principal axis of liquid crystal material substrate flat board, change the total Poynting vector distribution on particulate, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on particulate, regulate and control the movement locus of particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to microparticle surfaces, wherein, particulate is placed in above liquid crystal material substrate flat board, microparticle material can be medium or metal, the length of liquid crystal material substrate, wide, high in 10 nanometers to 10 meters, the distance of particulate and liquid crystal material substrate planar surface is l (l>0), the profile of 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; It is dull and stereotyped that incident light beam strikes direction is parallel to liquid crystal material substrate, 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 surface is with the particulate of nanometer-size molecular, and microparticle 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 liquid crystal material substrate is dull and stereotyped, 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 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 liquid crystal material substrate is dull and stereotyped, and liquid crystal material substrate flat board 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 liquid crystal material substrate is dull and stereotyped, can be changed 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 liquid crystal material substrate flat board is placed in before test bottom the sample cell that water or oil are housed, then particulate surface being had nanometer-size molecular is placed in the sample cell that water or oil are housed, be placed in above liquid crystal material substrate flat board simultaneously, plane of linear polarization wave source enters from the sidewall of sample cell, irradiate particulate, the Poynting vector destroyed around particulate due to liquid crystal material substrate flat board is symmetrical, makes the total Poynting vector on particulate non-vanishing, produces non-gradient optical force; 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 total Poynting vector distribution of microparticle surfaces above liquid crystal material substrate flat board, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on particulate, regulate and control the movement locus of particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to microparticle surfaces.Microscope can be used for observing the surperficial movement locus produced under incident light effect with the 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 particulate schematic diagram of surface with nanometer-size molecular.
Fig. 2 is the process schematic that the non-gradient optical force produced by linearly polarized light caught and screened that the surface be in above liquid crystal material substrate flat board has the particulate of nanometer-size molecular.
Fig. 3 is the test macro schematic diagram that the non-gradient optical force produced by linearly polarized light caught and screened that the surface be in above liquid crystal material substrate flat board has the particulate of nanometer-size molecular.
In figure: 1 particulate, 2 nanometer-size molecular, 3 liquid crystal material 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, particulate 1 is produced, as shown in accompanying drawing 1 (a) by Material growth technique.Wherein particulate geometric configuration and size can adopt finite time-domain method of difference, finite element method scheduling algorithm is determined.
Secondly, at particulate 1 outside surface attachment nanometer-size molecular 2, as shown in accompanying drawing 1 (b).
Then, the particulate 1 of surface attachment nanometer-size molecular 2 is placed in dull and stereotyped 3 surfaces of liquid crystal material substrate, distance is l (l>0), when incident light is plane of linear polarization ripple and the liquid crystal molecule axle of liquid crystal material substrate flat board 3 is consistent with optical axis direction, the Poynting vector be in around the particulate 1 above liquid crystal material substrate flat board 3 is asymmetric distribution, namely the total Poynting vector on particulate 1 is non-vanishing, produce the non-gradient optical force along sensing right front, incident light direction, particulate 1 is moved along the right front in incident light direction, and then drive the nanometer-size molecular 2 being attached to 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 substrate flat board 3 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 particulate 1 surface and size are changed, produce the non-gradient optical force along sensing left front, incident light direction, 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 substrate flat board 3 is become again consistent with optical axis direction, the non-gradient optical force that now particulate 1 is subject to has become again the non-gradient optical force along sensing right front, incident light direction again, 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 liquid crystal molecule direction of principal axis in liquid crystal material substrate flat board 3 like this, control the movement locus of particulate 1 in incident field, finally achieve and catch the tunable of the nanometer-size molecular 2 being attached to particulate 1 surface and screen.
Present system is formed primarily of light source 4, microscope 5 and optical force display 6.First liquid crystal material substrate flat board 3 is placed in the bottom of the sample cell 7 that water or oil are housed before test, then the particulate 1 of surface attachment nanometer-size molecular 2 is placed in sample cell 7, and be placed in above liquid crystal material substrate flat board 3.Light source 4 produces plane of linear polarization ripple and enters from the sidewall of sample cell 7, horizontal irradiation particulate 1, realizes arresting and handling of the particulate 1 of effects on surface attachment nanometer-size molecular 2.Microscope 5 can be used for the movement locus observing the 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 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 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 of liquid crystal material in liquid crystal material substrate flat board 3 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 being in liquid crystal material types of flexure particulate, it is characterized in that, particulate is placed in above liquid crystal material substrate flat board, the Poynting vector that this liquid crystal material substrate flat board destroys around particulate is symmetrical, make the total Poynting vector on particulate non-vanishing, produce non-gradient optical force, by changing the liquid crystal material molecules direction of principal axis of liquid crystal material substrate flat board, change the total Poynting vector distribution on particulate, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on particulate, regulate and control the movement locus of particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to microparticle surfaces, wherein, particulate is placed in above liquid crystal material substrate flat board, microparticle material is medium or metal, the length of liquid crystal material substrate, wide, high in 10 nanometers to 10 meters, the distance of particulate and liquid crystal material substrate planar surface is l, l>0, the profile of 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; It is dull and stereotyped that incident light beam strikes direction is parallel to liquid crystal material substrate, 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 adopts Wavelength tunable laser, semiconductor continuously or quasi-continuous lasing or light emitting diode.
4. method according to claim 3, is characterized in that, microparticle material is 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 3, it is characterized in that, 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 3 or 4, it is characterized in that, nanometer-size molecular has achirality structure or chiral structure.
7. the liquid crystal material substrate according to claim 1 or 2 or 3 or 4 is dull and stereotyped, it is characterized in that, liquid crystal material substrate flat board 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. liquid crystal material substrate according to claim 1 or 2 or 3 or 4 is dull and stereotyped, it is characterized in that, 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.
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Citations (4)
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|---|---|---|---|---|
| CN1659935A (en) * | 2002-04-10 | 2005-08-24 | 阿尔利克斯公司 | Apparatus and method to generate and control optical traps to manipulate small particles |
| JP2006235319A (en) * | 2005-02-25 | 2006-09-07 | Japan Science & Technology Agency | Device for controlling movement of particulate |
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| CN103676126A (en) * | 2013-12-20 | 2014-03-26 | 同济大学 | Operation instrument for optical tweezers |
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2015
- 2015-07-21 CN CN201510430972.9A patent/CN105182516B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| CN1659935A (en) * | 2002-04-10 | 2005-08-24 | 阿尔利克斯公司 | Apparatus and method to generate and control optical traps to manipulate small particles |
| JP2006235319A (en) * | 2005-02-25 | 2006-09-07 | Japan Science & Technology Agency | Device for controlling movement of particulate |
| JP5035798B2 (en) * | 2007-08-31 | 2012-09-26 | 国立大学法人秋田大学 | Fine particle light capture and rotation control device |
| CN103676126A (en) * | 2013-12-20 | 2014-03-26 | 同济大学 | Operation instrument for optical tweezers |
Non-Patent Citations (4)
| Title |
|---|
| A.V.SEROV: "Ponderomotive nongradient force acting on a relativistic particle crossing an inhomogeneous electromagnetic wave", 《JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS》 * |
| TUN CAO ET AL: "Ultrafast beam steering using gradient Au-Ge2Sb2Te5 -Au plasmonic resonators", 《OPTICS EXPRESS》 * |
| ZHIPENG，LI ET AL: "Ultrasensitive Size-Selection ofPlasmonic Nanoparticles by Fano Interference Optical Force", 《ACS NANO》 * |
| 张敏等: "贝塞尔光束中瑞利粒子所受横向力的参数理论分析", 《光学与光电技术》 * |
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