CN105116536A - Method for producing tunable non-gradient optical force on surface of liquid crystal material/metal multilayer nuclear-shell based on linearly-polarized non-planar light - Google Patents
Method for producing tunable non-gradient optical force on surface of liquid crystal material/metal multilayer nuclear-shell based on linearly-polarized non-planar light Download PDFInfo
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Abstract
Provided is a method for producing a tunable non-gradient optical force on the surface of a liquid crystal material/metal multilayer nuclear-shell based on linearly-polarized non-planar light, comprising the following steps: damaging the symmetric distribution of a Poynting vector around a multilayer nuclear-shell, making the total Poynting vector on the multilayer nuclear-shell not be zero, and producing a non-gradient optical force; and then, changing the direction and size of the total Poynting vector on the multilayer nuclear-shell by changing the arrangement direction of the liquid crystal molecules in a liquid crystal material (namely, the axis direction of the liquid crystal molecules), further changing the direction and size of the non-gradient optical force applied by the total Poynting vector to the multilayer nuclear-shell to adjust the motion trajectory of the multilayer nuclear-shell in an incident light field, and capturing and screening nano-sized molecules attached to the surface of the multilayer nuclear-shell in a tunable manner, wherein the axis direction of the liquid crystal molecules of the liquid crystal material in the liquid crystal material/metal multilayer nuclear-shell is changed by means of lighting, electrifying, heating, pressurizing, and the like.
Description
Technical field
This programme relates to a kind of linear polarization on-plane surface light wave that utilizes and produces the method for tunable non-gradient optical force in liquid crystal material/metallic multilayer core-shell structure copolymer surface, 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 to cover nanometer-size molecular in liquid crystal material/metallic multilayer core-shell structure copolymer surface, makes it produce non-gradient optical force around multilayer core-shell structure copolymer body under linear polarization on-plane surface 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 multilayer core-shell structure copolymer body is subject to, thus realize catching and screening the nanometer-size molecular being attached to multilayer core-shell structure copolymer surface, wherein nanometer-size molecular can be achirality structure.
Goal 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 achirality nanometer-size molecular is caught and screened to the non-gradient optical force produced by linearly polarized light of the advantages such as active is tuning, can be used for biology, the field such as medical science and nanometer manipulation.
Summary of the invention
The present invention deal with problems adopt technical scheme as follows:
A kind of linear polarization on-plane surface light wave that utilizes produces the method for tunable non-gradient optical force in liquid crystal material/metallic multilayer core-shell structure copolymer surface, under linear polarization on-plane surface light-wave irradiation, incident light axis (z-axis) center is departed from by making liquid crystal material/metallic multilayer core-shell structure copolymer body, the Poynting vector destroyed around liquid crystal material/metallic multilayer core-shell structure copolymer body is symmetrical, make the total Poynting vector on multilayer core-shell structure copolymer body non-vanishing, produce non-gradient optical force, and this total Poynting vector changes with the axial change of liquid crystal molecule of liquid crystal material, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on multilayer core-shell structure copolymer body, regulate and control the movement locus of multilayer core-shell structure copolymer body in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to multilayer core-shell structure copolymer surface, wherein multilayer core-shell structure copolymer body is in incident beam, and off-beams is l (0<l≤w (z)) along the distance of the central symmetry axis (z-axis) of incident direction, w (z) is incident light beamwidth, change with z changes (-∞ <z<+ ∞), multilayer core-shell structure copolymer body is formed by metal level, liquid crystal material layer alternating growth, and the number of plies is n layer (n>1), and every layer thickness is in 1 nanometer to 1 micron, the profile of multilayer core-shell structure copolymer body can be the polyhedrons such as surface geometry body or prism, square, rectangular parallelepiped such as spheroid, spheroid, right cylinder, cone, and volume is at 1 cubic nanometer to 1000 cu μ m, the center of multilayer core-shell structure copolymer body center and shell can be overlapping or be separated.
Described incident light, incident light is linear polarization nonplanar wave, and type comprises high bass wave, Bezier ripple, Airy ripple etc.; Incident light vertical irradiation liquid crystal material/metallic multilayer core-shell structure copolymer body; Frequency range is 0.3 μm ~ 20 μm; 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 liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, and metal level is Al, Ag, Au, Cu, Ni, Pt etc.
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/metallic multilayer core-shell structure copolymer body 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/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, sandwich construction 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.
Described surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, the liquid crystal molecule direction of principal axis of wherein liquid crystal material can be changed by modes such as illumination, energising, heating and pressurizations, and then change birefraction and the dielectric coefficient of liquid crystal material.
Present system is made up of light source, microscope and optical force display.Liquid crystal material/metallic multilayer core-shell structure copolymer the body before test, surface being had nanometer-size molecular is placed in the sample cell that water or oil are housed, under the vertical irradiation of linear polarization on-plane surface light wave, liquid crystal material/metallic multilayer core-shell structure copolymer body is made to depart from incident light axis (z-axis) center, the Poynting vector destroyed around liquid crystal material/metallic multilayer core-shell structure copolymer body is symmetrical, make the total Poynting vector on multilayer core-shell structure copolymer body non-vanishing, produce 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 multilayer core-shell structure copolymer body, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on multilayer core-shell structure copolymer body, regulate and control the movement locus of multilayer core-shell structure copolymer body in incident field, thus carry out tunablely catching and screening to the nano-scale achiral molecule being attached to multilayer core-shell structure copolymer surface.Microscope can be used for observing the surperficial movement locus produced under incident light effect with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nano-scale achiral molecule.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 linearly polarized light.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/metallic multilayer core-shell structure copolymer body 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/metallic multilayer core-shell structure copolymer body 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/metallic multilayer core-shell structure copolymer body of nanometer-size molecular.
In figure: 1 liquid crystal material layer, 2 metal levels, 3 liquid crystal materials/metallic multilayer core-shell structure copolymer body, 4 nanometer-size molecular, 5 light sources, 6 microscopes, 7 optical force displays, 8 sample cells, 9 thermostats, 10CCD video camera, 11 monitors, 12 computing machines, 13 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: 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, n layer (n>1) is produced by liquid crystal material layer 1, metal level 2, liquid crystal material/metallic multilayer core-shell structure copolymer body 3 alternately, as shown in accompanying drawing 1 (a) by Material growth technique.Geometric configuration and the size of wherein liquid crystal material/metallic multilayer core-shell structure copolymer body 3 can adopt finite time-domain method of difference, finite element method scheduling algorithm is determined.
Secondly, at liquid crystal material/metallic multilayer core-shell structure copolymer body 3 outside surface attachment nanometer-size molecular 4, as shown in accompanying drawing 1 (b).
Then, the liquid crystal material of surface attachment nanometer-size molecular 4/metallic multilayer core-shell structure copolymer body 3 is placed in the distance l (0<l≤w (z)) of the central symmetry axis (z-axis) departing from incident light wave, wherein w (z) is incident light beamwidth, change with z changes (-∞ <z<+ ∞), when incident light is linear polarization nonplanar wave and the liquid crystal molecule axle of liquid crystal material layer 1 is consistent with optical axis direction, Poynting vector around the liquid crystal material/metallic multilayer core-shell structure copolymer body 3 being in the central symmetry axis departing from incident light wave is asymmetric distribution, total Poynting vector on i.e. liquid crystal material/metallic multilayer core-shell structure copolymer body 3 is non-vanishing, produce the non-gradient optical force pointing to light beam periphery, make liquid crystal material/metallic multilayer core-shell structure copolymer body 3 to the motion of light beam periphery, and then drive the nanometer-size molecular 4 being attached to liquid crystal material/metallic multilayer core-shell structure copolymer body 3 surface to the motion of light beam periphery, 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 layer 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/metallic multilayer core-shell structure copolymer body 3 surface and size are changed, produce the non-gradient optical force pointing to beam center, liquid crystal material/metallic multilayer core-shell structure copolymer body 3 drive is made to be attached to the nanometer-size molecular 4 on its surface to beam center motion, 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 layer 1 is become again consistent with optical axis direction, non-gradient optical force that now liquid crystal material/metallic multilayer core-shell structure copolymer body 3 is subject to outwards becomes again again, liquid crystal material/metallic multilayer core-shell structure copolymer body 3 drives nanometer-size molecular 4 to the motion of light beam periphery, 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 liquid crystal material/movement locus of metallic multilayer core-shell structure copolymer body 3 in incident field, the tunable of nanometer-size molecular 4 finally achieved being attached to liquid crystal material/metallic multilayer core-shell structure copolymer body 3 surface catches and screens.
Present system is formed primarily of light source 5, microscope 6 and optical force display 7.Can the liquid crystal material of surface attachment nanometer-size molecular 4/metallic multilayer core-shell structure copolymer body 3 be placed in sample cell 8 before test, light source 5 produces linear polarization nonplanar wave, directive sample cell 8, realizes arresting and handling of the liquid crystal material/metallic multilayer core-shell structure copolymer body 3 of effects on surface attachment nanometer-size molecular 4.Microscope 6 can be used for the movement locus observing the liquid crystal material of micro-surface attachment nanometer-size molecular 4/metallic multilayer core-shell structure copolymer body 3 produce under incident light effect.The non-gradient optical force that linear polarization nonplanar wave produces at the liquid crystal material/metallic multilayer core-shell structure copolymer body 3 of surface attachment nanometer-size molecular 4 is recorded by luminous power display 7.Present system also comprises thermostat 9, ccd video camera 10, monitor 11, computing machine 12 and video recorder 13 etc. (shown in accompanying drawing 3) simultaneously.Liquid crystal material/metallic multilayer core-shell structure copolymer the body 3 of the surface attachment nanometer-size molecular 4 under utilizing ccd video camera 10 pairs of linear polarization nonplanar waves to irradiate carries out Real-Time Monitoring, and the vision signal of gained is shown at display.Video recorder 13 can be used for recording image.Sample cell 8 is connected with thermostat 9, and the liquid crystal molecule direction of principal axis of liquid crystal material in the liquid crystal material of surface attachment nanometer-size molecular 4/metallic multilayer core-shell structure copolymer body 3 is changed with the temperature variation of sample cell 8.Computing machine 12 can store the visual field information that microscope 6 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 linear polarization on-plane surface light produces the method for tunable non-gradient optical force in liquid crystal material metallic multilayer core-shell structure copolymer surface, it is characterized in that, under linear polarization on-plane surface light-wave irradiation, incident light axis (z-axis) center is departed from by making liquid crystal material/metallic multilayer core-shell structure copolymer body, the Poynting vector destroyed around liquid crystal material/metallic multilayer core-shell structure copolymer body is symmetrical, make the total Poynting vector on multilayer core-shell structure copolymer body non-vanishing, produce non-gradient optical force, and this total Poynting vector changes with the axial change of liquid crystal molecule of liquid crystal material, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on multilayer core-shell structure copolymer body, regulate and control the movement locus of multilayer core-shell structure copolymer body in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to multilayer core-shell structure copolymer surface, wherein multilayer core-shell structure copolymer body is in incident beam, and off-beams is l along the distance of the central symmetry axis (z-axis) of incident direction, 0<l≤w (z), w (z) is incident light beamwidth, change with z changes,-∞ <z<+ ∞, multilayer core-shell structure copolymer body is formed by metal level, liquid crystal material layer alternating growth, and the number of plies is n layer, n>1, every layer thickness is in 1 nanometer to 1 micron, the profile of multilayer core-shell structure copolymer body is surface geometry body or polyhedron, and volume is at 1 cubic nanometer to 1000 cu μ m, multilayer core-shell structure copolymer body center is overlapping with the center of shell or be separated.
2. method according to claim 1, is characterized in that, incident light is linear polarization nonplanar wave, and type comprises high bass wave, Bezier ripple, Airy ripple; Incident light vertical irradiation liquid crystal material/metallic multilayer core-shell structure copolymer body; Frequency range is 0.3 μm ~ 20 μm; 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, described surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, and metal level is Al, Ag, Au, Cu, Ni, Pt.
5. method according to claim 4, is characterized in that, surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, 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. according to the method for claim 1 or 2 or 4 or 5, it is characterized in that, described surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, and nanometer-size molecular has achirality structure or chiral structure.
7. according to the method for claim 1 or 2 or 4 or 5, it is characterized in that, described surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, sandwich construction 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. according to the method for claim 1 or 2 or 4 or 5, it is characterized in that, described surface is with the liquid crystal material/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, 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 change birefraction and the dielectric coefficient of liquid crystal material.
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| CN106154562A (en) * | 2016-06-28 | 2016-11-23 | 浙江师范大学 | A kind of salt free ligands autoacceleration Airy beam freely regulate and control method and device |
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Application publication date: 20151202 |