CN105116532A - Method for generating tunable non-gradient optical force by linear polarization non-planar optical waves at surface of vanadium dioxide/metal multilayer core-shell - Google Patents
Method for generating tunable non-gradient optical force by linear polarization non-planar optical waves at surface of vanadium dioxide/metal multilayer core-shell Download PDFInfo
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- CN105116532A CN105116532A CN201510428956.6A CN201510428956A CN105116532A CN 105116532 A CN105116532 A CN 105116532A CN 201510428956 A CN201510428956 A CN 201510428956A CN 105116532 A CN105116532 A CN 105116532A
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Abstract
The invention relates to a method for generating a tunable non-gradient optical force by linear polarization non-planar optical waves at the surface of a vanadium dioxide/metal multilayer core-shell. The technical scheme of the method comprises the steps of enabling the vanadium dioxide/metal multilayer core-shall to deviate from the center of an incident optical axis under irradiation of the linear polarization non-planar optical waves, damaging symmetrical distribution of Poynting vectors around the multilayer core-shell, enabling the total Poynting vector on the multilayer core-shell 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 multilayer core-shell through changing the lattice structure of vanadium dioxide, and thus changing the direction and the size of the non-gradient optical force acted on the multilayer core-shell of the total Poynting vector so as to regulate and control the movement track of the multilayer core-shell in an incident field, thereby carrying out tunable capturing and screening on nano-sized molecules attached to the surface of the multilayer core-shell. The lattice structure of the vanadium dioxide in the vanadium dioxide/metal multilayer core-shell is changed through the modes of illumination, electrification, heating, pressurization and the like.
Description
Technical field
The present invention relates to a kind of linear polarization on-plane surface light wave that utilizes and produce the method for tunable non-gradient optical force in vanadium dioxide/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 vanadium dioxide/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, vanadium dioxide crystalline network 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.
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 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.
The present invention deal with problems adopt technical scheme as follows:
A kind of linear polarization on-plane surface light wave produces the method for tunable non-gradient optical force in vanadium dioxide/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 vanadium dioxide/metallic multilayer core-shell structure copolymer body, the Poynting vector destroyed around vanadium dioxide/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, by changing the crystalline network of vanadium dioxide, vanadium dioxide is made to change the metallic state of tetragonal into by the insulation figure of monocline, 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, titanium dioxide vanadium layers 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 is linear polarization nonplanar wave, and type comprises high bass wave, Bezier ripple, Airy ripple etc.; Incident light vertical irradiation vanadium dioxide/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 vanadium dioxide/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 vanadium dioxide/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 vanadium dioxide/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, pulsed laser deposition, So-Gel method etc.
Described surface is with the vanadium dioxide/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, can be changed the crystalline network of wherein vanadium dioxide by modes such as illumination, energising, heating and pressurizations, namely vanadium dioxide is changed into the metallic state of tetragonal by the insulation figure of monocline.
Present system is made up of light source, microscope and optical force display.Vanadium dioxide/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, vanadium dioxide/metallic multilayer core-shell structure copolymer body is made to depart from incident light axis (z-axis) center, the Poynting vector destroyed around vanadium dioxide/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, by changing the crystalline network of vanadium dioxide, 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 vanadium dioxide/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 vanadium dioxide/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 vanadium dioxide/metallic multilayer core-shell structure copolymer body of nanometer-size molecular.
Fig. 3 is that the non-gradient optical force that can be produced by linearly polarized light catches the system testing schematic diagram of surface with the vanadium dioxide/metallic multilayer core-shell structure copolymer body of nanometer-size molecular.
In figure: 1 titanium dioxide vanadium layers, 2 metal levels, 3 vanadium dioxide/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 titanium dioxide vanadium layers 1, metal level 2, vanadium dioxide/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 vanadium dioxide/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 vanadium dioxide/metallic multilayer core-shell structure copolymer body 3 outside surface attachment nanometer-size molecular 4, as shown in accompanying drawing 1 (b).
Then, the vanadium dioxide 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 titanium dioxide vanadium layers 1 is the insulation figure of monocline, Poynting vector around the vanadium dioxide/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. vanadium dioxide/metallic multilayer core-shell structure copolymer body 3 is non-vanishing, produce the non-gradient optical force pointing to light beam periphery, make vanadium dioxide/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 vanadium dioxide/metallic multilayer core-shell structure copolymer body 3 surface to the motion of light beam periphery, as shown in accompanying drawing 2 (a).
Afterwards, by modes such as illumination, energising, heating and pressurizations, the insulation figure of the monocline of titanium dioxide vanadium layers 1 is converted into the metallic state of tetragonal, total Poynting vector direction on vanadium dioxide/metallic multilayer core-shell structure copolymer body 3 surface and size are changed, produce the non-gradient optical force pointing to beam center, vanadium dioxide/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, titanium dioxide vanadium layers 1 is made to become the insulator of monocline again by the metallic state of tetragonal by modes such as cooling, illumination, non-gradient optical force that now vanadium dioxide/metallic multilayer core-shell structure copolymer body 3 is subject to outwards becomes again again, vanadium dioxide/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 crystalline network of vanadium dioxide like this, control the vanadium dioxide/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 vanadium dioxide/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 vanadium dioxide 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 vanadium dioxide/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 vanadium dioxide 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 vanadium dioxide/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.Vanadium dioxide/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 crystalline network of vanadium dioxide in the vanadium dioxide 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 (7)
1. a linear polarization on-plane surface light wave produces the method for tunable non-gradient optical force in vanadium dioxide/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 vanadium dioxide/metallic multilayer core-shell structure copolymer body, the Poynting vector destroyed around vanadium dioxide/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, by changing the crystalline network of vanadium dioxide, vanadium dioxide is made to change the metallic state of tetragonal into by the insulation figure of monocline, change the total Poynting vector distribution 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 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, and the change with z changes ,-∞ <z<+ ∞, multilayer core-shell structure copolymer body is formed by metal level, titanium dioxide vanadium layers 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 vanadium dioxide/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 described 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 metal level is Al, Ag, Au, Cu, Ni, Pt.
5. method according to claim 4, is characterized in that, nanometer-size molecular has achirality structure or chiral structure.
6. the method according to claim 1,2,4 or 5, it is characterized in that, 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, pulsed laser deposition, So-Gel method.
7. the method according to claim 1,2,4 or 5, it is characterized in that, described surface is with the vanadium dioxide/metallic multilayer core-shell structure copolymer body of nanometer-size molecular, by the crystalline network of illumination, energising, heating and pressurizing altered wherein vanadium dioxide, namely vanadium dioxide is changed into the metallic state of tetragonal by the insulation figure of monocline.
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| 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 |
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| 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 |
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