CN105137587A - Method of applying tunable non-gradient optical force by linear polarization non-planar light wave to particle wrapped in graphene thin layer - Google Patents
Method of applying tunable non-gradient optical force by linear polarization non-planar light wave to particle wrapped in graphene thin layer Download PDFInfo
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Abstract
Provided is a method of applying tunable non-gradient optical force by linear polarization non-planar light waves to particles wrapped in graphene thin layers. The method includes the steps: making particles wrapped in graphene thin layers deviate from the center of an incident optical axis, destroying symmetrical distribution of Poynting vectors around the particles wrapped in graphene thin layers to enable the total Poynting vector of the particles wrapped in graphene thin layers not to be zero, and producing non-gradient optical force; changing the direction and magnitude of the total Poynting vector of the particles wrapped in graphene thin layers by changing the distribution of Fermi energy of graphene, then changing the direction and magnitude of the non-gradient optical force which is applied by the total Poynting vector to the particles wrapped in graphene thin layers to regulate and control the movement locus of the particles wrapped in graphene thin layers in an incident optical light field, and conducting tunable capturing and screening on nano-dimension molecules attached to the surfaces of the graphene thin layers; and changing the distribution of Fermi energy of graphene by changing an applied electric field, the temperature, the injection light intensity, the thickness of graphene or the like, and then changing the dielectric coefficient and conductivity of graphene.
Description
Technical field
The present invention relates to a kind of method utilizing linear polarization on-plane surface light wave to produce tunable non-gradient optical force on the particulate of parcel Graphene thin layer, 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 at the graphenic surface of parcel Graphene lamellar particles, makes it produce non-gradient optical force around parcel Graphene lamellar particles under linear polarization on-plane surface light-wave irradiation; Then, the modes such as the thickness changing extra electric field, temperature, injection light intensity and Graphene are utilized to change the fermi-distribution of Graphene, and then change dielectric coefficient and the conductivity of Graphene, the non-gradient optical force size and Orientation that tuning parcel Graphene lamellar particles is subject to, thus realize catching and screening the nanometer-size molecular being attached to Graphene thin layer 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:
The particulate wrapping up Graphene thin layer produces a method for tunable non-gradient optical force, is a kind of method utilizing linear polarization on-plane surface light wave to produce tunable non-gradient optical force on the particulate of parcel Graphene thin layer.Under linear polarization on-plane surface light-wave irradiation, incident light axis (z-axis) center is departed from by making the particulate of parcel Graphene thin layer, the Poynting vector destroyed around the particulate wrapping up Graphene thin layer is symmetrical, make the total Poynting vector on the particulate of parcel Graphene thin layer non-vanishing, produce non-gradient optical force, and this total Poynting vector changes with the change of the Fermi level of Graphene, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on the particulate of parcel Graphene thin layer, regulate and control the movement locus of particulate in incident field of parcel Graphene thin layer, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to Graphene thin layer surface, the particulate wherein wrapping up Graphene thin layer 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<+ ∞), wherein, the material of particulate can be metal or medium etc., and profile 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.
Described incident light is linear polarization nonplanar wave, and type comprises high bass wave, Bezier ripple, Airy ripple etc.; The particulate of incident light vertical irradiation parcel Graphene thin layer; 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.
The material of the particulate of described parcel Graphene thin layer can be metal or medium, and 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 Graphene thin layer is made up of M layer carbon atomic layer, wherein 1≤M≤100.
The described nanometer-size molecular being attached to Graphene thin layer surface can have achirality structure or chiral structure, as antigen, and antibody, enzyme, hormone, amine, peptide class, amino acid, vitamin etc.
The particulate of described parcel Graphene thin layer 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.
The particulate of described parcel Graphene thin layer, can change the fermi-distribution of Graphene, and then change dielectric coefficient and the conductivity of Graphene by changing the modes such as the thickness of extra electric field, temperature, injection light intensity and Graphene.
Present system is made up of light source, microscope and optical force display.The particulate before test, surface being had the parcel Graphene thin layer of 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, the particulate of parcel Graphene thin layer is made to depart from incident light axis (z-axis) center, the Poynting vector destroyed around parcel Graphene lamellar particles is symmetrical, make the total Poynting vector on the particulate of parcel Graphene thin layer non-vanishing, produce non-gradient optical force; Then, the total Poynting vector on the particulate of parcel Graphene thin layer is changed by the fermi-distribution changing Graphene, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on the particulate of parcel Graphene thin layer, regulate and control the movement locus of particulate in incident field of parcel Graphene thin layer, thus carry out tunablely catching and screening to the nano-scale achiral molecule being attached to Graphene thin layer surface.The movement locus that the particulate that microscope can be used for the surperficial parcel Graphene thin layer with nano-scale achiral molecule of observation produces under incident light effect.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 particulate schematic diagram of surface with the parcel Graphene thin layer of 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 particulate of the parcel Graphene thin layer 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 particulate of the parcel Graphene thin layer of nanometer-size molecular.
In figure: 1 Graphene thin layer, 2 particulates, the particulate of 3 parcel Graphene thin layers, 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: 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, produce particulate 2 by Material growth technique and at its surface coverage Graphene thin layer 1, form the particulate 3 of parcel Graphene thin layer, as shown in accompanying drawing 1 (a).Wherein wrap up the geometric configuration of the particulate 3 of Graphene thin layer and size can adopt finite time-domain method of difference, finite element method scheduling algorithm is determined.
Secondly, at the particulate 3 outside surface attachment nanometer-size molecular 4 of parcel Graphene thin layer, as shown in accompanying drawing 1 (b).
Then, the particulate 3 of the parcel Graphene thin layer of surface attachment nanometer-size molecular 4 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 Graphene Fermi level is lower (Fermi level <0.1eV), Poynting vector around the particulate 3 being in the parcel Graphene thin layer of the central symmetry axis departing from incident light wave is asymmetric distribution, namely the total Poynting vector wrapped up on the particulate 3 of Graphene thin layer is non-vanishing, produce the non-gradient optical force pointing to light beam periphery, make the particulate 3 of parcel Graphene thin layer to the motion of light beam periphery, and then drive the nanometer-size molecular 4 on particulate 3 surface being attached to parcel Graphene thin layer to the motion of light beam periphery, as shown in accompanying drawing 2 (a).
Afterwards, the Fermi level (Fermi level >0.1eV) of Graphene is improved by increasing the modes such as the thickness of extra electric field, temperature, injection light intensity and Graphene, total Poynting vector direction on particulate 3 surface of parcel Graphene thin layer and size are changed, produce the non-gradient optical force pointing to beam center, the drive of the particulate 3 of parcel Graphene thin layer 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, the Fermi level (Fermi level <0.1eV) of Graphene is reduced by reducing the modes such as the thickness of extra electric field, temperature, injection light intensity and Graphene, the non-gradient optical force that the particulate 3 now wrapping up Graphene thin layer is subject to becomes again again outwards, the particulate 3 of parcel Graphene thin layer drives nanometer-size molecular 4 to the motion of light beam periphery, as shown in accompanying drawing 2 (c).
We are by changing the Fermi level of Graphene like this, control the movement locus of particulate 3 in incident field of parcel Graphene thin layer, finally achieve and catch the tunable of nanometer-size molecular 4 on particulate 3 surface being attached to parcel Graphene thin layer and screen.
Present system is formed primarily of light source 5, microscope 6 and optical force display 7.Can the particulate 3 of the parcel Graphene thin layer of surface attachment nanometer-size molecular 4 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 parcel Graphene lamellar particles 3 of effects on surface attachment nanometer-size molecular 4.The movement locus that microscope 6 can be used for observing the parcel Graphene lamellar particles 3 of micro-surface attachment nanometer-size molecular 4 to produce under incident light effect.The non-gradient optical force that linear polarization nonplanar wave produces at the parcel Graphene lamellar particles 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.The parcel Graphene lamellar particles 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 Graphene Fermi level in the particulate 3 of the parcel Graphene thin layer of surface attachment nanometer-size molecular 4 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 wave produces the method for tunable non-gradient optical force on the particulate of parcel Graphene thin layer, 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 the particulate of parcel Graphene thin layer, the Poynting vector destroyed around the particulate wrapping up Graphene thin layer is symmetrical, make the total Poynting vector on the particulate of parcel Graphene thin layer non-vanishing, produce non-gradient optical force, and this total Poynting vector changes with the change of the Fermi level of Graphene, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on the particulate of parcel Graphene thin layer, regulate and control the movement locus of particulate in incident field of parcel Graphene thin layer, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to Graphene thin layer surface, the particulate wherein wrapping up Graphene thin layer 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<+ ∞, wherein, the material of particulate is metal or medium, and profile is spheroid, spheroid, right cylinder, cone, prism, square, rectangular parallelepiped, 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 linear polarization nonplanar wave, and type comprises high bass wave, Bezier ripple, Airy ripple; The particulate of incident light vertical irradiation parcel Graphene thin layer; 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, the microparticle material of described parcel Graphene thin layer is metal or medium, and metal is Al, Ag, Au, Cu, Ni, Pt, and medium is that semiconductor material is as Si, SiO
2, GaAs, InP, Al
2o
3in one or polymkeric substance.
5. method according to claim 4, is characterized in that, described parcel Graphene thin layer is made up of M layer carbon atomic layer, wherein 1≤M≤100.
6. the method according to claim 1,2,4 or 5, is characterized in that, the described nanometer-size molecular being attached to Graphene thin layer surface has achirality structure or chiral structure.
7. the method according to claim 1,2,4 or 5, it is characterized in that, the particulate of described parcel Graphene thin layer 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 1,2,4 or 5, it is characterized in that, the particulate of described parcel Graphene thin layer changes the fermi-distribution of Graphene by the thickness changing extra electric field, temperature, injection light intensity and Graphene, and then changes dielectric coefficient and the conductivity of Graphene.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110444314A (en) * | 2019-08-12 | 2019-11-12 | 苏州大学 | A kind of light control system and light control method based on graphene |
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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 |
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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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| CN110444314A (en) * | 2019-08-12 | 2019-11-12 | 苏州大学 | A kind of light control system and light control method based on graphene |
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