CN105116534B - Method for capturing and screening particle above topological insulator substrate in tunable manner through linearly-polarized planar optical wave - Google Patents
Method for capturing and screening particle above topological insulator substrate in tunable manner through linearly-polarized planar optical wave Download PDFInfo
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- CN105116534B CN105116534B CN201510429872.4A CN201510429872A CN105116534B CN 105116534 B CN105116534 B CN 105116534B CN 201510429872 A CN201510429872 A CN 201510429872A CN 105116534 B CN105116534 B CN 105116534B
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Abstract
The invention provides a method for capturing and screening particle above a topological insulator substrate in a tunable manner through linearly-polarized planar optical wave, comprising the following steps: damaging the symmetric distribution of a Poynting vector around a particle, making the total Poynting vector on the particle not be zero, and producing a non-gradient optical force; and then, changing the direction and size of the total Poynting vector on the particle by changing the quantum state of a topological insulator substrate slab, further changing the direction and size of the non-gradient optical force applied by the total Poynting vector to the particle to adjust the motion trajectory of the particles in an incident light field, and then, capturing and screening nano-sized molecules attached to the surface of the particle in a tunable manner, wherein reversible quantum phase transition of the topological insulator substrate slab from topological non-mediocrity to topological mediocrity is realized by means of lighting, electrifying, heating, pressurizing, an additional magnetic field, and the like.
Description
Technical field
The present invention relates to a kind of plane of linear polarization light wave is to the tunable capture in topological insulator substrate top particulate
With the method for screening, the fields such as biology, medical science and nanometer manipulation are can be applicable to.
Background technology
Optical acquisition and screening to small items is always the study hotspot of optical field.Optical gradient forces are in various light
Learn and important role is play in capture technique, the optical tweezer for example realized by optical gradient forces and optics binding etc..However, light
Learn gradient force to have the shortcomings that generation equipment is complicated, untunable and defy capture and screen nanometer-size molecular.2008,
Ward, T.J. etc. propose that the optical gradient forces produced by circularly polarized light can capture and separate the chirality with nano-scale point
Son.But, circularly polarized incident light still needs using complicated equipment to produce, and is unfavorable for the practical application of system；And it is caught
Obtaining must have chiral structure with detached nanometer-size molecular, therefore limit the scope of its effective object.So, the present invention
Propose to cover nanometer-size molecular in the microparticle surfaces above topological insulator substrate flat board so as in plane of linear polarization light
Ripple produces non-gradient optical force under irradiating around particulate；Then, using topological insulator quantum state with additional light field, electric field,
The characteristic that temperature field, pressure field and magnetic field change and changes, tunes the non-ladder that topological insulator substrate flat board top particulate is subject to
Degree optical force size and Orientation, so as to realize the capture and screening of the nanometer-size molecular to being attached to microparticle surfaces, wherein receiving
Rice sized molecules can be achirality structure.
The content of the invention
It is an object of the invention to overcome capture using gradient optics power and screen this tradition side of nanometer-size molecular
Incident light source complexity (i.e. incident light is necessarily circular polarization or elliptical polarization), screening object limitation (the i.e. nanometer having in method
Sized molecules must have chiral structure), the gradient optics power that produced by circular polarization or elliptically polarized light is untunable, Yi Jinan
To capture the deficiency such as nano-scale achiral molecule, and provide it is a kind of have simple system, easy to operate, hypersensitive, it is supper-fast,
The non-gradient optical force capture produced by plane of linear polarization light wave of the advantages of actively tuning and screening are positioned at topological insulator lining
The method of the achirality nanometer-size molecular above base plate, can be used for the fields such as biology, medical science and nanometer manipulation.
A kind of plane of linear polarization light wave is to the tunable capture in topological insulator substrate top particulate and the side of screening
Method, by particulate topological insulator substrate flat board top is placed in, and the topological insulator substrate flat board destroys the Bo Yin around particulate
Booth vector is symmetrical, makes the total Poynting vector on particulate be not zero, and produces non-gradient optical force；By changing topology insulation
The quantum state of body substrate flat board, the total Poynting vector distribution on change particulate, and then the total Poynting vector of change act on micro-
The direction of the non-gradient optical force on grain and size regulating and controlling movement locus of the particulate in incident field, so as to being attached to
The nanometer-size molecular of microparticle surfaces carries out tunable capture and screening, wherein, particulate is placed on topological insulator substrate flat board
Side, microparticle material can be medium or metal, the length of topological insulator substrate at 10 nanometers to 10 meters, particulate and topology
The distance of insulator substrates planar surface is l (l>0)；The profile of particulate can be the surface geometries such as spheroid, cylinder, cone
The polyhedron such as body or prism, square, cuboid, volume is in 1 cubic nanometer to 1000 cu μ ms.
Described incident light is plane of linear polarization ripple；Incident light beam strikes are oriented parallel to topological insulator substrate flat board, frequency
Rate scope is 0.3 micron～20 microns, and power bracket is 0.1mW/ μm2～10mW/ μm2。
The light source of described incident light is using Wavelength tunable laser, continuous semiconductor or quasi-continuous lasing or sends out
Optical diode.
Particulate of the described surface with nanometer-size molecular, microparticle material can be metal or medium, wherein, metal can
To be Al, Ag, Au, Cu, Ni, Pt etc., medium can be semi-conducting material such as Si, SiO2、GaAs、InP、Al2O3Deng or polymerization
Thing.
Described topological insulator substrate flat board, topological insulator can be BixSb1-x、HgTe、Bi2Te3、Bi2Se3Or
Sb2Te3。
Particulate of the described surface with nanometer-size molecular, nanometer-size molecular can have achirality structure or chirality
Structure, such as antigen, antibody, enzyme, hormone, amine, peptides, amino acid, vitamin etc..
Described topological insulator substrate flat board, topological insulator realized by Material growth technique, including magnetron sputtering,
Electron beam evaporation, metallo-organic compound chemical gaseous phase deposition, vapor phase epitaxial growth, molecular beam epitaxy etc..
Described topological insulator substrate flat board, can be by modes such as illumination, energization, heating, pressurization and externally-applied magnetic fields
Realize that topological insulator is non-mediocre to topological mediocre reversible quantum phase transitions from topology.
Present system is made up of light source, microscope and optical force display.First topological insulator substrate is put down before test
Plate is placed in the sample cell bottom equipped with water or oil, and then the particulate by surface with nanometer-size molecular is placed in equipped with water or oil
In sample cell, while being placed in topological insulator substrate flat board top, plane of linear polarization wave source is entered from the side wall of sample cell, shone
Particulate is penetrated, because the Poynting vector that topological insulator substrate flat board is destroyed around particulate is symmetrical, is made total on particulate
Poynting vector is not zero, and produces non-gradient optical force；Then, by topological insulator in change topological insulator substrate flat board
Quantum state, change total Poynting vector distribution of topological insulator substrate flat board top microparticle surfaces, and then change total glass print
Booth vector acts on the direction of the non-gradient optical force on particulate and size to regulate and control motion rail of the particulate in incident field
Mark, so as to carry out tunable capture and screening to the nanometer-size molecular for being attached to microparticle surfaces.Microscope can be used to observe
The produced movement locus under incident light action of particulate of the surface with nanometer-size molecular.The microscope can adopt general
Logical fluorescence vertically or is just putting microscope.
The system can be realized to nano-scale achirality structural objects by simple plane of linear polarization light wave
Tunable capture and screening.Overcome and capture using gradient optics power and screen institute in nanometer-size molecular this conventional method
Incident light source complexity (i.e. incident light is necessary for circular polarization or elliptical polarization) that has, screening object limitation (i.e. nano-scale point
Son must have chirality), the gradient optics power that produced by circular polarization or elliptically polarized light is untunable and the nanometer that defies capture
The problems such as sized molecules, there is simple system, easy to operate, hypersensitive, supper-fast, actively tuning, can be used for biology,
The field such as medical science and nanometer manipulation.
Description of the drawings
Fig. 1 is particulate schematic diagram of the surface with nanometer-size molecular.
Fig. 2 is the capture of non-gradient optical force and screening produced by linearly polarized light in topological insulator substrate flat board top
Surface with nanometer-size molecular particulate process schematic.
Fig. 3 is the capture of non-gradient optical force and screening produced by linearly polarized light in topological insulator substrate flat board top
Surface with nanometer-size molecular particulate test system schematic diagram.
In figure：1 particulate, 2 nanometer-size moleculars, 3 topological insulator substrate flat boards, 4 light sources, 5 microscopes, 6 optical forces show
Show device, 7 sample cells, 8 thermostats, 9 ccd video cameras, 10 monitors, 11 computers, 12 video recorders.
Specific embodiment
Content to cause technical scheme becomes apparent from, and below in conjunction with technical scheme and accompanying drawing this is described in detail
The specific embodiment of invention.Material growth technology therein includes：Magnetron sputtering, electron beam evaporation, metallo-organic compound
The common technologies such as chemical gaseous phase deposition, vapor phase epitaxial growth, and molecular beam epitaxy technique.
Embodiment 1
First, particulate 1 is produced by Material growth technique, such as shown in accompanying drawing 1 (a).The wherein geometry and chi of particulate
It is very little to be determined using finite time-domain calculus of finite differences, FInite Element scheduling algorithm.
Secondly, nanometer-size molecular 2 is adhered in the outer surface of particulate 1, such as shown in accompanying drawing 1 (b).
Then, the particulate 1 of surface attachment nanometer-size molecular 2 is placed in into the surface of topological insulator substrate flat board 3, away from
From for l (l>0), when incident light be plane of linear polarization ripple and topological insulator substrate flat board 3 for topological non-mediocre body when, in opening up
The Poynting vector flutterred around the particulate 1 of the top of insulator substrates flat board 3 is the total Poynting on asymmetric distribution, i.e. particulate 1
Vector is not zero, and produces the non-gradient optical force that right front is pointed to along incident light direction, makes particulate 1 before the right side of incident light direction
Fang Yundong, and then drive the nanometer-size molecular 2 for being attached to the surface of particulate 1 to move along the right front of incident light direction, such as accompanying drawing 2
Shown in (a).
Afterwards, by mode opening up topological insulator substrate flat board 3 such as illumination, energization, heating, pressurization and externally-applied magnetic fields
Flutter non-mediocre body and be converted into (i.e. quantum state change of the topological insulator generation from the non-mediocrity of topology to topological mediocrity of topological mediocre body
Change), the total Poynting vector direction and size for making the surface of particulate 1 changes, and produces and points to left front along incident light direction
Non-gradient optical force, makes particulate 1 drive the nanometer-size molecular 2 for being attached to its surface to move along the left front of incident light direction,
As shown in accompanying drawing 2 (b).
Finally, topological insulator substrate flat board 3 is made to become topology again by topological mediocrity body by modes such as cooling, illumination non-flat
Mediocre body (i.e. topological insulator is produced from the topological mediocre quantum state change to the non-mediocrity of topology), the non-ladder that now particulate 1 is subject to
Degree optical force has become the non-gradient optical force that right front is pointed to along incident light direction again again, and particulate 1 drives the edge of nanometer-size molecular 2
The right front motion of incident light direction, such as shown in accompanying drawing 2 (c).
So we are controlled particulate 1 and are being entered by the quantum state of topological insulator in change topological insulator substrate flat board 3
The movement locus penetrated in light field, finally realizes tunable capture and the sieve of nanometer-size molecular 2 to being attached to the surface of particulate 1
Choosing.
Present system is mainly made up of light source 4, microscope 5 and optical force display 6.First by topological insulator before test
Substrate flat board 3 is placed in the bottom of the sample cell 7 equipped with water or oil, is then placed in the particulate 1 of surface attachment nanometer-size molecular 2
In sample cell 7, and it is placed in the top of topological insulator substrate flat board 3.Light source 4 produces side wall of the plane of linear polarization ripple from sample cell 7
Into horizontal irradiation particulate 1 realizes arresting and manipulating for the particulate 1 to surface attachment nanometer-size molecular 2.Microscope 5 can be with
For the produced movement locus under incident light action of the particulate 1 for observing micro- surface attachment nanometer-size molecular 2.Linear polarization is put down
Face ripple is measured in the non-gradient optical force that the particulate 1 of surface attachment nanometer-size molecular 2 is produced by optical force display 6.This
Bright system also includes (shown in accompanying drawings 3) such as thermostat 8, ccd video camera 9, monitor 10, computer 11 and video recorders 12 simultaneously.
Real-time monitoring is carried out to the particulate 1 of the surface attachment nanometer-size molecular 2 under the irradiation of plane of linear polarization ripple using ccd video camera 9,
And show the vision signal of gained in display.Video recorder 12 can be used to record image.Sample cell 7 is connected with thermostat 8,
The quantum state of the topological insulator in topological insulator substrate flat board 3 changes with the temperature change of sample cell 7.Computer 11 can
To store the field-of-view information that microscope 5 is gathered.
The above is the know-why and instantiation of present invention application, according to the equivalent change that the conception of the present invention is done
Change, if its scheme for being used still without departing from specification and drawings covered it is spiritual when, all should within the scope of the invention,
Illustrate hereby.
Claims (8)
1. a kind of plane of linear polarization light wave in topological insulator substrate top particulate tunable capture and screening method,
Characterized in that, particulate is placed in into topological insulator substrate flat board top, the topological insulator substrate flat board destroys particulate week
The Poynting vector for enclosing is symmetrical, makes the total Poynting vector on particulate be not zero, and produces non-gradient optical force；By changing
The quantum state of topological insulator substrate flat board, changes the total Poynting vector distribution on particulate, and then changes total Poynting vector
Act on the non-gradient optical force on particulate direction and size regulating and controlling movement locus of the particulate in incident field, so as to
Nanometer-size molecular to being attached to microparticle surfaces carries out tunable capture and screening, wherein, particulate is placed in topological insulator lining
Base plate top, microparticle material is medium or metal, the length of topological insulator substrate at 10 nanometers to 10 meters, particulate with
The distance of topological insulator substrate planar surface is l, l>0；The profile of particulate is surface geometry body or polyhedron, and volume is vertical 1
Square nanometer is to 1000 cu μ ms.
2. method according to claim 1, it is characterised in that incident light is plane of linear polarization ripple；Incident light beam strikes direction
Parallel to topological insulator substrate flat board, wave-length coverage is 0.3 micron～20 microns, and power bracket is 0.1mW/ μm2～10mW/
μm2。
3. method according to claim 1 and 2, it is characterised in that the light source of incident light using Wavelength tunable laser,
Semiconductor is continuous or quasi-continuous lasing or light emitting diode.
4. method according to claim 3, it is characterised in that microparticle material is metal or medium, wherein, metal be Al,
Ag, Au, Cu, Ni or Pt, medium is Si, SiO2、GaAs、InP、Al2O3In one kind or polymer.
5. method according to claim 4, it is characterised in that topological insulator is BixSb1-x、HgTe、Bi2Te3、Bi2Se3
Or Sb2Te3。
6. the method according to claim 1 or 2 or 4 or 5, it is characterised in that nanometer-size molecular has achirality structure
Or chiral structure.
7. the method according to claim 1 or 2 or 4 or 5, it is characterised in that topological insulator passes through Material growth technique
Realize, including magnetron sputtering, electron beam evaporation, metallo-organic compound chemical gaseous phase deposition, vapor phase epitaxial growth or molecular beam
Extension.
8. the method according to claim 1 or 2 or 4 or 5, it is characterised in that by illumination, energization, heating, pressurization or outer
Plus magnetic field realizes that topological insulator is non-mediocre to topological mediocre reversible quantum phase transitions from topology.
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| CN102745643A (en) * | 2011-04-19 | 2012-10-24 | 金石琦 | Laser tweezers device |
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| CN103676126A (en) * | 2013-12-20 | 2014-03-26 | 同济大学 | Operation instrument for optical tweezers |
| CN103885119A (en) * | 2014-03-20 | 2014-06-25 | 河海大学常州校区 | Method for manufacturing tunable photonic crystal and tunable photonic crystal |
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