CN105118541B - Tunable capturing and screening method of linear polarization planar optical waves for particle located above chalcogenide substrate - Google Patents
Tunable capturing and screening method of linear polarization planar optical waves for particle located above chalcogenide substrate Download PDFInfo
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- CN105118541B CN105118541B CN201510428884.5A CN201510428884A CN105118541B CN 105118541 B CN105118541 B CN 105118541B CN 201510428884 A CN201510428884 A CN 201510428884A CN 105118541 B CN105118541 B CN 105118541B
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Abstract
The invention provides a tunable capturing and screening method of linear polarization planar optical waves for a particle located above a chalcogenide substrate. The technical scheme of the tunable capturing and screening method comprises the steps of arranging the particle above a chalcogenide substrate plate, damaging symmetrical distribution of Poynting vectors around the particle, enabling the total Poynting vector on the particle not to be zero, and generating a non-gradient optical force; then changing the direction and the size of the total Poynting vector on the particle through charging the lattice structure of the chalcogenide substrate plate, thus changing the direction and the size of the non-gradient optical force acted on the particle by the total Poynting vector so as to regulate and control a movement track of the particle in an incident field, thereby carrying out tunable capturing and screening on nano-sized molecules attached to the surface of the particle. The lattice structure of the chalcogenide substrate plate can be changed through the modes of illumination, electrification, heating, pressurization and the like.
Description
Technical field
The present invention relates to a kind of plane of linear polarization light wave to the tunable capture of the microgranule above the chalkogenide substrate and
The method of screening, can be applicable to the fields such as biology, medical science and nanometer manipulation.
Background technology
Optical acquisition and screening to small items is always the study hotspot of optical field.Optical gradient forces are in various light
Important role, the optical tweezer for example realized by optical gradient forces and optics binding etc. are play in learning capture technique.However, light
Learn gradient force and have the shortcomings that generation equipment is complicated, untunable and defies capture and screens nanometer-size molecular.2008,
Ward, T.J. etc. propose that the optical gradient forces produced by circularly polarized light can be captured 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 which is caught
Obtain and there must be 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 chalkogenide substrate flat board so as in plane of linear polarization light wave
Non-gradient optical force is produced around microgranule under irradiation；Then, using chalkogenide lattice structure with additional light field, electric field, temperature
The characteristic that degree field and pressure field change and change, tunes the non-gradient optical force that microgranule is subject to above chalkogenide substrate flat board
Size and Orientation, so as to realize the capture and screening of the nanometer-size molecular to being attached to microparticle surfaces, wherein nano-scale point
Son can be achirality structure.
The content of the invention
It is an object of the invention to overcome
Incident light source complexity (i.e. incident illumination is necessarily circular polarization or elliptical polarization) that has in method, screening object limitation (i.e. nanometer
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 chalkogenide substrate
The method of the achirality nanometer-size molecular above flat board, can be used for the fields such as biology, medical science and nanometer manipulation.
The technical scheme that solve problem of the present invention is adopted is as follows：
A kind of method of plane of linear polarization light wave to being in the tunable capture and screening of microgranule above chalkogenide substrate,
Microgranule is placed in above chalkogenide substrate flat board, the chalkogenide substrate flat board destroys the Poynting vector pair around microgranule
Claim distribution, make the total Poynting vector on microgranule be not zero, produce non-gradient optical force；By changing chalkogenide substrate flat board
Chalkogenide lattice structure, change the total Poynting vector distribution on microgranule, so change total Poynting vector act on it is micro-
The direction of the non-gradient optical force on grain and size, regulate and control movement locus of the microgranule in incident field, so as to being attached to
The nanometer-size molecular of microparticle surfaces carries out tunable capture and screening, wherein, microgranule is placed in above chalkogenide substrate flat board,
Microparticle material can be medium or metal, the length of chalkogenide substrate at 10 nanometers to 10 meters, microgranule and chalkogenide
The distance of substrate planar surface is l (l>0)；The profile of microgranule can be the surface geometry such as spheroid, cylinder, cone body or rib
The polyhedrons such as cylinder, square, cuboid, volume is in 1 cubic nanometer to 1000 cu μ ms.
Incident illumination according to claim 1, incident illumination are plane of linear polarization ripple；Incident illumination is oriented parallel to chalcogenide
Thing substrate flat board, frequency range are 0.3 micron～20 microns, and power bracket is 0.1mW/ μm2～10mW/ μm2。
The light source of described incident illumination is using Wavelength tunable laser, continuous quasiconductor or quasi-continuous lasing or sends out
Optical diode.
Microgranule 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 chalkogenide substrate flat board, chalkogenide can be GeTe, Ge2Sb2Te5, Ge1Sb2Te4, Ge2Sb2Te4,
Ge3Sb4Te8, Ge15Sb85, Ag5In6Sb59Te30。
Microgranule 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, aminoacid, vitamin etc..
Described chalkogenide substrate flat board, chalkogenide is realized by Material growth technique, including magnetron sputtering, electronics
Beam evaporation, metallo-organic compound chemical gaseous phase deposition, vapor phase epitaxial growth, molecular beam epitaxy etc..
Described chalkogenide substrate flat board, can change chalkogenide by modes such as illumination, energization, heating and pressurizations
Lattice structure.
Present system is made up of light source, microscope and optical force display.First by chalkogenide substrate flat board before test
The sample cell bottom equipped with water or oil is placed in, then the microgranule by surface with nanometer-size molecular is placed in the sample equipped with water or oil
In product pond, while being placed in above chalkogenide substrate flat board, plane of linear polarization wave source is entered from the side wall of sample cell, is irradiated micro-
Grain, as the Poynting vector that chalkogenide substrate flat board is destroyed around microgranule is symmetrical, makes the total Poynting on microgranule
Vector is not zero, and produces non-gradient optical force；By the lattice structure for changing chalkogenide, change on chalkogenide substrate flat board
Total Poynting vector distribution of square microparticle surfaces, and then the total Poynting vector of change acts on the non-gradient optical force on microgranule
Direction and size, regulate and control movement locus of the microgranule in incident field, so as to the nano-scale point to being attached to microparticle surfaces
Son carries out tunable capture and screening.Microscope can be used to observe microgranule of the surface with nanometer-size molecular in incident illumination work
With lower produced movement locus.The microscope can be vertical using common fluorescent or 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
Incident light source complexity (i.e. incident illumination 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 microgranule schematic diagram of the surface with nanometer-size molecular.
Fig. 2 is the capture of non-gradient optical force and screening produced by line polarized light above chalkogenide substrate flat board
The process schematic of microgranule of the surface with nanometer-size molecular.
Fig. 3 is the capture of non-gradient optical force and screening produced by line polarized light above chalkogenide substrate flat board
The test system schematic diagram of microgranule of the surface with nanometer-size molecular.
In figure：1 microgranule, 2 nanometer-size moleculars, 3 chalkogenide substrate flat boards, 4 light sources, 5 microscopes, 6 optical forces show
Device, 7 sample cells, 8 thermostats, 9 ccd video cameras, 10 monitors, 11 computers, 12 videocorders.
Specific embodiment
Content to cause technical scheme becomes apparent from, and describes this in detail below in conjunction with technical scheme and accompanying drawing
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, microgranule 1 is produced by Material growth technique, such as shown in accompanying drawing 1 (a).The wherein geometry and chi of microgranule
It is very little to be determined using finite time-domain calculus of finite differences, FInite Element scheduling algorithm.
Secondly, adhere to nanometer-size molecular 2 in 1 outer surface of microgranule, such as shown in accompanying drawing 1 (b).
Then, the microgranule 1 of surface attachment nanometer-size molecular 2 is placed in into 3 surface of chalkogenide substrate flat board, distance
For l (l>0), when incident illumination is plane of linear polarization ripple and chalkogenide substrate flat board 3 is non-crystalline, serve as a contrast in chalkogenide
The Poynting vector around microgranule 1 above base plate 3 is that the total Poynting vector on asymmetric distribution, i.e. microgranule 1 is not zero,
The non-gradient optical force that right front is pointed to along incident light direction is produced, microgranule 1 is moved along the right front of incident light direction, and then
Drive is attached to the nanometer-size molecular 2 on 1 surface of microgranule and moves along the right front of incident light direction, such as shown in accompanying drawing 2 (a).
Afterwards, the non-crystalline of chalkogenide substrate flat board 3 is converted by modes such as illumination, energization, heating and pressurizations
For crystalline state, the total Poynting vector direction and size for making 1 surface of microgranule changes, produces left front along incident light direction sensing
The non-gradient optical force of side, makes microgranule 1 drive the nanometer-size molecular 2 for being attached to its surface to transport along the left front of incident light direction
It is dynamic, such as shown in accompanying drawing 2 (b).
Finally, chalkogenide substrate flat board 3 is made to become non-crystalline again by crystalline state by modes such as cooling, illumination, now
The non-gradient optical force that microgranule 1 is subject to has become the non-gradient optical force that right front is pointed to along incident light direction again again, and microgranule 1 drives
Nanometer-size molecular 2 is moved along the right front of incident light direction, such as shown in accompanying drawing 2 (c).
So we control microgranule 1 in incidence by the lattice structure of chalkogenide in change chalkogenide substrate flat board 3
Movement locus in light field, finally realize tunable capture and the sieve of nanometer-size molecular 2 to being attached to 1 surface of microgranule
Choosing.
Present system is mainly made up of light source 4, microscope 5 and optical force display 6.First chalkogenide is served as a contrast before test
Base plate 3 is placed in the bottom of the sample cell 7 equipped with water or oil, and the microgranule 1 of surface attachment nanometer-size molecular 2 is placed in sample then
In product pond 7, and it is placed in above chalkogenide substrate flat board 3.Light source 4 produces plane of linear polarization ripple and enters from the side wall of sample cell 7,
Horizontal irradiation microgranule 1, realizes arresting and manipulating for the microgranule 1 to surface attachment nanometer-size molecular 2.Microscope 5 can be used to
Observe movement locus of the microgranule 1 of micro- surface attachment nanometer-size molecular 2 produced by under incident light action.Plane of linear polarization ripple
The non-gradient optical force produced in the microgranule 1 of surface attachment nanometer-size molecular 2 is measured by optical force display 6.Present invention system
System simultaneously also includes thermostat 8, ccd video camera 9, monitor 10, computer 11, and videocorder 12 etc. (shown in accompanying drawing 3).Utilize
Ccd video camera 9 carries out real-time monitoring to the microgranule 1 of the surface attachment nanometer-size molecular 2 under the irradiation of plane of linear polarization ripple, and will
The video signal of gained is shown in display.Videocorder 12 can be used to record image.Sample cell 7 is connected with thermostat 8, sulfur family
The lattice structure of the chalkogenide in compound substrate flat board 3 changes with the temperature change of sample cell 7.Computer 11 can be stored
The field-of-view information gathered by microscope 5.
The above is the know-why and instantiation of present invention application, according to the equivalent change done by the conception of the present invention
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. method of a kind of plane of linear polarization light wave to the tunable capture and screening of the microgranule above the chalkogenide substrate, its
It is characterised by, microgranule is placed in above chalkogenide substrate flat board, and the chalkogenide substrate flat board destroys the glass around microgranule
Print booth vector is symmetrical, makes the total Poynting vector on microgranule be not zero, and produces non-gradient optical force；By changing chalcogenide
The chalkogenide lattice structure of thing substrate flat board, changes the total Poynting vector distribution on microgranule, and then changes total Poynting vector
Amount acts on the direction of the non-gradient optical force on microgranule and size, regulates and controls movement locus of the microgranule in incident field, from
And the nanometer-size molecular to being attached to microparticle surfaces carries out tunable capture and screening, wherein, microgranule is placed in chalkogenide lining
Above base plate, microparticle material is medium or metal, the length of chalkogenide substrate at 10 nanometers to 10 meters, microgranule and sulfur
The distance of race's compound substrate planar surface is l, l> 0；The profile of microgranule is surface geometry body or polyhedron, and volume is at 1 cube
Nanometer is to 1000 cu μ ms.
2. method according to claim 1, it is characterised in that incident illumination is plane of linear polarization ripple；Incident light beam strikes direction
Parallel to chalkogenide substrate flat board, frequency range is 0.3 micron ~ 20 microns, and power bracket is 0.1 mW/ μm2~10mW/μm2。
3. method according to claim 1 and 2, it is characterised in that the light source of described incident illumination adopts tunable wave length
Laser instrument, quasiconductor be 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 are Si, SiO2、GaAs、InP、Al2O3In one kind or polymer.
5. method according to claim 4, it is characterised in that chalkogenide is GeTe, Ge2Sb2Te5、 Ge1Sb2Te4、
Ge2Sb2Te4、Ge3Sb4Te8、Ge15Sb85Or Ag5In6Sb59Te30。
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 described chalkogenide substrate flat board, sulfur family
Compound realized by Material growth technique, including magnetron sputtering, electron beam evaporation, metallo-organic compound chemical gaseous phase deposition,
Vapor phase epitaxial growth or molecular beam epitaxy.
8. the method according to claim 1 or 2 or 4 or 5, it is characterised in that described chalkogenide substrate flat board, passes through
The lattice structure of illumination, energization, heating and pressurizing altered chalkogenide.
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