CN105118541A - 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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- CN105118541A CN105118541A CN201510428884.5A CN201510428884A CN105118541A CN 105118541 A CN105118541 A CN 105118541A CN 201510428884 A CN201510428884 A CN 201510428884A CN 105118541 A CN105118541 A CN 105118541A
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- chalkogenide
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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 method of catching and screening being in chalkogenide types of flexure particulate, 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 nanometer-size molecular be separated, because which limit the scope of its effective object.So the present invention proposes, being positioned at the covering of the microparticle surfaces above chalkogenide substrate flat board nanometer-size molecular, to make it produce non-gradient optical force around particulate under plane of linear polarization light-wave irradiation; Then, chalkogenide 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 above tuning chalkogenide substrate flat board, particulate is subject to, thus realize catching and screening the nanometer-size molecular being attached to microparticle surfaces, 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 the achirality nanometer-size molecular be positioned at above chalkogenide substrate flat board is caught and screened to the non-gradient optical force produced by plane of linear polarization light wave 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 plane of linear polarization light wave is to the tunable method of catching and screening being in chalkogenide types of flexure particulate, particulate is placed in above chalkogenide substrate flat board, the Poynting vector that this chalkogenide substrate flat board destroys around particulate is symmetrical, make the total Poynting vector on particulate non-vanishing, produce non-gradient optical force, by changing the chalkogenide crystalline network of chalkogenide substrate flat board, change the total Poynting vector distribution on particulate, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on particulate, regulate and control the movement locus of particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to microparticle surfaces, wherein, particulate is placed in above chalkogenide substrate flat board, microparticle material can be medium or metal, the length of chalkogenide substrate, wide, high in 10 nanometers to 10 meters, the distance of particulate and chalkogenide substrate planar surface is l (l>0), the profile of particulate can be the polyhedrons such as surface geometry body or prism, square, rectangular parallelepiped such as spheroid, right cylinder, cone, and volume is at 1 cubic nanometer to 1000 cu μ m.
Incident light according to claim 1, incident light is plane of linear polarization ripple; It is dull and stereotyped that incident light direction is parallel to chalkogenide substrate, and frequency range is 0.3 micron ~ 20 microns, and 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 particulate of nanometer-size molecular, and microparticle material can be metal or medium, and wherein, 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 chalkogenide substrate is dull and stereotyped, and chalkogenide can be GeTe, Ge
2sb
2te
5, Ge
1sb
2te
4, Ge
2sb
2te
4, Ge
3sb
4te
8, Ge
15sb
85, Ag
5in
6sb
59te
30.
Described surface is with the particulate 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 chalkogenide substrate is dull and stereotyped, and chalkogenide 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.
Described chalkogenide substrate is dull and stereotyped, can be changed the crystalline network of chalkogenide by modes such as illumination, energising, heating and pressurizations.
Present system is made up of light source, microscope and optical force display.First chalkogenide substrate flat board is placed in before test bottom the sample cell that water or oil are housed, then particulate surface being had nanometer-size molecular is placed in the sample cell that water or oil are housed, be placed in above chalkogenide substrate flat board simultaneously, plane of linear polarization wave source enters from the sidewall of sample cell, irradiate particulate, the Poynting vector destroyed around particulate due to chalkogenide substrate flat board is symmetrical, makes the total Poynting vector on particulate non-vanishing, produces non-gradient optical force; By changing the crystalline network of chalkogenide, change total Poynting vector distribution of microparticle surfaces above chalkogenide substrate flat board, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on particulate, regulate and control the movement locus of particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to microparticle surfaces.Microscope can be used for observing the surperficial movement locus produced under incident light effect with the particulate of nanometer-size molecular.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 plane of linear polarization light wave.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 nanometer-size molecular.
Fig. 2 is the process schematic that the non-gradient optical force produced by linearly polarized light caught and screened that the surface be in above chalkogenide substrate flat board has the particulate of nanometer-size molecular.
Fig. 3 is the test macro schematic diagram that the non-gradient optical force produced by linearly polarized light caught and screened that the surface be in above chalkogenide substrate flat board has the particulate of nanometer-size molecular.
In figure: 1 particulate, 2 nanometer-size molecular, 3 chalkogenide substrates are dull and stereotyped, 4 light sources, 5 microscopes, 6 optical force displays, 7 sample cells, 8 thermostats, 9CCD video camera, 10 monitors, 11 computing machines, 12 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, particulate 1 is produced, as shown in accompanying drawing 1 (a) by Material growth technique.Wherein particulate geometric configuration and size can adopt finite time-domain method of difference, finite element method scheduling algorithm is determined.
Secondly, at particulate 1 outside surface attachment nanometer-size molecular 2, as shown in accompanying drawing 1 (b).
Then, the particulate 1 of surface attachment nanometer-size molecular 2 is placed in dull and stereotyped 3 surfaces of chalkogenide substrate, distance is l (l>0), when incident light is plane of linear polarization ripple and chalkogenide substrate dull and stereotyped 3 is non-crystalline, the Poynting vector be in around the particulate 1 above chalkogenide substrate flat board 3 is asymmetric distribution, namely the total Poynting vector on particulate 1 is non-vanishing, produce the non-gradient optical force along sensing right front, incident light direction, particulate 1 is moved along the right front in incident light direction, and then drive the nanometer-size molecular 2 being attached to particulate 1 surface to move along the right front in incident light direction, as shown in accompanying drawing 2 (a).
Afterwards, by modes such as illumination, energising, heating and pressurizations, the non-crystalline of chalkogenide substrate flat board 3 is converted into crystalline state, total Poynting vector direction on particulate 1 surface and size are changed, produce the non-gradient optical force along sensing left front, incident light direction, particulate 1 is made to drive the nanometer-size molecular 2 being attached to its surface to move along the left front in incident light direction, 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, the non-gradient optical force that now particulate 1 is subject to has become again the non-gradient optical force along sensing right front, incident light direction again, particulate 1 drives nanometer-size molecular 2 to move along the right front in incident light direction, as shown in accompanying drawing 2 (c).
We are by changing the crystalline network of chalkogenide in chalkogenide substrate flat board 3 like this, control the movement locus of particulate 1 in incident field, finally achieve and catch the tunable of the nanometer-size molecular 2 being attached to particulate 1 surface and screen.
Present system is formed primarily of light source 4, microscope 5 and optical force display 6.First chalkogenide substrate flat board 3 is placed in the bottom of the sample cell 7 that water or oil are housed before test, then the particulate 1 of surface attachment nanometer-size molecular 2 is placed in sample cell 7, and be placed in above chalkogenide substrate flat board 3.Light source 4 produces plane of linear polarization ripple and enters from the sidewall of sample cell 7, horizontal irradiation particulate 1, realizes arresting and handling of the particulate 1 of effects on surface attachment nanometer-size molecular 2.Microscope 5 can be used for the movement locus observing the particulate 1 of micro-surface attachment nanometer-size molecular 2 produce under incident light effect.The non-gradient optical force that plane of linear polarization ripple produces at the particulate 1 of surface attachment nanometer-size molecular 2 is recorded by optical force display 6.Present system also comprises thermostat 8, ccd video camera 9, monitor 10, computing machine 11 and video recorder 12 etc. (shown in accompanying drawing 3) simultaneously.The particulate 1 of the surface attachment nanometer-size molecular 2 under utilizing ccd video camera 9 pairs of plane of linear polarization ripples to irradiate carries out Real-Time Monitoring, and the vision signal of gained is shown at display.Video recorder 12 can be used for recording image.Sample cell 7 is connected with thermostat 8, and the crystalline network of the chalkogenide in chalkogenide substrate flat board 3 changes with the temperature variation of sample cell 7.Computing machine 11 can store the visual field information that microscope 5 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 plane of linear polarization light wave is to the tunable method of catching and screening being in chalkogenide types of flexure particulate, it is characterized in that, particulate is placed in above chalkogenide substrate flat board, the Poynting vector that this chalkogenide substrate flat board destroys around particulate is symmetrical, make the total Poynting vector on particulate non-vanishing, produce non-gradient optical force, by changing the chalkogenide crystalline network of chalkogenide substrate flat board, change the total Poynting vector distribution on particulate, and then change direction and the size that total Poynting vector acts on the non-gradient optical force on particulate, regulate and control the movement locus of particulate in incident field, thus carry out tunablely catching and screening to the nanometer-size molecular being attached to microparticle surfaces, wherein, particulate is placed in above chalkogenide substrate flat board, microparticle material can be medium or metal, the length of chalkogenide substrate, wide, high in 10 nanometers to 10 meters, the distance of particulate and chalkogenide substrate planar surface is l, l>0, the profile of particulate is surface geometry body or polyhedron, 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 plane of linear polarization ripple; It is dull and stereotyped that incident light beam strikes direction is parallel to chalkogenide substrate, and frequency range is 0.3 micron ~ 20 microns, and 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, microparticle material is metal or medium, and wherein, metal is Al, Ag, Au, Cu, Ni, Pt etc., and medium is Si, SiO
2, GaAs, InP, Al
2o
3in one or polymkeric substance.
5. method according to claim 4, is characterized in that, chalkogenide is GeTe, Ge
2sb
2te
5, Ge
1sb
2te
4, Ge
2sb
2te
4, Ge
3sb
4te
8, Ge
15sb
85, Ag
5in
6sb
59te
30.
6. the method according to claim 1 or 2 or 4 or 5, it is characterized 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 characterized in that, described chalkogenide substrate is dull and stereotyped, and chalkogenide 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 or 2 or 4 or 5, is characterized in that, described chalkogenide substrate is dull and stereotyped, is changed the crystalline network of chalkogenide by modes such as illumination, energising, heating and pressurizations.
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