CN106908870A - A kind of incident optical coupled super lenses of surface plasma of zero degree - Google Patents
A kind of incident optical coupled super lenses of surface plasma of zero degree Download PDFInfo
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- CN106908870A CN106908870A CN201710310250.9A CN201710310250A CN106908870A CN 106908870 A CN106908870 A CN 106908870A CN 201710310250 A CN201710310250 A CN 201710310250A CN 106908870 A CN106908870 A CN 106908870A
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- optical
- surface plasma
- super lenses
- lens
- zero degree
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/008—Surface plasmon devices
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The present invention proposes a kind of incident surface plasma (SPR) optical coupling lens of zero degree, is made up of three optical surfaces：One surface topography is that the special optical of present invention design is aspherical, the face of cylinder that a height determines, a circular optical plane.The coupled lens, on axial symmetry in the normal direction for crossing optical flat center, are circle in the cross section parallel to optics of lens plane.The coupled lens are made up of high-index material, and directional light injects lens by optical aspherical surface side parallel to optical axis, through special optical aspheric refractive, focus on the surface geometry center of the circular optical plane of lens.When surface plasma metal material is plated on the optical flat of the coupled lens, excitating surface plasma at the plane surface geometric center of lens can be incident in the zero degree parallel to lens axis.The trigonometric expression mechanical framework that causes present invention effectively prevents the large angle incidence of SPR prism-coupled systems is complicated, aberration is big, the low problem of accuracy of detection.
Description
Technical field
It is optical coupled super the present invention relates to optical technical field, more particularly to a kind of incident surface plasma of zero degree
Lens.
Background technology
Surface plasma (Surface Plasmon Resonance, SPR) is uploaded in metal and dielectric interface
A kind of surface electromagnetic wave broadcast, the electric-field intensity in metal/dielectric interface is maximum and is being in the normal direction at interface
Exponential damping.The wave vector of surface plasma wave is generally needed by means of it more than the light wave vector under vacuum condition
His means realize the matching of wave vector so as to excite the SPR, conventional coupling process to have prism-coupled, waveguide coupling, grating to couple
Deng.In prism-coupled system, because SPR only can just be excited under specific incidence angle, widely used at present is trigonometric expression
Mechanical framework come match SPR excite angle and the detection through the reflected light after prism, i.e. illumination path and detection light path all with method
At an angle, the mechanical framework complexity of whole system, realization difficulty, prism are not a kind of preferable image optics components to line
The aberration for causing is larger, high to optical-mechanical-electrical control requirement cost higher, SPR instruments, and is difficult to and adopts mostly
It is compatible with the incident normal optical characterization technique of normal direction zero degree.The present invention proposes a kind of incident SPR optics couplings of zero degree
Super lenses are closed, can realize that the SPR under zero degree incidence is excited and detected, eliminating must use wanting for triangle mechanical framework
Ask, Mechatronic Systems control is greatly simplified, cost reduces and can be easily compatible with other optical technologies.
The content of the invention
(1) technical problem to be solved
What widely used glass prism SPR coupled system generally matched SPR using trigonometric expression mechanical framework at present excites angle
With the detection through the reflected light after prism, i.e. illumination path and detection light path all with the normal structure of prism hypotenuse/facet surfaces at an angle,
The mechanical framework of whole system is complicated, realize complicated, aberration big (prism is not a kind of preferable image optics component), to light
Electromechanical control cost higher, SPR instruments remains high, and is difficult to more than others using the normal of normal direction zero degree incidence
Rule optical characterisation technical compatibility.To solve this problem, to propose a kind of incident SPR of zero degree optical coupled super for the present invention
Mirror.
(2) technical scheme
The present invention proposes a kind of surface plasma super lenses of high-NA, is made up of three optical surfaces, a table
Face pattern is that the special optical of present invention design is aspherical, and a surface is circular optical plane, a circle determined for height
Cylinder.The 3D shape of super lenses is symmetrical, and optical axis intersects at center parallel to incident parallel light and with optical flat.
High-NA surface plasma super lenses of the invention are using the high-index material group to visible transparent
Into, directional light by aspheric entry to plasma super lenses, by after unirefringence, focusing on optical flat center, so that
The SPR of sample is excited, testing goal is reached.
The curve of aspheric surface plasma super lenses is obtained by the recurrence formula for designing, with hump as origin, summit
Tangent line sets up plane right-angle coordinate for x-axis, and the curve of plasma super lenses is divided into m parts, and each point is set to (xi(m),yi
(m)), corresponding surface normal is with the angle of incident lightAperture semi-angle is divided into 2m-1 parts, is set to θ (m), wait from
Daughter super lenses refractive index n, h are distance of the aspheric curve summit to its equatorial plane, and f highly, then has for the face of cylinder
Wherein,
Y (m)=- x (m) * cot [θ (2m-2)]+h+f*tan [θ (2m-2)] * cot [θ (2m-2)]
X (1)=0 y (1)=0 yalt(1)=0
X (2)=h*tan [β (2)]+f*tan [θ (2)] y (2)=0 yalt(2)=0
Above-mentioned technical proposal of the invention has the following advantages：
1. the high numerical aperture similar with oil immersion or admittedly leaching microcobjective can be realized using oil immersion simple lens of exempting from of the invention
Footpath characteristic；
2. surface plasma super lenses proposed by the present invention have low excellent without spherical aberration, small volume, simple structure, cost
Point；
3. can realize that the SPR under zero degree incidence is excited and detected, eliminating must use wanting for triangle mechanical framework
Ask, Mechatronic Systems control is greatly simplified, cost reduces and can be easily compatible with other optical technologies；
4. the SPR couplings detecting system based on the optical coupled super lenses of surface plasma of the invention has aberration small,
The advantages of accuracy of detection is high；
5. when directional light along lens axis zero degree incide lens it is aspherical when, surface plasma of the invention surpass
Lens can produce the wide-angle scope from zero degree to maximum diameter of hole half-angle under two-dimentional yardstick, can not only be in two-dimentional yardstick
Under excite in smaller local scope SPR to be detected so as to the sample to smaller local, and be obtained in that the SPR of two dimension absorbs
Spectrum is so as to more precisely be identified and detect.
General principle of the invention and principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Brief description of the drawings
Fig. 1 is the refraction schematic diagram of the incident optical coupled super lenses of surface plasma of zero degree；
Fig. 2 is the three-dimensional geometry figure of the optical coupled super lenses of surface plasma；
Fig. 3 is focused view of the optical coupled super lenses of surface plasma on testing sample surface；
Fig. 4 is the application system figure of the optical coupled super lenses of surface plasma；
Wherein：∠ OCG=θ (2m-4) in Fig. 1, ∠ OCA=θ (2m-2), ∠ OCD=θ (2m-3), G (xi(m-1),yi(m-
1)),A(xi(m),yi(m)),B point ordinates yialt(m)；
In Fig. 3, incident light is directional light；401 is the optical coupled super lenses of surface plasma, and 402 is gold, and 403 is to treat
Test sample product；
1 is illuminator in Fig. 4, and 2 is detection system, and 3 is spectroscope, and 401 is that surface plasma is optical coupled super
Mirror, 402 is surface plasma metallic film, and 403 is testing sample.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the invention is described in further detail.Following instance
For illustrating the present invention, but it is not limited to the scope of the present invention.
Specific embodiment one：It is optical coupled super the invention provides a kind of incident surface plasma of zero degree
Mirror, can be applied to the coupling and detection of surface plasma.Specific embodiment is illustrated with reference to Fig. 1,3,4, it is of the present invention
A kind of optical coupled super lenses of high-NA surface plasma, be made up of three optical surfaces, one of pattern for this
Special aspherical, the face of cylinder determined for height of invention design, one is optical flat, and it is shaped as circle.
The invention provides a kind of incident optical coupled super lenses of surface plasma of zero degree, surface can be applied to
The coupling and detection of plasma.System includes：
Refractive index is the optical coupled super lenses of surface plasma of n, surface plasma sensing chip, testing sample.
Slide is placed on aspherical equator facial plane, and super lenses device can reach the effective of NA=nsin α
Numerical aperture, wherein n are surface plasma super lenses refractive index, surface plasma super lenses energy when α is incident directional light
Enough maximum diameter of hole half-angles for providing.
Special aspherical sectional view by origin of O as shown in figure 1, with OC as Y-axis, with vertical OC directions as X-axis, set up
Rectangular coordinate system.It is m parts that the curve of plasma super lenses is graded, and each point is set to (xi(m),yi(m)), corresponding curved surface
Normal is φ (2m-2) with the angle of incident light, and aperture semi-angle is divided into 2m-1 parts, is set to θ (m), plasma super lenses refractive index
N, h are distance of the particular design hump to its diameter, and f highly, then has for the face of cylinder
Wherein,
Y (m)=- x (m) * cot [θ (2m-2)]+h+f*tan [θ (2m-2)] * cot [θ (2m-2)]
X (1)=0 y (1)=0 yalt(1)=0
X (2)=h*tan [β (2)]+f*tan [θ (2)] y (2)=0 yalt(2)=0
Specific embodiment two：A kind of optical coupled super lenses, its structure is applied to as described in claim one
When in surface plasma Systems for optical inspection as shown in Figure 4, its characteristic is as follows：
System by illuminator (1), detection system (2), spectroscope (3), plasma super lenses (401), surface etc. from
Daughter sensing chip (402), testing sample (403) composition.
Surface plasma sensing chip (402) is placed on the optical flat of the optical coupled super lenses of surface plasma,
Testing sample (403) is placed on surface plasma sensing chip.
After spectroscopical light splitting, zero degree incides surface plasma bulk optics coupling to the light beam that illuminator (1) sends
When closing super lenses, by aspherical unirefringence, the optics of the optical coupled super lenses of surface plasma is focused the beam onto
Planar central.The numerical aperture of the optical coupled super lenses of surface plasma depends on the aspherical pattern of super lenses and is used
Lens material refractive index, as SPR of the maximum diameter of hole half-angle corresponding to numerical aperture more than testing sample and sensing chip
When exciting angle, SPR, and focus point can be inspired much smaller than conventional prism in testing sample and gold nanometer film interface
The focus point of formula SPR activating systems such that it is able to realize the high resolution detection of the testing sample under smaller yardstick.After exciting
Light is returned along former incident path, into detecting system, SPR absorption spectras can be shown on the back focal plane of super lenses, by SPR
Absorption spectra carries out signature analysis, you can realize the Precision measurement of testing sample.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (6)
1. a kind of incident optical coupled super lenses of surface plasma of zero degree, are made up of, a surface shape three optical surfaces
Looks are that the special optical of present invention design is aspherical, and one is circular optical plane, the face of cylinder determined for height.
2. a kind of incident optical coupled super lenses of surface plasma of zero degree according to claim 1, its feature exists
In the optical coupled super lenses are symmetrical on its own circular flat central axis, in the horizontal stroke parallel to optics of lens plane
Section is circle.
3. a kind of incident optical coupled super lenses of surface plasma of zero degree according to claim 1, its feature exists
In the optical coupled super lenses of surface plasma are made up of the solid-state high-index material to visible transparent.
4. a kind of incident optical coupled super lenses of surface plasma of zero degree according to claim 1, its feature exists
In when directional light is by the incidence of optical aspherical surface side, the light by that can focus on surface plasma super lenses after unirefringence
Learn the surface geometry center of plane.
5. a kind of incident optical coupled super lenses of surface plasma of zero degree according to claim 1, Effective Numerical
Aperture is NA=nsin α, and wherein n is surface plasma super lenses refractive index, surface plasma when α is incident directional light
The maximum diameter of hole half-angle that super lenses can be provided.
6. incident optical coupled super lenses of surface plasma of a kind of zero degree according to claim 1, it is along optical axis
Section is given by recurrence formula, and with hump as origin, vertex tangent sets up plane right-angle coordinate for x-axis, by plasma
The curve of body super lenses is divided into m parts, and each point is (xi(m),yi(m)), corresponding surface normal is with the angle of incident lightAperture semi-angle is divided into 2m-1 parts and is respectively θ (m), and plasma optics coupling super lenses refractive index n, h are aspheric
The summit of surface curve to its equatorial plane distance, f be the face of cylinder highly：
Wherein,
Y (m)=- x (m) * cot [θ (2m-2)]+h+f*tan [θ (2m-2)] * cot [θ (2m-2)]
X (1)=0 y (1)=0 yalt(1)=0
X (2)=h*tan [β (2)]+f*tan [θ (2)] y (2)=0 yalt(2)=0
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| CN201710310250.9A CN106908870B (en) | 2017-05-05 | 2017-05-05 | A kind of optical coupled super lens of surface plasma of zero degree incidence |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0305109A1 (en) * | 1987-08-22 | 1989-03-01 | AMERSHAM INTERNATIONAL plc | Biological sensors |
| US20050232121A1 (en) * | 2004-03-31 | 2005-10-20 | Kenji Konno | Refracting objective optical system and optical recording/reproducing device using the same |
| CN101477046A (en) * | 2009-01-09 | 2009-07-08 | 清华大学 | Cell layer detection method and system based on surface plasma resonance sensing |
| CN106645083A (en) * | 2016-11-18 | 2017-05-10 | 吉林大学 | Excitation angle variable integrated plasma enhanced Raman spectrum detection device |
-
2017
- 2017-05-05 CN CN201710310250.9A patent/CN106908870B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0305109A1 (en) * | 1987-08-22 | 1989-03-01 | AMERSHAM INTERNATIONAL plc | Biological sensors |
| US20050232121A1 (en) * | 2004-03-31 | 2005-10-20 | Kenji Konno | Refracting objective optical system and optical recording/reproducing device using the same |
| CN101477046A (en) * | 2009-01-09 | 2009-07-08 | 清华大学 | Cell layer detection method and system based on surface plasma resonance sensing |
| CN106645083A (en) * | 2016-11-18 | 2017-05-10 | 吉林大学 | Excitation angle variable integrated plasma enhanced Raman spectrum detection device |
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