CN109799209A - A kind of simplification glass prism SPR excitation apparatus based on parabolic reflector - Google Patents
A kind of simplification glass prism SPR excitation apparatus based on parabolic reflector Download PDFInfo
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- CN109799209A CN109799209A CN201910093814.7A CN201910093814A CN109799209A CN 109799209 A CN109799209 A CN 109799209A CN 201910093814 A CN201910093814 A CN 201910093814A CN 109799209 A CN109799209 A CN 109799209A
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- 230000005284 excitation Effects 0.000 title claims abstract description 9
- 239000011521 glass Substances 0.000 title description 4
- 239000002184 metal Substances 0.000 claims abstract description 13
- 230000010287 polarization Effects 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 claims description 5
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 2
- 240000002853 Nelumbo nucifera Species 0.000 claims description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000004544 sputter deposition Methods 0.000 claims 1
- 238000007740 vapor deposition Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 239000003574 free electron Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
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- 241000135164 Timea Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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Abstract
The invention discloses a kind of prism excitation apparatus for simplifying surface plasma body resonant vibration (Surface Plasmon Resonance, SPR) using parabolic reflector, are related to Optical System Design field more particularly to surface plasma design field.Entire excitation apparatus includes polarization laser light source, parabolic reflector, optical path prism system and Charge-coupled Device Detector (CCD).The light that polarized light source issues is reflected on prism by parabolic mirror, the thin metal layer that can excite SPR is deposited in prism bases, when meeting SPR shooting condition, incident light is converted into SPR wave, incident laser energy is changed into the Joule heat of metal, it changes so as to cause prismatic reflection luminous intensity, the reflective light intensity of prism is detected by array or large area array CCD.Present invention greatly reduces the complexity of traditional SPR angle modulation device, it is changed to simply move up and down polarized light source from traditional rotating prism or rotatory polarization light source to realize angle modulated, it is referred to the graduation position that polarized light source moves up and down, the relationship of SPR resonance angle Yu polarized light source upright position can be released in conjunction with parabolic curve equation.
Description
Technical field
The present invention relates to surface plasmon optical design arts, and in particular to a kind of to simplify table using parabolic reflector
The prism excitation apparatus of surface plasma resonance (Surface Plasmon Resonance, SPR).
Background technique
It is well known that it is critical to be greater than total reflection in incident angle when light is incident on the prism surface for being coated with thin metal layer
When angle, light can be totally reflected, to cause evanescent waves in prism surface.The evanescent waves and metal surface free electron of generation
Oscillation couples, that is, so-called surface plasma body resonant vibration (SPR) occurs.Due to the high constraint and high loss of SPR propagating wave
Characteristic, SPR wave will not be further coupled to prism, so that a trough occurs in reflectance spectrum.Since SPR mode characteristic is to external environment
Change it is very sensitive, so spectrum trough can move when metallic film topical substance characteristic changes, therefore, people
The reactions change of detection external substance can be deduced by the mobile size of spectrum trough.
In recent years, the research of the spr sensor based on prism-coupled is always a heat subject, sensing detection performance ten
It is point superior, but since angle modulated needs rotating prism or laser, cause device volume big, measure complicated for operation and valence
A series of disadvantages such as lattice valuableness.For example, a kind of reported high-performance SPR object refractive index sensing device [is shown in Chinese patent
CN206223648U] and multichannel angle modulated type spr sensor detection system without movable member [see Chinese patent
CN203132991U].In patent CN203132991U, although not needing to carry out angle modulated, multiple groups optical lens is increased,
Therefore there is very harsh requirement to the tightness and accuracy of optical path.
Summary of the invention
The present invention proposes to improve angular adjustment using parabolic reflector in line with glass prism SPR sensing device purpose is simplified
Operating flexibility, to change the mode of conventional angle modulation, it is simple to have a manufacture craft, operating flexibility it is high and low at
This advantages that.To achieve the above object, the present invention provides the following technical solutions realization.
It is a kind of using parabolic reflector simplify surface plasma body resonant vibration prism excitation apparatus include: polarization laser light
Source (1), parabolic mirror (2), prism (3), metallic film (4), Charge-coupled Device Detector CCD(5), bracket (6).Such as
Shown in Fig. 1, the light that polarization laser light source 1 issues is reflected on prism 3 by parabolic mirror 2, and 3 bottom surface of prism is vapor-deposited with energy
The thin metal layer 4 for enough exciting SPR, when meeting SPR shooting condition, incident light is converted into SPR mode, i.e. incident laser energy changes
It for the Joule heat of metal, changes so as to cause 3 intensity of reflected light of prism, 3 reflective light intensity of prism is by array or large area array electricity
Lotus coupled device detector (CCD) 5 detects, and polarized light source 1 and CCD 5 are installed on bracket 6, and can move up and down position.
Light source (1) is the polarized light source that can move up and down in the present invention, by moving up and down light source, it can be achieved that angle tune
System, has higher operating flexibility.
Reflecting mirror (2) is that collimated light beam focusing is reflexed to prism using the purpose of parabolic reflector in the present invention, from
And traditional rotating prism or light source are changed to the more easy light source that moves up and down, increase the flexibility of measurement operation.
Prism (3) must be placed on the focal point of parabolic mirror in the present invention, with guarantee light source when moving up and down,
The light focusing that light source issues can be irradiated on the bottom surface of prism, while greatly reduce the position excursion of incidence point.
Present invention greatly reduces the complexity of traditional SPR angle modulation device, by traditional rotating prism or polarization
Light source is changed to neatly move up and down polarized light source to realize that angle modulated, the present invention can move up and down quarter according to polarized light source
The position coordinates of degree refer to, and the relationship of SPR resonance angle and polarized light source upright position is released in conjunction with parabolic curve equation.
Detailed description of the invention
Fig. 1 is the surface plasma prism excitation apparatus based on parabolic reflector.
Fig. 2 is device entirety paths schematic diagram.
Fig. 3 is prism paths schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention is into completely retouching
It states.
Such as Fig. 1, simplification glass prism SPR excitation apparatus proposed by the invention includes: polarization laser light source (1), and paraboloid is anti-
Penetrate mirror (2), prism (3), metallic film (4), Charge-coupled Device Detector CCD(5), bracket 6.Polarization laser light source 1 issues
Light be reflected on prism 3 by parabolic mirror 2,3 bottom surface of prism is vapor-deposited with the thin metal layer 4 that can excite SPR, when full
When sufficient SPR shooting condition, incident light is converted into SPR mode, i.e. the incident laser energy Joule heat that is changed into metal, so as to cause rib
3 intensity of reflected light of mirror changes, and the reflective light intensity of prism 3 is detected by array or large area array CCD 5.
Working principle of the present invention: the light of polarized light source transmitting reflexes to bottom surface by parabolic mirror and is coated with thin metal layer
Prism on, change incident angle size by adjusting moving up and down for polarized light source, when incidence angle is a certain special angle
When, the free electron that light wave is vibrated with metal film surfaces resonates, and light wave is converted to SPR wave, at this point, CCD is just detected
The change of prismatic reflection light intensity.In addition, the position coordinates moved up and down according to polarized light source can in conjunction with parabolic curve equation
To release the relationship of SPR resonance angle Yu polarized light source upright position.Below in conjunction with Fig. 2 and Fig. 3 extrapolate SPR resonance angle and partially
The relationship of vibration light source upright position.
Such as Fig. 2, it is assumed that when light source height ishWhen, surface plasma body resonant vibration occurs, resonance angle is at this timea, air refraction
Rate isn 1 , prism material refractive index isn 2 。
It is with apex angleiIsosceles prism for: set the corresponding parabolic equation of paraboloid asy 2 =2px, then on paraboloid
Incidence pointNCoordinate be (h 2/2p, h), pointNTangent slope bep/h, normal (L) slope be-h/p。
According to geometric triangulation relationship, angleb, cWithdIt can be expressed as following formula respectively.
, , 。
∵。
∴。
As shown in figure 3, anglef, bWithdMeet:f = b – d。
Then。
For actual device, parametern 1 , n 2 , pWithiIt is known, it is therefore apparent that SPR resonance angleaSize will be by
Light source vertical heighthDirectly determine.
Claims (7)
1. it is a kind of using parabolic reflector simplify surface plasma body resonant vibration (Surface Plasmon Resonance,
SPR prism excitation apparatus), characterized by comprising: polarization laser light source, parabolic mirror, optical path prism system and electricity
Lotus coupled device detector (CCD), as shown in Figure 1, the light that polarization laser light source 1 issues is reflected by parabolic reflector 2
On prism 3, thin metal layer 4 is vapor-deposited on the bottom surface of prism 3, when meeting SPR shooting condition, incident light is converted into SPR wave, enters
The Joule heat that light energy is changed into metal is penetrated, the intensity so as to cause 3 bottom reflection light of prism changes, the reflection of prism 3
Light intensity is detected by CCD 5, and polarized light source 1 and CCD 5 are installed on bracket 6, and can up and down adjustment position.
2. a kind of prism for simplifying surface plasma body resonant vibration using parabolic reflector according to claim 1 excites dress
It sets, which is characterized in that the laser light source is polarized light source, and for opposing prism bottom surface, polarization direction is that transverse magnetic field polarizes
(TM) it polarizes.
3. a kind of prism for simplifying surface plasma body resonant vibration using parabolic reflector according to claims 1 and 2 swashs
Transmitting apparatus, which is characterized in that the polarized light source can choose wide frequency light source or monochromatic sources: when selection wide frequency light source, then with
Frequency variation is used as detection parameters；When selection monochromatic sources, then changed using light intensity as detection parameters.
4. a kind of prism for simplifying surface plasma body resonant vibration using parabolic reflector according to claim 1 excites dress
It sets, which is characterized in that the reflective mirror shape is paraboloid, and paraboloidal curvature radius size should be designed in conjunction with actual requirement.
5. a kind of prism for simplifying surface plasma body resonant vibration using parabolic reflector according to claim 1 or 4 swashs
Transmitting apparatus, which is characterized in that the prism is placed in the focal point of parabolic reflector, to guarantee different location polarized light source institute
The light of transmitting can be incident on prism bases.
6. a kind of prism for simplifying surface plasma body resonant vibration using parabolic reflector swashs according to claim 1 or 5
Transmitting apparatus, which is characterized in that the prism can be prism, the other prisms structure such as sphere-prism or cylindrical prism.
7. a kind of prism for simplifying surface plasma body resonant vibration using parabolic reflector according to claim 1 excites dress
It sets, which is characterized in that the prism bases are coated with the metallic film that can excite SPR, and the metal coating technique is taken common true
The coating process such as sky vapor deposition and ion sputtering.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114779456A (en) * | 2022-05-26 | 2022-07-22 | 南开大学 | Compact incident angle adjusting device based on parabolic mirror |
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