CN105699334B - A kind of polarized non-sensitive type SPR sensorgram structure - Google Patents
A kind of polarized non-sensitive type SPR sensorgram structure Download PDFInfo
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- CN105699334B CN105699334B CN201610259159.4A CN201610259159A CN105699334B CN 105699334 B CN105699334 B CN 105699334B CN 201610259159 A CN201610259159 A CN 201610259159A CN 105699334 B CN105699334 B CN 105699334B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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Abstract
The present invention provides a kind of polarized non-sensitive type SPR sensorgram structure, there is the sensing membrane of identical parameters including the first prism, the second prism and two, the light of P-polarization component in the incident light of random polarization state excites SPR in the first bottom surface of the first prism, and the light of S-polarization component excites SPR in the second bottom surface of the second prism.The present invention carries out incident light P polarization processing without using polarizer and is obtained with good SPR responses, and SPR responses are unrelated with the polarization state of incident light, effectively reduce cost, improve the integrated level and stability of sensor-based system.In addition, the present invention can be easily combined with optical fiber, optical fiber prism mating type spr sensor is formed, for wavelength modulation or intensity modulated sensing.
Description
Technical field
The present invention relates to photoelectric detection technology field, more particularly, to a kind of polarized non-sensitive type SPR sensorgram structure.
Background technology
Based on surface phasmon resonance（Surface Plasmon Resonance, SPR）The sensing technology of principle,
Most important application is to detect the refractive index of test substance.Reacting to each other between the component of substance, substance can often pass through
The variation of associated substances refractive index reflects.Since the eighties in last century, the sensing technology development ten based on SPR principles
Divide rapidly, the sensing technology has been widely used in the fields such as physics, biology, chemistry, environmental protection, medicine at present.By to light wave
Modulation system, spr sensor can be divided into angle modulated type, wavelength modulation type, intensity modulation type, phase modulation-type and polarization adjust
Five type of type processed.In recent years, people have done a large amount of in terms of the optimization design of spr sensor structure and raising detection sensitivity
Work.At present, the research work of this respect is still hot subject.
In order to more effectively excite SPR, obtain with the SPR spectral lines compared with high s/n ratio, common practice is to utilize at present
Incident light is polarized as P polarization light by polarizer, and then excites SPR with P polarization light.Common polarizer has following three
Kind：Devating prism, polarizer and polarization splitting prism.Devating prism plays light using the birefringent phenomenon of mineral crystal
Partially, bandwidth of operation is most wide, degree of polarization highest, but price also highest；Polarizer is using chemical substance to the dichroism of light to light
It is polarized, bandwidth of operation is relatively narrow, and stability is poor；Polarization splitting prism is polarized light using polarization spectro deielectric-coating,
With preferable stability, but bandwidth of operation is relatively narrow, and price is also higher.As it can be seen that it is difficult to applied to the polarizer in spr sensor
It is all exhaustive at bandwidth of operation, degree of polarization, stability and four aspects of cost.In addition, polarizer is mostly with sensing arrangement
Discrete placement, polarization direction, which needs carefully to adjust, could obtain best SPR responses, reduce the integrated level of sensor-based system with surely
It is qualitative.
Invention content
The defects of present invention is overcomes high cost described in the above-mentioned prior art, low integrated level and stability, provides one kind
The polarized non-sensitive type SPR sensorgram structure of low cost, high integration and stability.
In order to solve the above technical problems, technical scheme is as follows：
A kind of polarized non-sensitive type SPR sensorgram structure, the SPR sensorgram structure include the first prism, the second prism
And two sensing membranes with identical parameters, the sensing membrane is that can excite the film of SPR；
3 ribs of first prism are parallel to each other, three sides of the first prism be respectively the first incident minute surface,
First outgoing minute surface and the first bottom surface, the first bottom surface are equal with the angle of the first incident minute surface and the first outgoing minute surface；
3 ribs of second prism are parallel to each other, three sides of the second prism be respectively the second incident minute surface,
Second incident minute surface and the second bottom surface, the second bottom surface are equal with the angle of the second incident minute surface and the second outgoing minute surface；
Perpendicular to three ribs of the second prism, two sensing membranes are prepared respectively at the first bottom 3 ribs of the first prism
On face and the second bottom surface, the first outgoing minute surface fits with the second incident minute surface.
In a kind of preferred scheme, the length of 3 ribs of first prism and the length of 3 ribs of the second prism
It spends equal.
In a kind of preferred scheme, the square of the first outgoing minute surface and the second incident minute surface for congruence, first
Outgoing minute surface is completely superposed with the second incident minute surface.
In a kind of preferred scheme, the first outgoing minute surface and the second incident minute surface are pasted by way of glued
It closes.
In a kind of preferred scheme, first prism and the second prism make material using the prism of phase same material
Material is made.
Compared with prior art, the advantageous effect of technical solution of the present invention is：
The present invention provides a kind of polarized non-sensitive type SPR sensorgram structure, including the first prism, the second prism and two
A sensing membrane with identical parameters, the light of the P-polarization component in the incident light of random polarization state is the first of the first prism
Bottom surface excites SPR, and the light of S-polarization component excites SPR in the second bottom surface of the second prism.The present invention is without using polarizer
P polarization processing is carried out to incident light and is obtained with good SPR responses, and SPR responses are unrelated with the polarization state of incident light,
Cost is effectively reduced, improves the integrated level and stability of sensor-based system.In addition, the present invention easily can be tied mutually with optical fiber
It closes, forms optical fiber-prism mating type spr sensor, for wavelength modulation or intensity modulated sensing.
Description of the drawings
Fig. 1 is the structure and light path schematic diagram of polarized non-sensitive type SPR sensorgram structure of the present invention.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to more preferably illustrate the present embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be appreciated that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, a kind of polarized non-sensitive type SPR sensorgram structure, the SPR sensorgram structure includes the first prism
Ad-bchf, the second prism dh-afge and two have the sensing membrane of identical parameters, and the sensing membrane is can excite SPR
Film；
3 ribs of first prism ad-bchf are respectively ad, bc, fh and fh//ad//bc, the first prism ad-bchf
Three sides be respectively the first incident minute surface abcd, the first outgoing minute surface afhd and the first bottom surface bchf, the first bottom surface bchf
Equal with the angle of the outgoing minute surfaces of the first incidence minute surface abcd and first afhd, i.e. △ abf are isosceles triangle；
3 ribs of second prism dh-afge are respectively dh, af, eg and dh ∥ af ∥ eg, the second prism dh-afge
Three sides be respectively the second incident minute surface afhd, the second incidence minute surface dhge and the second bottom surface afge, the second bottom surface afge
Equal with the angle of the outgoing minute surfaces of the second incidence minute surface afhd and second dhge, i.e. △ dae are isosceles triangle；
3 ribs of first prism ad-bchf are perpendicular to three ribs of the second prism dh-afge, two sensing membranes point
The afge on the first bottom surface bchf and the second bottom surface is not prepared, and the first outgoing minute surface fits with the second incident minute surface, is denoted as
afhd。
In specific implementation process, the length of 3 ribs of first prism and the length of 3 ribs of the second prism
It is equal, i.e. fh=ad=bc=dh=af=eg.
In specific implementation process, the square of the first outgoing minute surface and the second incident minute surface for congruence, i.e. face
Adfh is square, and the first outgoing minute surface is completely superposed with the second incident minute surface.
In specific implementation process, the first outgoing minute surface and the second incident minute surface are pasted by way of glued
It closes.
In specific implementation process, first prism and the second prism use the prism making material of phase same material
It is made.
The operation principle of the present embodiment polarized non-sensitive type SPR sensorgram structure is：
The incident light of random polarization state enters trigone perpendicular to the incident minute surface abcd incidences of the first prism ad-bchf
Mirror is incident on the first bottom surface bchf, and P-polarization component is in sensing membrane and external agency interface excitation SPR, remaining P polarization point
The light of amount and most S-polarization components is reflected, which enters the second prism dh- perpendicular to face adhf incidences
Afge is incident on the second bottom surface afge.Since the plane of incidence 2 of 1 and second prism of the plane of incidence of the first prism mutually hangs down
Directly, therefore after reflected light enters the second prism dh-afge, former P-polarization component is converted into S-polarization component, and the overwhelming majority is anti-
It penetrates；Former S-polarization component is converted into P-polarization component, and SPR is excited on the second bottom surface afge.
General effect is in brief：The light of P-polarization component in the incident light of random polarization state is in the first prism
First bottom surface excites SPR, and the light of S-polarization component excites SPR in the second bottom surface of the second prism.The emergent light of the structure hangs down
Directly it is emitted in the second exit facet dhge.
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, it is impossible to be interpreted as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (5)
1. a kind of polarized non-sensitive type SPR sensorgram structure, which is characterized in that the SPR sensorgram structure includes the first prism, the
Two prisms and two sensing membranes with identical parameters, the sensing membrane is that can excite the film of SPR；
3 ribs of first prism are parallel to each other, and three sides of the first prism are respectively the first incident minute surface, first
Minute surface and the first bottom surface are emitted, the first bottom surface is equal with the angle of the first incident minute surface and the first outgoing minute surface；
3 ribs of second prism are parallel to each other, and three sides of the second prism are respectively the second incident minute surface, second
Incident minute surface and the second bottom surface, the second bottom surface are equal with the angle of the second incident minute surface and the second outgoing minute surface；
3 ribs of the first prism perpendicular to the second prism three ribs, two sensing membranes prepare respectively in the first bottom surface and
On second bottom surface, the first outgoing minute surface fits with the second incident minute surface.
2. polarized non-sensitive type SPR sensorgram structure according to claim 1, which is characterized in that the 3 of first prism
The length of rib and the equal length of 3 ribs of the second prism.
3. polarized non-sensitive type SPR sensorgram structure according to claim 2, which is characterized in that the first outgoing minute surface
With square of the second incident minute surface for congruence, the first outgoing minute surface is completely superposed with the second incident minute surface.
4. polarized non-sensitive type SPR sensorgram structure according to claim 1, which is characterized in that the first outgoing minute surface
It is bonded by way of glued with the second incident minute surface.
5. polarized non-sensitive type SPR sensorgram structure according to claim 1, which is characterized in that first prism and
Second prism is made of the prism making material of phase same material.
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| EP1415140B1 (en) * | 2001-08-06 | 2006-09-27 | Cambridge Consultants Limited | Spr interferometer |
| CN1344926A (en) * | 2001-11-02 | 2002-04-17 | 清华大学 | Adaptive surface plasma wave gas refractivity sensor |
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