CN205593922U - Polarization insensitivity type SPR sensing structure - Google Patents
Polarization insensitivity type SPR sensing structure Download PDFInfo
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- CN205593922U CN205593922U CN201620351201.0U CN201620351201U CN205593922U CN 205593922 U CN205593922 U CN 205593922U CN 201620351201 U CN201620351201 U CN 201620351201U CN 205593922 U CN205593922 U CN 205593922U
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Abstract
The utility model provides a polarization insensitivity type SPR sensing structure, including first prism, second prism and two sensing membranes that have the same parameter, the light of the P polarized component in the incident light of arbitrary polarization state arouses SPR in the first bottom surface of first prism, and the light of S polarized component arouses SPR in the second bottom surface of second prism. The utility model discloses need not to utilize the polarization device to carry out the P polarization to the incident light and handling and just to obtain good SPR response, the SPR response is irrelevant with the polarization state of incident light in addition, and effective the cost is reduced has improved sensing system's integrated level and stability. Furthermore, the utility model discloses do can be convenient combine together with optic fibre form optic fibre prism mating type SPR sensor for wavelength modulation or intensity modulation sensing.
Description
Technical field
This utility model relates to photoelectric detection technology field, more particularly, to a kind of polarized non-sensitive type SPR sensorgram structure.
Background technology
Sensing technology based on surface phasmon resonance (Surface Plasmon Resonance, SPR) principle, its topmost application is the refractive index of detection test substance.Reacting to each other between the component of material, material often can be reflected by the change of associated substances refractive index.Since the eighties in last century, sensing technology based on SPR principle development is very swift and violent, during this sensing technology has been widely used in the fields such as physics, biology, chemistry, environmental protection, medical science at present.By the modulation system to light wave, spr sensor can be divided into angle modulation type, wavelength-modulated type, intensity modulation type, phase modulation-type and polarization-modulating type five type.In recent years, people do a lot of work in terms of the optimization of spr sensor structure designs and improves detection sensitivity.At present, the research work of this respect is still hot subject.
In order to more effectively excite SPR, it is thus achieved that have the SPR spectral line of relatively high s/n ratio, current common practice is to utilize polarizer to be polarized by incident illumination as P polarization light, and then excites SPR with P polarization light.Conventional polarizer has following three kinds: polarizing prism, polaroid and polarization splitting prism.Polarizing prism utilizes the birefringent phenomenon of mineral crystal to be polarized light, and bandwidth of operation is the widest, and degree of polarization is the highest, but price is the highest；Polaroid utilizes chemical substance to be polarized the dichroism of light to light, and bandwidth of operation is narrower, less stable；Polarization splitting prism utilizes polarization spectro deielectric-coating to be polarized light, has preferable stability, but bandwidth of operation is narrower, and price is the highest.Visible, the polariser being applied in spr sensor is difficult at bandwidth of operation, degree of polarization, stability and four aspects of cost the most exhaustive.It addition, polarizer and sensing arrangement mostly are discrete placement, polarization direction needs carefully regulation could obtain optimal SPR response, reduces integrated level and the stability of sensor-based system.
Utility model content
This utility model is to overcome the high cost described in above-mentioned prior art, low integrated level and the defect of stability, it is provided that the polarized non-sensitive type SPR sensorgram structure of a kind of low cost, high integration and stability.
For solving above-mentioned technical problem, the technical solution of the utility model is as follows:
A kind of polarized non-sensitive type SPR sensorgram structure, described SPR sensorgram structure includes the first prism, the second prism and two sensing membrane with identical parameters, and described sensing membrane is to excite the thin film of SPR；
3 ribs of described first prism are parallel to each other, and three sides of the first prism are respectively the first incident minute surface, the first outgoing minute surface and the first bottom surface, and the first bottom surface is equal with the angle of the first incident minute surface and the first outgoing minute surface；
3 ribs of described second prism are parallel to each other, and three sides of the second prism are respectively the second incident minute surface, the second outgoing minute surface and the second bottom surface, and the second bottom surface is equal with the angle of the second incident minute surface and the second outgoing minute surface；
3 ribs of the first prism are perpendicular to three ribs of the second prism, and two sensing membrane are prepared respectively on the first bottom surface and the second bottom surface, and the first outgoing minute surface and the second incident minute surface fit.
In the preferred scheme of one, the length of 3 ribs of described first prism is equal with the length of the 3 of the second prism ribs.
In the preferred scheme of one, described first outgoing minute surface and the square that the second incident minute surface is congruence, the first outgoing minute surface and the second incident minute surface are completely superposed.
In the preferred scheme of one, described first outgoing minute surface and the second incident minute surface are fitted by the way of glued.
In the preferred scheme of one, described first prism and the second prism use the prism of identical material to make material and make.
Compared with prior art, technical solutions of the utility model provide the benefit that:
This utility model provides a kind of polarized non-sensitive type SPR sensorgram structure, including the first prism, the second prism and two sensing membrane with identical parameters, the light of the P-polarization component in the incident illumination 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.This utility model carries out P polarization process without using polarizer to incident illumination and is obtained with good SPR response, and SPR response is unrelated with the polarization state of incident illumination, effectively reduces cost, improves integrated level and the stability of sensor-based system.Additionally, this utility model can combine with optical fiber easily, form optical fiber-prism conjunction type spr sensor, sense for wavelength-modulated or intensity modulated.
Accompanying drawing explanation
Fig. 1 is structure and the light path schematic diagram of this utility model polarized non-sensitive type SPR sensorgram structure.
Detailed description of the invention
Accompanying drawing being merely cited for property explanation, it is impossible to be interpreted as the restriction to this patent；
In order to the present embodiment is more preferably described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product；
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may will be understood by omission.
With embodiment, the technical solution of the utility model is described further below in conjunction with the accompanying drawings.
Embodiment 1
As it is shown in figure 1, a kind of polarized non-sensitive type SPR sensorgram structure, described SPR sensorgram structure includes the first prism ad-bchf, the second prism dh-afge and two sensing membrane with identical parameters, and described sensing membrane is to excite the thin film of SPR；
3 ribs of the first prism ad-bchf are respectively ad, bc, fh and fh//ad//bc, three sides of the first prism ad-bchf are respectively the first incident minute surface abcd, the first outgoing minute surface afhd and the first bottom surface bchf, the angle of the incident minute surface abcd and the first outgoing minute surface afhd of the first bottom surface bchf and first is equal, i.e. △ abf is isosceles triangle；
3 ribs of the second prism dh-afge are respectively dh, af, eg and dh ∥ af ∥ eg, three sides of the second prism dh-afge are respectively the second incident minute surface afhd, the second outgoing minute surface dhge and the second bottom surface afge, the angle of the incident minute surface afhd and the second outgoing minute surface dhge of the second bottom surface afge and second is equal, i.e. △ dae is isosceles triangle；
3 ribs of the first prism ad-bchf are perpendicular to three ribs of the second prism dh-afge, and two sensing membrane are prepared afge on the first bottom surface bchf and the second bottom surface, the first outgoing minute surface and the second incident minute surface respectively and fitted, and are all designated as afhd.
In specific implementation process, the length of 3 ribs of described first prism is equal with the length of the 3 of the second prism ribs, i.e. fh=ad=bc=dh=af=eg.
In specific implementation process, described first outgoing minute surface and the square that the second incident minute surface is congruence, i.e. face adfh is square, and the first outgoing minute surface and the second incident minute surface are completely superposed.
In specific implementation process, described first outgoing minute surface and the second incident minute surface by gluing or are fitted in the cold worked mode of optics.
In specific implementation process, described first prism and the second prism use identical material, the prism of equal densities makes material and makes.
The operation principle of the present embodiment polarized non-sensitive type SPR sensorgram structure is:
The incident illumination of random polarization state is perpendicular to the incident minute surface abcd of the first prism ad-bchf and enters to inject prism, incide on the first bottom surface bchf, P-polarization component is at sensing membrane and external agency interface excitation SPR, the light of remaining P-polarization component and overwhelming majority S-polarization component is reflected, this reflection light is perpendicular to face adhf and enters to inject the second prism dh-afge, incides on the second bottom surface afge.Owing to the plane of incidence 1 of the first prism and the plane of incidence 2 of the second prism are mutually perpendicular to, after therefore reflection light enters the second prism dh-afge, former P-polarization component is converted into S-polarization component, and the overwhelming majority is reflected；Former S-polarization component is converted into P-polarization component, excites SPR on the second bottom surface afge.
General effect is in brief: the light of the P-polarization component in the incident illumination 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 emergent light of described structure is perpendicular to the second exit facet dhge outgoing.
The corresponding same or analogous parts of same or analogous label；
Term the being merely cited for property explanation of position relationship described in accompanying drawing, it is impossible to be interpreted as the restriction to this patent；
Obviously, above-described embodiment of the present utility model is only for clearly demonstrating this utility model example, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.All any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in this utility model scope of the claims.
Claims (5)
1. a polarized non-sensitive type SPR sensorgram structure, it is characterised in that described SPR sensorgram structure includes the first prism, the second prism and two sensing membrane with identical parameters, described sensing membrane is to excite the thin film of SPR；
3 ribs of described first prism are parallel to each other, and three sides of the first prism are respectively the first incident minute surface, the first outgoing minute surface and the first bottom surface, and the first bottom surface is equal with the angle of the first incident minute surface and the first outgoing minute surface；
3 ribs of described second prism are parallel to each other, and three sides of the second prism are respectively the second incident minute surface, the second outgoing minute surface and the second bottom surface, and the second bottom surface is equal with the angle of the second incident minute surface and the second outgoing minute surface；
3 ribs of the first prism are perpendicular to three ribs of the second prism, and two sensing membrane are prepared respectively on the first bottom surface and the second bottom surface, and the first outgoing minute surface and the second incident minute surface fit.
Polarized non-sensitive type SPR sensorgram structure the most according to claim 1, it is characterised in that the length of 3 ribs of described first prism is equal with the length of the 3 of the second prism ribs.
Polarized non-sensitive type SPR sensorgram structure the most according to claim 2, it is characterised in that described first outgoing minute surface and the square that the second incident minute surface is congruence, the first outgoing minute surface and the second incident minute surface are completely superposed.
Polarized non-sensitive type SPR sensorgram structure the most according to claim 1, it is characterised in that described first outgoing minute surface and the second incident minute surface are fitted by the way of glued.
Polarized non-sensitive type SPR sensorgram structure the most according to claim 1, it is characterised in that described first prism and the second prism use the prism of identical material to make material and make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620351201.0U CN205593922U (en) | 2016-04-25 | 2016-04-25 | Polarization insensitivity type SPR sensing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620351201.0U CN205593922U (en) | 2016-04-25 | 2016-04-25 | Polarization insensitivity type SPR sensing structure |
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| CN205593922U true CN205593922U (en) | 2016-09-21 |
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| CN201620351201.0U Withdrawn - After Issue CN205593922U (en) | 2016-04-25 | 2016-04-25 | Polarization insensitivity type SPR sensing structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699334A (en) * | 2016-04-25 | 2016-06-22 | 岭南师范学院 | Polarization insensitive type SPR sensing structure |
| CN109612966A (en) * | 2018-12-27 | 2019-04-12 | 南开大学 | The super surface refractive index sensor of all dielectric based on polarization insensitive method promise resonance |
-
2016
- 2016-04-25 CN CN201620351201.0U patent/CN205593922U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699334A (en) * | 2016-04-25 | 2016-06-22 | 岭南师范学院 | Polarization insensitive type SPR sensing structure |
| CN105699334B (en) * | 2016-04-25 | 2018-06-19 | 岭南师范学院 | A kind of polarized non-sensitive type SPR sensorgram structure |
| CN109612966A (en) * | 2018-12-27 | 2019-04-12 | 南开大学 | The super surface refractive index sensor of all dielectric based on polarization insensitive method promise resonance |
| CN109612966B (en) * | 2018-12-27 | 2021-01-26 | 南开大学 | All-dielectric super-surface refractive index sensor based on polarization-insensitive Fano resonance |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160921 Effective date of abandoning: 20180619 |