CN104345047A - Fiber localized SPR (Surface Plasma Resonance) sensor based on periodic metal structure - Google Patents
Fiber localized SPR (Surface Plasma Resonance) sensor based on periodic metal structure Download PDFInfo
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- CN104345047A CN104345047A CN201410610073.2A CN201410610073A CN104345047A CN 104345047 A CN104345047 A CN 104345047A CN 201410610073 A CN201410610073 A CN 201410610073A CN 104345047 A CN104345047 A CN 104345047A
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Abstract
The invention relates to a fiber localized SPR (Surface Plasma Resonance) sensor based on a periodic metal structure. The fiber localized SPR sensor comprises a fiber core and a fiber wrapping layer and a coating layer which wrap the two ends of the fiber core, wherein the nanoscale periodic metal nano-structure is arranged on the peripheral surface of the sensing area of the fiber core. The periodic metal nano-structure is a periodic metal nano cyclic structure modified on the peripheral surface of the sensing area of the fiber core. The periodic metal nano-structure is a periodic metal nano banded structure modified on the peripheral surface of the sensing area of the fiber core. The periodic metal nano-structure is a periodic metal nano spiral structure modified on the peripheral surface of the sensing area of the fiber core. A localized SPR effect is stimulated, so that the sensitivity and measurement accuracy of the sensor are improved. By adjusting the dimensions of the metal nano-strucutre, the control on measuring sensitivity can be realized, and then different application requirements are met. The fiber localized SPR sensor has higher measurement resolution while tiny size of the fiber SPR sensor is maintained.
Description
Technical field
The present invention relates to a kind of plasma resonance sensor.Particularly relate to a kind of optical fiber local surface plasma resonance sensor modified based on periodicity metal Nano structure carrying out periodically metal nano ring texture or banded structure or helicoidal structure modification at optical fiber surface plasmon resonance sensor senses district periphery.
Background technology
When certain wavelength P polarized light through prism be greater than critical angle incident time, surface plasma resonance (SPR) phenomenon can occur, show energy of reflection light and sharply decline, incident angle is now SPR angle.If cause the change of metal film surfaces refractive index in the change of the measured object concentration of metal film surfaces attachment, thus SPR optical signalling changes, according to this signal, just can obtain the information such as the refractive index of measured matter or concentration, the object reaching in real time, detect fast.
Surface plasma resonance measuring technique application is extensive, has very high researching value and wide market application foreground.Traditional prism-type spr sensor volume is comparatively large, is not easy to instrument miniaturization, cannot meets the special applications demands such as implanted measurement.Although optical fiber SPR sensor volume is little to be convenient to integrated, Measurement Resolution comparatively prism-type SPR declines to some extent, therefore how retain optical fiber volume little while improve the challenge that Measurement Resolution becomes optical fiber.
Summary of the invention
Technical matters to be solved by this invention is, provides a kind of and while guarantee optical fiber SPR sensor volume is small, can improve the optical fiber local surface plasma resonance sensor modified based on periodicity metal Nano structure of sensor measurement resolution.
The technical solution adopted in the present invention is: a kind of optical fiber local surface plasma resonance sensor based on periodicity metal construction, include fiber core and the fibre cladding and the coat that are wrapped in fiber core two ends, the outer peripheral face of the sensing unit of fiber core is provided with the periodicity metal Nano structure of nanoscale.
Described periodicity metal Nano structure is the periodicity metal nano ring texture of modifying on the outer peripheral face of fiber core sensing unit.
Described periodicity metal Nano structure is the banded structure of periodicity metal nano of modifying on the outer peripheral face of fiber core sensing unit.
Described periodicity metal Nano structure is the periodicity metal nano helicoidal structure modified on the outer peripheral face of fiber core sensing unit.
The optical fiber local surface plasma resonance sensor modified based on periodicity metal Nano structure of the present invention, periodically metal construction is utilized to modify on the surface, sensing unit of optical fiber SPR sensor, excite local surface plasma resonance effect (LSPR), improve sensitivity and the measuring accuracy of sensor.By adjusting the size of metal Nano structure, the control to measurement sensistivity can be realized, and then meet different application demands.The present invention remain optical fiber SPR sensor volume small while there is higher Measurement Resolution.
Accompanying drawing explanation
Fig. 1 is the schematic diagram modifying periodically metal nano ring texture on the sensing unit outer peripheral face of sensor of the present invention;
Fig. 2 is the schematic diagram modifying the banded structure of periodically metal nano on the sensing unit outer peripheral face of sensor of the present invention;
Fig. 3 is the schematic diagram modifying periodically metal nano helicoidal structure on the sensing unit outer peripheral face of sensor of the present invention.
In figure
1: fibre cladding and coat 2: fiber core
3: periodically metal nano ring texture 4: the periodically banded structure of metal nano
5: periodically metal nano helicoidal structure
Embodiment
Below in conjunction with embodiment and accompanying drawing, the optical fiber local surface plasma resonance sensor modified based on periodicity metal Nano structure of the present invention is described in detail.
The optical fiber local surface plasma resonance sensor modified based on periodicity metal Nano structure of the present invention, mainly by the periphery modified metal annulus of fiber core, band and helicoidal structure, reach the object improving sensor accuracy class and sensitivity.
As shown in Figure 1, Figure 2, Figure 3 shows, the optical fiber local surface plasma resonance sensor modified based on periodicity metal Nano structure of the present invention, include fiber core 2 and the fibre cladding and the coat 1 that are wrapped in fiber core 2 two ends, the outer peripheral face of the sensing unit of fiber core 2 is provided with the periodicity metal Nano structure of nanoscale.
As shown in Figure 1, described periodicity metal Nano structure is the periodicity metal nano ring texture 3 of modifying on the outer peripheral face of fiber core 2 sensing unit.Described periodicity metal nano ring texture 3 selects wide 70-100nm, and the metal grizzly bar of cycle 233-333nm, thickness 75-90nm is formed.The best selects wide 80nm, cycle 280nm, and the metal grizzly bar of thickness 80nm is formed.
As shown in Figure 2, described periodicity metal Nano structure can also be the banded structure 4 of periodicity metal nano of modifying on the outer peripheral face of fiber core 2 sensing unit.Periodically the banded structure 4 of metal nano selects wide 70-100nm, and the metal grizzly bar of cycle 233-333nm, thickness 75-90nm is formed.The best selects wide 80nm, cycle 280nm, and the metal grizzly bar of thickness 80nm is formed.
As shown in Figure 3, described periodicity metal Nano structure can also be the periodicity metal nano helicoidal structure 5 modified on the outer peripheral face of fiber core 2 sensing unit.Described periodicity metal nano helicoidal structure 5 can select the metal grizzly bar of periodically metal nano ring texture 3 and the banded similar of periodicity metal nano to form.
The principle of work of the optical fiber local surface plasma resonance sensor based on the modification of periodicity metal Nano structure of the present invention is: the concentration of solution to be measured and refractive index have certain linear relationship, when liquid concentration to be measured changes, refractive index changes, and the resonant wavelength of surface plasma resonance (SPR) phenomenon also will be moved thereupon.Therefore by detecting the change of resonant wavelength, indirect detection the concentration of testing sample can be gone out.Sensor of the present invention can carry out integrated with sample cavity, realizes the integration of liquid measurement of concetration to be measured.When the concussion frequency of free electron and incident light frequency that are bound by periodically metal Nano structure match, show as and the photonic absorption under specific wavelength and metallic nanostructured surface electromagnetic intensity are strengthened, excite local surface plasma resonance (LSPR) phenomenon.Because LSPR is the resonance effects caused at periodicity metallic nanostructured surface, and SPR is the resonance effects in whole metal surface, so the spatial resolution of LSPR sensor is high, has better measurement sensistivity.
According to the result of analog simulation, consider the wide and sensitivity of LSPR resonance peak fading depth, half-wave, metal ring structure and banded structure the best select the wide 80nm of metal grizzly bar, cycle 280nm, thickness 80nm; Helicoidal structure parameter with ring-type and banded structure similar.The optical fiber local surface plasma resonance sensor that the banded structure of periodicity metal nano ring texture of the present invention, periodically metal nano and periodically metal nano helicoidal structure are modified, traditional sensor construction being improved, strengthening the sensitivity of sensor by introducing periodically metal construction.
The present invention's all combinations that are open and that disclose can produce by using for reference disclosure herein, although combination of the present invention is described by detailed implementation process, but those skilled in the art obviously can be spliced device as herein described or change not departing from content of the present invention, spirit and scope, or increase and decrease some parts, more particularly, all similar replacements and change apparent to those skilled in the art, they are deemed to be included among spirit of the present invention, scope and content.
Claims (4)
1. the optical fiber local surface plasma resonance sensor based on periodicity metal construction, include fiber core (2) and be wrapped in fibre cladding and the coat (1) at fiber core (2) two ends, it is characterized in that, the outer peripheral face of the sensing unit of fiber core (2) is provided with the periodicity metal Nano structure of nanoscale.
2. the optical fiber local surface plasma resonance sensor based on periodicity metal construction according to claim 1, it is characterized in that, described periodicity metal Nano structure is the periodicity metal nano ring texture (3) of modifying on the outer peripheral face of fiber core (2) sensing unit.
3. the optical fiber local surface plasma resonance sensor based on periodicity metal construction according to claim 1, it is characterized in that, described periodicity metal Nano structure is the banded structure (4) of periodicity metal nano of modifying on the outer peripheral face of fiber core (2) sensing unit.
4. the optical fiber local surface plasma resonance sensor based on periodicity metal construction according to claim 1, it is characterized in that, described periodicity metal Nano structure is the periodicity metal nano helicoidal structure (5) modified on the outer peripheral face of fiber core (2) sensing unit.
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| CZ306428B6 (en) * | 2015-06-05 | 2017-01-18 | Technická univerzita v Liberci | A linear fibre formation with a case of polymeric nanofibres enveloping the supporting linear formation constituting the core, the method and equipment for its production |
| CN106558621A (en) * | 2016-10-12 | 2017-04-05 | 华中科技大学 | A kind of device at continuously adjustable plasmon resonance peak |
| CN109596688A (en) * | 2018-11-13 | 2019-04-09 | 天津大学 | A kind of liquid phase shifts the method for modifying of two-dimension nano materials layer to sensor surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ306428B6 (en) * | 2015-06-05 | 2017-01-18 | Technická univerzita v Liberci | A linear fibre formation with a case of polymeric nanofibres enveloping the supporting linear formation constituting the core, the method and equipment for its production |
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| CN106558621A (en) * | 2016-10-12 | 2017-04-05 | 华中科技大学 | A kind of device at continuously adjustable plasmon resonance peak |
| CN106558621B (en) * | 2016-10-12 | 2019-04-12 | 华中科技大学 | A kind of device at continuously adjustable plasmon resonance peak |
| CN109596688A (en) * | 2018-11-13 | 2019-04-09 | 天津大学 | A kind of liquid phase shifts the method for modifying of two-dimension nano materials layer to sensor surface |
| CN109596688B (en) * | 2018-11-13 | 2021-06-29 | 天津大学 | Modification method for transferring two-dimensional nano material layer to sensor surface through liquid phase |
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| CN104345047B (en) | 2017-06-16 |
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