CN104345047B - Optical fiber local surface plasma resonance sensor based on periodicity metal structure - Google Patents
Optical fiber local surface plasma resonance sensor based on periodicity metal structure Download PDFInfo
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- CN104345047B CN104345047B CN201410610073.2A CN201410610073A CN104345047B CN 104345047 B CN104345047 B CN 104345047B CN 201410610073 A CN201410610073 A CN 201410610073A CN 104345047 B CN104345047 B CN 104345047B
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Abstract
A kind of optical fiber local surface plasma resonance sensor based on periodicity metal structure, there is fiber core and be wrapped in the fibre cladding and coat at fiber core two ends, the periodicity metal Nano structure of nanoscale is provided with the outer peripheral face of the sensing unit of fiber core.Periodicity metal Nano structure is the periodicity metal nano cyclic structure modified on the outer peripheral face of fiber core sensing unit.Periodicity metal Nano structure is the periodicity metal nano banding structure modified on the outer peripheral face of fiber core sensing unit.Periodicity metal Nano structure is the periodicity metal nano helicoidal structure modified on the outer peripheral face of fiber core sensing unit.The present invention excites local surface plasma resonance effect, improves sensitivity and the certainty of measurement of sensor.By the size for adjusting metal Nano structure, it is possible to achieve the control to measurement sensitivity, and then meet different application demands.The present invention remain optical fiber SPR sensor volume it is small while with Measurement Resolution higher.
Description
Technical field
The present invention relates to a kind of plasma resonance sensor.It is more particularly to a kind of to be sensed in optical fiber surface plasmon resonance
Device sensing unit periphery carry out periodicity metal nano cyclic structure or banded structure or helicoidal structure modification based on the cycle
Property metal Nano structure modification optical fiber local surface plasma resonance sensor.
Background technology
When the P polarization light of certain wavelength passes through prism with more than critical angle incidence, it may occur that surface plasma resonance
(SPR) phenomenon, shows energy of reflection light and drastically declines, and incidence angle now is SPR angles.If in metal film surfaces attachment
The change of measured object concentration cause the change of metal film surfaces refractive index so that SPR optical signallings change, according to this
Individual signal, it is possible to obtain the information such as the refractive index or concentration of measured matter, reaches the real-time, purpose of quick detection.
Surface plasma resonance e measurement technology application field extensively, is applied with researching value very high and wide market
Prospect.Traditional prism-type spr sensor volume is larger, is not easy to instrument miniaturization, it is impossible to meet implanted measurement etc. special
Application demand.Although optical fiber SPR sensor small volume is easy to integrated, Measurement Resolution has declined compared with prism-type SPR, therefore
Measurement Resolution how is improved while optical fiber small volume is retained becomes a challenge of optical fiber.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of can ensure optical fiber SPR sensor volume it is small
Meanwhile, the optical fiber local surface plasma based on the modification of periodicity metal Nano structure that improve sensor Measurement Resolution is total to
Vibration sensor.
The technical solution adopted in the present invention is：A kind of optical fiber local surface plasma based on periodicity metal structure is total to
Vibration sensor, includes fiber core and is wrapped in the fibre cladding and coat at fiber core two ends, in the biography of fiber core
The periodicity metal Nano structure of nanoscale is provided with the outer peripheral face of sensillary area.
Described periodicity metal Nano structure is the periodicity metal modified on the outer peripheral face of fiber core sensing unit
Nanometer cyclic structure.
Described periodicity metal Nano structure is the periodicity metal modified on the outer peripheral face of fiber core sensing unit
Nanobelt shape structure.
Described periodicity metal Nano structure is the periodicity metal modified on the outer peripheral face of fiber core sensing unit
Nanometer spiral shape structure.
Optical fiber local surface plasma resonance sensor based on the modification of periodicity metal Nano structure of the invention, utilizes
Periodicity metal structure is modified on the sensing unit surface of optical fiber SPR sensor, excites local surface plasma resonance to imitate
Answer (LSPR), improve sensitivity and the certainty of measurement of sensor.By the size for adjusting metal Nano structure, it is possible to achieve to surveying
The control of sensitivity is measured, and then meets different application demands.The present invention is remaining small same of optical fiber SPR sensor volume
When with Measurement Resolution higher.
Brief description of the drawings
Fig. 1 is the signal that periodicity metal nano cyclic structure is modified on the sensing unit outer peripheral face of inventive sensor
Figure；
Fig. 2 is the signal that periodicity metal nano banding structure is modified on the sensing unit outer peripheral face of inventive sensor
Figure；
Fig. 3 is the signal that periodicity metal nano helicoidal structure is modified on the sensing unit outer peripheral face of inventive sensor
Figure.
In figure
1：Fibre cladding and coat 2：Fiber core
3：Periodicity metal nano cyclic structure 4：Periodicity metal nano banding structure
5：Periodicity metal nano helicoidal structure
Specific embodiment
With reference to embodiment and accompanying drawing to the optical fiber local table modified based on periodicity metal Nano structure of the invention
Face plasma resonance sensor is described in detail.
Optical fiber local surface plasma resonance sensor based on the modification of periodicity metal Nano structure of the invention, mainly
It is, by the periphery modified metal annulus in fiber core, band and helicoidal structure, to reach raising sensor accuracy class
With the purpose of sensitivity.
As shown in Figure 1, Figure 2, Figure 3 shows, optical fiber local surface based on the modification of periodicity metal Nano structure of the invention etc.
Ion resonance sensor, includes fiber core 2 and is wrapped in the fibre cladding and coat 1 at the two ends of fiber core 2, in optical fiber
The periodicity metal Nano structure of nanoscale is provided with the outer peripheral face of the sensing unit of fibre core 2.
As shown in figure 1, described periodicity metal Nano structure is modified on the outer peripheral face of the sensing unit of fiber core 2
Periodicity metal nano cyclic structure 3.Described periodicity metal nano cyclic structure 3 is from width 70-100nm, cycle
The metal grizzly bar of 233-333nm, thickness 75-90nm is constituted.It is optimal to select width 80nm, cycle 280nm, the metal gate of thickness 80nm
Bar is constituted.
As shown in Fig. 2 described periodicity metal Nano structure can also be on the outer peripheral face of the sensing unit of fiber core 2
The periodicity metal nano banding structure 4 of modification.Periodicity metal nano banding structure 4 is from width 70-100nm, cycle
The metal grizzly bar of 233-333nm, thickness 75-90nm is constituted.It is optimal to select width 80nm, cycle 280nm, the metal gate of thickness 80nm
Bar is constituted.
As shown in figure 3, described periodicity metal Nano structure can also be on the outer peripheral face of the sensing unit of fiber core 2
The periodicity metal nano helicoidal structure 5 of modification.Described periodicity metal nano helicoidal structure 5 can be from periodically
The metal grizzly bar similar with periodicity metal nano banding structure of metal nano cyclic structure 3 is constituted.
The work of the optical fiber local surface plasma resonance sensor based on the modification of periodicity metal Nano structure of the invention
It is as principle：The concentration and refractive index of solution to be measured have certain linear relationship, when prepare liquid concentration produces change, refraction
Rate produces change, and the resonant wavelength of surface plasma resonance (SPR) phenomenon will also be moved therewith.Therefore by detecting resonance
The change of wavelength, can go out the concentration of testing sample with indirect detection.Sensor of the invention can carry out integrated, realization with sample cavity
The integration of prepare liquid measurement of concetration.When the concussion frequency and incident light of the free electron for being bound by periodicity metal Nano structure
When frequency matches, show as strengthening the photonic absorption under specific wavelength and metallic nanostructured surface electromagnetic field intensity, swash
Hair local surface plasma resonance (LSPR) phenomenon.Because LSPR is that the resonance caused in periodicity metallic nanostructured surface is imitated
Should, and SPR is the resonance effects in whole metal surface, so the spatial resolution of LSPR sensors is high, there is preferably measurement
Sensitivity.
According to the result of analog simulation, consider that LSPR formants fading depth, half-wave be wide and sensitivity, metal ring
Structure and banded structure most preferably select metal grizzly bar 80nm wide, cycle 280nm, thickness 80nm；The same ring-type of helicoidal structure parameter
It is similar with banded structure.Periodicity metal nano cyclic structure of the invention, periodicity metal nano banding structure and periodicity
The optical fiber local surface plasma resonance sensor of metal nano helicoidal structure modification, is carried out to traditional sensor construction
Improve, the sensitivity of sensor is strengthened by introducing periodicity metal structure.
The all combinations for disclosing and disclosing of the invention can be produced by using for reference disclosure, although of the invention group
Conjunction is described by detailed implementation process, but those skilled in the art can substantially not depart from present invention, essence
Device as herein described is spliced or changed in god and scope, or is increased and decreased some parts, it is more specifically, all similar
Replacement and change apparent to those skilled in the art, they are considered as being included in spirit of the invention, model
Enclose among content.
Claims (1)
1. a kind of optical fiber local surface plasma resonance sensor based on periodicity metal structure, includes fiber core（2）
Be wrapped in fiber core（2）The fibre cladding and coat at two ends（1）, it is characterised in that in fiber core（2）Sensing unit
Outer peripheral face on be provided with the periodicity metal Nano structure of nanoscale, wherein, described periodicity metal Nano structure is
In fiber core（2）The periodicity metal nano cyclic structure modified on the outer peripheral face of sensing unit（3）, or, the described cycle
Property metal Nano structure is in fiber core（2）The periodicity metal nano banding structure modified on the outer peripheral face of sensing unit（4）
Or, described periodicity metal Nano structure is in fiber core（2）The periodicity metal modified on the outer peripheral face of sensing unit
Nanometer spiral shape structure（5）.
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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 |
| CN106558621B (en) * | 2016-10-12 | 2019-04-12 | 华中科技大学 | A kind of device at continuously adjustable plasmon resonance peak |
| 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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| US7438824B2 (en) * | 2005-03-25 | 2008-10-21 | National Research Council Of Canada | Fabrication of long range periodic nanostructures in transparent or semitransparent dielectrics |
| US7228017B2 (en) * | 2005-09-30 | 2007-06-05 | General Electric Company | Fiber optic sensing device and method of making and operating the same |
| US8305583B2 (en) * | 2005-11-11 | 2012-11-06 | National Chung Cheng University | Localized surface plasmon resonance sensing system, appartatus, method thereof |
| CN102809388B (en) * | 2012-08-20 | 2015-02-11 | 中国科学院重庆绿色智能技术研究院 | Optical fiber probe sensor |
| US8741657B1 (en) * | 2013-02-25 | 2014-06-03 | U.S. Department Of Energy | Nanocomposite thin films for optical gas sensing |
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Non-Patent Citations (1)
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| Fiber optic surface plasmon resonance sensors with subwavelength metallic gratings: numerical study;Sookyoung Roh et al;《20th International Conference on Optical Fibre Sensors》;20091231;第2-3页第2部分 * |
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