CN104792763B - Raman scattering exciting method and device - Google Patents
Raman scattering exciting method and device Download PDFInfo
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- CN104792763B CN104792763B CN201410461244.XA CN201410461244A CN104792763B CN 104792763 B CN104792763 B CN 104792763B CN 201410461244 A CN201410461244 A CN 201410461244A CN 104792763 B CN104792763 B CN 104792763B
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Abstract
The present invention provides a kind of Raman scattering excitation apparatus, it is characterised in that including：Micro- metal column array of plasma wave can be produced after incident laser radiation, wherein, micro- metal column array includes densely arranged several micro- metal columns in virtual semi-sphere, each micro- metal column is cylinder, the bearing of trend of cylinder is consistent with the radial direction of virtual semi-sphere, incident laser includes the light beam of vertical each micro- metal column, and the centre of sphere of light beam directive virtual semi-sphere, plasma wave excites the Raman diffused light of sample in centre of sphere areas adjacent.Raman scattering excitation apparatus of the invention can strengthen Ramam effect.
Description
Technical field
The present invention relates to a kind of Raman scattering exciting method and device, belong to optical technical field.
Background technology
Ramam effect, also referred to as Raman scattering, the inelastic scattering phenomenon of photon, nineteen twenty-eight is by India physicist Qian Dela
Fork clip La Laman discoveries, refer to the light wave phenomenon that frequency changes after being scattered.When light dissipates from an atom or molecule
When shooting out, most of photon is all elastic scattering, and this is referred to as Rayleigh scattering.Under Rayleigh scattering, scatter out
Photon, photon during with injecting, its energy, frequency and wavelength are identicals.However, have the photon that sub-fraction is scattered, greatly
It is approximately to occur one in 10,000,000 photons, the frequency after scattering can produce change, and photon when normally below injecting is frequently
Rate, reason is that energy exchange occurs between incident photon and medium molecule.This is Raman scattering.
Raman scattering is inherent the characteristics of just have weak output signal, particularly carries out Raman to gas or low-concentration liquid
During spectrum analysis, because test substance molecular concentration is especially low, high-quality Raman spectrum relative difficult is obtained, it usually needs
Use the sample cell of high power laser and longer path.Laser power is limited, sample it is micro in the case of, how to strengthen
Ramam effect is to improve the key of Raman spectrum quality.
The content of the invention
The present invention is carried out to solve the above problems, it is therefore intended that provide a kind of drawing that can strengthen Ramam effect
Graceful scattering exciting method and device.
The present invention provides a kind of Raman scattering excitation apparatus, it is characterised in that including：Can be produced after incident laser radiation
Micro- metal column array of plasma wave, wherein, micro- metal column array includes that densely arranged several in virtual semi-sphere are micro-
Metal column, each micro- metal column is cylinder, and the bearing of trend of cylinder is consistent with the radial direction of virtual semi-sphere, and incidence swashs
Light beam of the light including vertical each micro- metal column, the centre of sphere of light beam directive virtual semi-sphere, plasma wave is in centre of sphere near zone
Excite the Raman diffused light of sample.
In addition, in a kind of Raman scattering excitation apparatus of the invention, can also have the feature that：Wherein, each
A diameter of nanometer or micron order of micro- metal column.
In addition, in a kind of Raman scattering excitation apparatus of the invention, can also have the feature that：Positioned at micro- metal
The first lens that post array upper horizontal is set, the focus of the first lens overlaps with the centre of sphere of virtual semi-sphere.
In addition, in a kind of Raman scattering excitation apparatus of the invention, can also have the feature that：Positioned at micro- metal
Post array top is used to fix the spherical glass substrate of micro- metal column array, and spherical glass substrate is in the sphere of virtual semi-sphere
On, the lower surface of spherical glass substrate is fixed in the upper surface of each micro- metal column, after incident laser passes through spherical glass substrate,
Vertical irradiation is to the upper surface of each micro- metal column.
The present invention also provides a kind of Raman scattering exciting method, and using above-mentioned Raman scattering excitation apparatus, its feature exists
In comprising the following steps：
Step one, Raman scattering excitation apparatus are installed, the second lens are set gradually below Raman scattering excitation apparatus
And detector；
Step 2, sample is placed on centre of sphere near zone, the collimated laser beam of vertical direction is irradiated to the first lens
On；
Step 3, incident laser are by after the convergence of the first lens, being irradiated on spherical glass substrate, and pass through spherical glass
Substrate, vertical irradiation to the upper surface of each micro- metal column so that excite plasma wave at the lower surface edge of micro- metal column,
Each lower surface concentrates on centre of sphere near zone so that plasma wave is assembled to form exciting field in centre of sphere near zone；
Step 4, sample are excited Raman diffused light in exciting field, and Raman diffused light is collected and converged to through the second lens
On detector, it is received by a detector.
In addition, in a kind of Raman scattering exciting method of the invention, can also have the feature that：Wherein, sample
It is gas or the liquid of low concentration.
In addition, in a kind of Raman scattering exciting method of the invention, can also have the feature that：Wherein, sample
It is housed inside in transparent accommodating chamber, the surrounding of the scope of transparent accommodating chamber around centre of sphere near zone.
The present invention also provides a kind of Raman detector, it is characterised in that including：The light source of incident laser is provided；For swashing
The Raman scattering excitation apparatus of Raman diffused light in hair sample, Raman scattering excitation apparatus are that above-mentioned Raman scattering excites dress
Put；And the spectroanalysis instrument being connected with Raman scattering excitation apparatus, the phase for measuring different wavelengths of light in Raman diffused light
To intensity obtaining Raman spectrum.
Invention effect and effect
Raman scattering excitation apparatus of the invention, because there is micro- metal column array, including it is densely arranged virtual
Several micro- metal columns in hemisphere, incident laser vertical irradiation to the upper surface of each micro- metal column so that lower surface edge
Place excites the intensity of plasma wave, plasma wave to be significantly larger than incident laser so that incide the photon energy in sample
Drastically strengthen, enhance Ramam effect.
Further, since the bearing of trend of micro- metal column is consistent with the radial direction of virtual semi-sphere, each lower surface is concentrated on
Centre of sphere near zone so that plasma wave is assembled in centre of sphere near zone, produces huge Electromagnetic enhancement effect, causes sample
The Raman scattering intensities of molecule increase in product, further enhancing Ramam effect.
Brief description of the drawings
Fig. 1 is structural representation of the Raman detector of the invention in embodiment；And
Fig. 2 is structural representation of the Raman scattering excitation apparatus of the invention in embodiment.
Specific embodiment
Raman scattering exciting method involved in the present invention and device are elaborated referring to the drawings.
Fig. 1 is structural representation of the Raman detector of the invention in embodiment.
As shown in figure 1, Raman detector 100 includes light source 11, Raman scattering excitation apparatus 10 and spectroanalysis instrument 12.Light
Source 11 can provide incident laser, can launch the collimated laser beam of vertical direction.Raman scattering excitation apparatus 10 are used to excite
Raman diffused light in sample.Spectroanalysis instrument 12 is used to measure the relative intensity of different wavelengths of light in Raman diffused light to be drawn
Graceful spectrum.
Fig. 2 is structural representation of the Raman scattering excitation apparatus of the invention in embodiment.
As shown in Fig. 2 Raman scattering excitation apparatus 10 include the first lens 1, spherical glass substrate 2, micro- metal column array
3 and transparent accommodating chamber 20.
First lens 1 are located at the top of spherical glass substrate 2.Spherical glass substrate 2 is on the sphere of virtual semi-sphere 6.
The focus of the first lens 1 overlaps with the centre of sphere of virtual semi-sphere 6, namely is overlapped with the centre of sphere of spherical glass substrate 2.
Micro- metal column array 3 includes densely arranged several micro- metal columns 31 in virtual semi-sphere 6.Each micro- metal column
31 are cylinder, and diameter is 1 micron.The bearing of trend of cylinder is consistent with the radial direction of virtual semi-sphere 6.Each micro- gold
The upper surface for belonging to post 31 is both secured to the lower surface of spherical glass substrate 2.
The collimated laser beam of the incoming vertical direction of light source 11 is irradiated on the first lens 1, is assembled by the first lens 1
Afterwards, it is irradiated on spherical glass substrate 2, the centre of sphere of directive virtual semi-sphere 6.Then, through spherical glass substrate 2, vertical irradiation
To the upper surface of each micro- metal column 31 so that excite plasma wave at the lower surface edge of micro- metal column 31.Plasma
The intensity of ripple is very high, reaches tens or hundred times of incident laser intensity.In micro- metal column diameter, material, spacing and arrangement
In the case that mode determines, plasma wave is also influenceed and Strength Changes occurs by polarization state and wavelength etc. of incident laser.
Because micro- metal column 31 is densely arranged in virtual semi-sphere 6, and all point to the centre of sphere so that under micro- metal column 31
Marginal surface concentrates on centre of sphere near zone, causes plasma wave to be assembled in centre of sphere near zone, forms exciting field.Exciting field
Huge Electromagnetic enhancement effect is produced to being put into sample therein, the Raman scattering intensities of sample can be greatly enhanced.Therefore, i.e.,
Molecular concentration is very low in making sample, such as the liquid of gas or low concentration, when touching exciting field, can also be inspired high-strength
The Raman diffused light of degree.
Sample includes the liquid of gas or low concentration.Transparent accommodating chamber 20 is placed at the centre of sphere, and scope is centered around the centre of sphere
The surrounding of near zone, for accommodating sample.The two ends of transparent accommodating chamber 20 set inlet and outlet.Sample can be filled from import
Transparent accommodating chamber 20, and discharged from outlet.
Raman scattering exciting method employed in the present embodiment, comprises the following steps：
(1) Raman scattering excitation apparatus 10 are installed, the second lens 4 is set gradually below Raman scattering excitation apparatus 10
With detector 5 so that detector 5 is located on the focal plane of the second lens 4.Then, detector 5 is connected with spectroanalysis instrument 12
Connect.
(2) sample is packed into transparent accommodating chamber from import, transparent accommodating chamber is then placed on the centre of sphere of virtual semi-sphere 6
Near zone.Then, the collimated laser beam of vertical direction is irradiated on the first lens 1.
(3) incident laser is by after the convergence of the first lens 1, being irradiated on spherical glass substrate 2, and passes through spherical glass base
Plate 2, vertical irradiation to the upper surface of each micro- metal column 31 so that excite plasma at the lower surface edge of micro- metal column 31
Ripple.
Each lower surface concentrates on centre of sphere near zone so that plasma wave is assembled to be formed and excited in centre of sphere near zone
.
(4) sample is excited Raman diffused light in exciting field, and Raman diffused light is collected through the second lens 4 and converges to detection
On device 5, received by detector 5.Detector 5 connects can be transferred to Raman spectrum analysis instrument 12 by Raman signal, can obtain high-quality
The Raman spectrum of amount, so as to be easy to analyze the composition etc. of sample.After detection is finished, stop laser beam, by sample from outlet
Discharge.
Embodiment is acted on and effect
Raman scattering excitation apparatus according to the present embodiment, because there is micro- metal column array, including it is densely arranged in void
Intend several the micro- metal columns in hemisphere, incident laser vertical irradiation to the upper surface of each micro- metal column so that lower surface side
The intensity of plasma wave, plasma wave is excited to be significantly larger than incident laser at edge so as to incide the photon energy in sample
Amount drastically strengthens, and enhances Ramam effect.
Further, since the bearing of trend of micro- metal column is consistent with the radial direction of virtual semi-sphere, each lower surface is concentrated on
Centre of sphere near zone so that plasma wave is assembled in centre of sphere near zone, produces huge Electromagnetic enhancement effect, causes sample
The Raman scattering intensities of molecule increase in product, further enhancing Ramam effect.
Certainly, Raman scattering exciting method of the present invention and device are not merely defined in above-mentioned specific embodiment party
Formula.The diameter of micro- metal column can also be other numerical values reciteds in 200 nanometers to 10 micrometer ranges, and micro- metal column is straight
Footpath is smaller, and underside view of part is more intensive, and the Electromagnetic enhancement effect in exciting field is bigger.
Claims (8)
1. a kind of Raman scattering excitation apparatus, excite Raman diffused light in the sample, it is characterised in that including：
Micro- metal column array of plasma wave can be produced after incident laser radiation,
Wherein, micro- metal column array includes densely arranged several micro- metal columns in virtual semi-sphere, each described micro- metal
Post is cylinder, and the bearing of trend of the cylinder is consistent with the radial direction of the virtual semi-sphere,
The incident laser includes the light beam of vertical each micro- metal column, the ball of virtual semi-sphere described in the light beam directive
The heart,
The plasma wave excites the Raman diffused light of the sample in the centre of sphere near zone.
2. Raman scattering excitation apparatus according to claim 1, it is characterised in that：
Wherein, a diameter of nanometer or micron order of each micro- metal column.
3. Raman scattering excitation apparatus according to claim 1, it is characterised in that also include：
Positioned at the first lens that micro- metal column array upper horizontal is set, the focus of first lens and described virtual half
The centre of sphere of ball overlaps.
4. Raman scattering excitation apparatus according to claim 1, it is characterised in that also include：
It is used to fix the spherical glass substrate of micro- metal column array, the sphere glass positioned at micro- metal column array top
Glass substrate is on the sphere of the virtual semi-sphere, and the spherical glass substrate is fixed in the upper surface of each micro- metal column
Lower surface, the incident laser through after the spherical glass substrate, upper table of the vertical irradiation to micro- metal column each described
Face.
5. a kind of Raman scattering exciting method, is swashed using the Raman scattering described in any one in claim 1 to claim 4
Transmitting apparatus, it is characterised in that comprise the following steps：
Step one, the Raman scattering excitation apparatus are installed, second is set gradually below the Raman scattering excitation apparatus
Lens and detector；
Step 2, the sample is placed on the centre of sphere near zone, the collimated laser beam of vertical direction is irradiated to described
On first lens；
Step 3, the incident laser are by after the convergence of the first lens, being irradiated on spherical glass substrate, and pass through spherical glass
Substrate, vertical irradiation to the upper surface of micro- metal column each described so that excited at the lower surface edge of micro- metal column
Ion bulk wave, each described lower surface concentrates on the centre of sphere near zone so that the plasma wave is attached in the centre of sphere
Near field is assembled to form exciting field；
Step 4, the sample are excited Raman diffused light in the exciting field, and the Raman diffused light is through second lens
Collect and converge on the detector, received by the detector.
6. Raman scattering exciting method according to claim 5, it is characterised in that：
Wherein, the sample is the liquid of gas or low concentration.
7. Raman scattering exciting method according to claim 5, it is characterised in that：
Wherein, the sample is housed inside in transparent accommodating chamber, and the scope of the transparent accommodating chamber is around near the centre of sphere
The surrounding in region.
8. a kind of Raman detector, it is characterised in that including：
The light source of incident laser is provided；
Raman scattering excitation apparatus for exciting Raman diffused light in sample, the Raman scattering excitation apparatus are claim
Raman scattering excitation apparatus in 1 to claim 4 described in any one；And
The spectroanalysis instrument being connected with the Raman scattering excitation apparatus, the phase for measuring different wavelengths of light in Raman diffused light
To intensity obtaining Raman spectrum.
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| CN201410461244.XA CN104792763B (en) | 2014-09-11 | 2014-09-11 | Raman scattering exciting method and device |
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| CN201410461244.XA CN104792763B (en) | 2014-09-11 | 2014-09-11 | Raman scattering exciting method and device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102243175A (en) * | 2011-06-21 | 2011-11-16 | 北京航空航天大学 | Surface plasma resonance light detection device based on ellipsoidal reflector light collection structure |
| CN102556952A (en) * | 2012-02-14 | 2012-07-11 | 中国人民解放军国防科学技术大学 | Metal cup-cylinder composite nano structure array and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010053521A1 (en) * | 1999-09-27 | 2001-12-20 | Kreimer David I. | Amplification of analyte detection by substrates having particle structures with receptors |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243175A (en) * | 2011-06-21 | 2011-11-16 | 北京航空航天大学 | Surface plasma resonance light detection device based on ellipsoidal reflector light collection structure |
| CN102556952A (en) * | 2012-02-14 | 2012-07-11 | 中国人民解放军国防科学技术大学 | Metal cup-cylinder composite nano structure array and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| Near-field focusing of the dielectric microsphere with wavelength scale radius;Hanming Guo 等;《OPTICS EXPRESS》;20130128;第21卷(第2期);第2434-2443页 * |
| 纳米 Ag 材料表面等离子体激元引起的表面增强拉曼散射光谱研究;黄茜 等;《物理学报》;20090331;第58卷(第3期);第1980-1986页 * |
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Effective date of registration: 20160216 Address after: 200093, 031, No. 1076 military road, Shanghai, Yangpu District, B68 Applicant after: Shanghai star Photoelectric Technology Co., Ltd. Address before: 200093, room 210-10, building A, building 128, No. 11 Xiang Yin Road, Shanghai, Yangpu District Applicant before: SHANGHAI JIANPU PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |
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