CN202886284U - Holographic tip-enhanced Raman spectrometer optical system - Google Patents
Holographic tip-enhanced Raman spectrometer optical system Download PDFInfo
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- CN202886284U CN202886284U CN 201220582166 CN201220582166U CN202886284U CN 202886284 U CN202886284 U CN 202886284U CN 201220582166 CN201220582166 CN 201220582166 CN 201220582166 U CN201220582166 U CN 201220582166U CN 202886284 U CN202886284 U CN 202886284U
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Abstract
The utility model relates to a Raman spectrometer, particularly a holographic tip-enhanced Raman spectrometer optical system. The holographic tip-enhanced Raman spectrometer optical system is provided with a laser device, a beam splitter prism assembly, an edge filter, a high-NA-value lens, a sample objective table and a Raman signal acquisition lens, wherein the beam splitter prism assembly is used for splitting one laser beam emitted by a laser device into two parallel exciting light beams; the beam splitter prism assembly is provided with a cubic prism and a triangular prism; the edge filter is arranged in front of the beam splitter prism assembly and enables the two laser beams to enter the Raman signal acquisition lens at a 45-degree angle; the high-NA-value lens is used for gathering the two exciting light beams reflected by the edge filter into a tip tail end focus point; and the Raman signal acquisition lens is used for transmitting acquired Raman signals to a spectrometer and detector to carry out light splitting and detection. The system is simple and convenient to operate. In practical application, two modes (upward and inverted modes) can be designed according to different detection objects.
Description
Technical field
The utility model relates to Raman spectrometer, especially relates to a kind of holographic Tip-Enhanced Raman Spectroscopy instrument optical system.
Background technology
No matter conventional Raman spectrum or Surface enhanced raman spectroscopy, its spatial resolution all can't break through optical diffraction limit, thereby there is great limitation in the object of research.
It is found that in recent years, adopt " Tip-Enhanced Raman Spectroscopy technology " can reach tens nanometers to spatial resolution and the monomolecular detection sensitivity of the breakthrough optical diffraction limit of several Nano grades.Under normal pressure and air conditions, Tip-Enhanced Raman Spectroscopy technology (hereinafter referred to as TERS) be at present unique can be in the surface and interface optical characterisation technology of several nanometers to tens nanoscale sampling chemical analysis information.Therefore, no matter commercial Application, or basic scientific research all has very large demand to " Tip-Enhanced Raman Spectroscopy instrument ", is the study hotspot in present Raman spectrum field to development, the Application and Development of TERS instrument.Optical system is that the main of TERS also is important ingredient.
The basic functional principle of TERS is: utilize scanning probe microscopy that gold or silver-colored needle point are approached substrate, under the Ear Mucosa Treated by He Ne Laser Irradiation of suitable wavelength and polarization, tip end is because surface plasmon resonance effect produces the electromagnetic field that strengthens, and the Raman signal that therefore is positioned at needle point below sample is enhanced.TERS has high sensitivity and spatial resolution, and can obtain simultaneously pattern and the chemical information of sample surfaces.Only need adopt the laser power of milliwatt level to get final product, therefore be paid attention to widely.
At present, more international renowned companies, such as NT-MDT, Renishaw and Nanonics have released business-like TERS instrument.The independent intellectual property rightization of TERS instrument also is seen in application, such as US Patent No. 2002/0154301, patent US2010/0245816; The acquired Chinese patent 201110354369.9 of Chinese patent CN101082585A and applicant.
A common feature of above TERS instrument is that its optical system substantially all is to be based upon on the basis of the burnt microtechnic of copolymerization.This is so that the instrumentation difficulty is large, and cost is high.The high-caliber research work of delivering in the world up to now substantially all is that the instrument of developing voluntarily in the laboratory obtains, and rarely has at commercial TERS instrument to obtain high-caliber achievement in research.
Summary of the invention
The purpose of this utility model is to provide a kind of holographic Tip-Enhanced Raman Spectroscopy instrument optical system.
The utility model is provided with:
A laser instrument, described laser instrument is used for the Raman signal of excited sample, as system's excitation source;
An Amici prism group, described Amici prism group are used for the beam of laser bundle that laser instrument sends is divided into the excitation beam that two bundles run parallel, and described Amici prism group is provided with block prism and triangular prism, and described Amici prism is mounted on laser instrument the place ahead;
An edge filter sheet, described edge filter sheet is used for two of reflection beam splitting prism composition and restraints the excitation beam that runs parallel, and on the Raman collection light path the exciting and the noises such as sample light, Rayleigh scattering of filtering reflection, described edge filter sheet is located at Amici prism group the place ahead, two bundle laser is incident in Raman signal with 45° angle gathers lens;
High NA value lens, described high NA value lens are used for two bundle excitation beams of edge filter sheet reflection are converged at a tip end focus point;
A sample stage, described sample stage are used for placing testing sample;
A Raman signal gathers lens, and the Raman signal that described Raman signal collection lens are used for gathering is transported to spectrometer and detecting device carries out light splitting and detection.
Described laser instrument can adopt LD laser instrument or gas laser etc.
Described edge filter sheet can adopt long pass filter sheet or notch filter sheet etc.
The utlity model has following outstanding advantages:
1, the emitting laser bundle becomes two to restraint the light beam that runs parallel by the prism component, and two light beams are realized assembling through the high-NA camera lens.Obviously, this is a kind of new holographic register system.This system is simple, easy to operate.In actual applications, can design for different detected objects and just putting and be inverted two kinds of patterns.
2, twin-beam excites when having avoided needle point and spot coupling owing to the reflection of needle tip bracket (for example semi-girder of afm tip) to exciting light Gauss center, greatly improved the launching efficiency of laser, and reduce the ground unrest that thus reflection causes, Raman spectrum is collected and signal is processed thereby effectively improve.
3, compact optical system is conducive to TERS instrument miniaturization and practical.Above characteristics make the utility model and patent US2002/0154301, and US2010/0245816, CN101082585A compare has unique superior and innovation.
4, the utility model is different from the product of having reported at present, and the utility model adopts the twin-beam focusing system, so claim holographic TERS optical system.With respect to the TERS instrument system of having reported at present convenient easy-to-use, can in actual production, research, obtain important application.
Description of drawings
Fig. 1 is the structural representation of the utility model positively fixed type optical system.
Fig. 2 is the structural representation of the utility model inversion type optical system.
In Fig. 1 and 2, respectively be labeled as: the 1st, laser instrument, the 2nd, block prism, the 3rd, triangular prism, the 4th, edge filter sheet, the 5th, high NA value lens, the 6th, needle point, the 7th, sample stage, the 8th, Raman signal gathers lens, and the 9th, raman spectroscopic system, the 10th, focused light is at the enlarged drawing of tip end.
Embodiment
Referring to Fig. 1 and 2, Fig. 1 provides the structural representation of the utility model positively fixed type optical system, and Fig. 2 provides the structural representation of the utility model inversion type optical system.
The utility model embodiment is provided with:
A laser instrument 1, described laser instrument 1 is used for the Raman signal of excited sample, as system's excitation source;
An Amici prism group, described Amici prism group are used for the beam of laser bundle that laser instrument sends is divided into the excitation beam that two bundles run parallel, and described Amici prism group is provided with block prism 2 and triangular prism 3, and described Amici prism is mounted on laser instrument 1 the place ahead;
An edge filter sheet 4, described edge filter sheet 4 is used for two of reflection beam splitting prism composition and restraints the excitation beam that runs parallel, and on the Raman collection light path the exciting and the noises such as sample light, Rayleigh scattering of filtering reflection, described edge filter sheet 4 is located at Amici prism group the place ahead, two bundle laser is incident in Raman signal with 45° angle gathers lens 8;
High NA value lens 5, described high NA value lens 5 are used for two bundle excitation beams of edge filter sheet 4 reflections are converged at a needle point 6 terminal focus points;
A sample stage 7, described sample stage 7 is used for placing testing sample;
Raman signal gathers lens 8, and described Raman signal gathers Raman signal that lens 8 are used for gathering and is transported to raman spectroscopic system 9(and comprises spectrometer and detecting device) carry out light splitting and detection.
Described laser instrument 1 can adopt LD laser instrument or gas laser etc.
Described edge filter sheet 4 can adopt long pass filter sheet or notch filter sheet etc.
In Fig. 1, adopt the positively fixed type structure, namely testing sample is opaque, and needle point 6 inserts from the two light beams angle, and light beam can drop on needle point 6 ends by focus point.
In Fig. 2, adopt the inversion type structure, namely testing sample is the transparent body, needle point 6 ends are positioned at twin-beam can focus point.
Claims (3)
1. holographic Tip-Enhanced Raman Spectroscopy instrument optical system is characterized in that being provided with:
A laser instrument, described laser instrument is used for the Raman signal of excited sample, as system's excitation source;
An Amici prism group, described Amici prism group are used for the beam of laser bundle that laser instrument sends is divided into the excitation beam that two bundles run parallel, and described Amici prism group is provided with block prism and triangular prism, and described Amici prism is mounted on laser instrument the place ahead;
An edge filter sheet, described edge filter sheet is used for two of reflection beam splitting prism composition and restraints the excitation beam that runs parallel, and on the Raman collection light path the exciting and the noises such as sample light, Rayleigh scattering of filtering reflection, described edge filter sheet is located at Amici prism group the place ahead, two bundle laser is incident in Raman signal with 45° angle gathers lens;
High NA value lens, described high NA value lens are used for two bundle excitation beams of edge filter sheet reflection are converged at a tip end focus point;
A sample stage, described sample stage are used for placing testing sample;
A Raman signal gathers lens, and the Raman signal that described Raman signal collection lens are used for gathering is transported to spectrometer and detecting device carries out light splitting and detection.
2. a kind of holographic Tip-Enhanced Raman Spectroscopy instrument optical system as claimed in claim 1 is characterized in that described laser instrument adopts LD laser instrument or gas laser.
3. a kind of holographic Tip-Enhanced Raman Spectroscopy instrument optical system as claimed in claim 1 is characterized in that described edge filter sheet adopts long pass filter sheet or notch filter sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220582166 CN202886284U (en) | 2012-11-07 | 2012-11-07 | Holographic tip-enhanced Raman spectrometer optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220582166 CN202886284U (en) | 2012-11-07 | 2012-11-07 | Holographic tip-enhanced Raman spectrometer optical system |
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| Publication Number | Publication Date |
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| CN202886284U true CN202886284U (en) | 2013-04-17 |
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| CN 201220582166 Withdrawn - After Issue CN202886284U (en) | 2012-11-07 | 2012-11-07 | Holographic tip-enhanced Raman spectrometer optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928397A (en) * | 2012-11-07 | 2013-02-13 | 厦门大学 | Optical system of holographic needlepoint enhanced Raman spectrometer |
| CN109425592A (en) * | 2017-08-31 | 2019-03-05 | 清华大学 | A kind of observation device of monodimension nanometer material |
-
2012
- 2012-11-07 CN CN 201220582166 patent/CN202886284U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928397A (en) * | 2012-11-07 | 2013-02-13 | 厦门大学 | Optical system of holographic needlepoint enhanced Raman spectrometer |
| CN102928397B (en) * | 2012-11-07 | 2015-11-04 | 厦门大学 | Holographic Tip-Enhanced Raman Spectroscopy instrument optical system |
| CN109425592A (en) * | 2017-08-31 | 2019-03-05 | 清华大学 | A kind of observation device of monodimension nanometer material |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130417 Effective date of abandoning: 20151104 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |