CN111765973B - Laser polarization direction detection device and detection method based on graphene nanoribbon array grating - Google Patents
Laser polarization direction detection device and detection method based on graphene nanoribbon array grating Download PDFInfo
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- CN111765973B CN111765973B CN202010465175.5A CN202010465175A CN111765973B CN 111765973 B CN111765973 B CN 111765973B CN 202010465175 A CN202010465175 A CN 202010465175A CN 111765973 B CN111765973 B CN 111765973B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 36
- 239000002074 nanoribbon Substances 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 230000010287 polarization Effects 0.000 title claims abstract description 27
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 38
- 230000001360 synchronised effect Effects 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 239000002127 nanobelt Substances 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims 1
- 239000010439 graphite Substances 0.000 claims 1
- -1 graphite alkene Chemical class 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 6
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 239000002086 nanomaterial Substances 0.000 abstract description 2
- 238000002834 transmittance Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003841 Raman measurement Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000023004 detection of visible light Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
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Abstract
The invention relates to the technical field of nano materials and optics, in particular to a laser polarization direction detection device based on a graphene nanoribbon array grating, which comprises a front plate and a rear plate, wherein the front plate and the rear plate are connected by an upper arc plate and a lower arc plate; the center position of the front plate is provided with a grating rotating table, and the center position of the grating rotating table is provided with a grating; a synchronous rotating table is arranged at the central position of the rear plate and is connected with the grating rotating table on the front plate through two rotating synchronous rods; a Raman backscattering signal collecting surface is arranged on the synchronous rotating table, and a laser incident port is arranged at the center of the Raman backscattering signal collecting surface; the invention can detect the laser with any wavelength and has wide application range; when in use, the laser light path is not changed, and the use is convenient; the in-situ detection can be carried out in real time under the working state of an optical path, and can be integrated in a required instrument to be used as a detection tool.
Description
Technical Field
The invention relates to the technical field of nano materials and optics, in particular to a laser polarization direction detection device based on a graphene nanoribbon array grating.
Background
Polarized light has wide application in physical and chemical research, and various methods and devices for detecting the polarization direction of light have great limitations at present, for example, a testing device consisting of an analyzer and a quarter-wave plate can only be used for qualitative detection of visible light by observing the intensity change of incident light with naked eyes; if measure laser stokes parameter detection polarization, not only use comparatively complicatedly, can't accomplish to carry out the normal position detection under the laser operating condition moreover, and in the experiment, carry out real-time normal position detection to laser and can promote experimental efficiency greatly to guarantee that the testing result does not receive other factor interference.
Disclosure of Invention
In order to overcome the above disadvantages, the present invention provides a laser polarization direction detection device based on a graphene nanoribbon array grating, which can detect the polarization direction of light in situ in real time, and mainly solves the problem through the following technical means.
A laser polarization direction detection device based on a graphene nanoribbon array grating comprises a front plate and a rear plate, wherein the front plate and the rear plate are connected by an upper arc plate and a lower arc plate; the center position of the front plate is provided with a grating rotating table, and the center position of the grating rotating table is provided with a grating; a synchronous rotating table is arranged at the central position of the rear plate and is connected with the grating rotating table on the front plate through two rotating synchronous rods; the synchronous rotating platform is provided with a Raman backscattering signal collecting surface, and the center of the Raman backscattering signal collecting surface is provided with a laser incident port.
A laser polarization direction detection method based on a graphene nanoribbon array grating comprises the following steps:
step 1: preparing an atomic-level accurate graphene nanoribbon array by a bottom-up method by taking a clean Au (111) adjacent single crystal step surface as a substrate;
step 2: transferring the prepared graphene nanoribbon array to a transparent substrate to prepare a grating;
and step 3: calibrating a y axis and an x axis of the grating by adopting a polarized Raman scattering spectrum;
and 4, step 4: installing the grating on a grating rotating table of a detection device, wherein the y axis is parallel to a signal acquisition strip, the grating can rotate on the device, and the signal acquisition strip and the grating synchronously rotate through a synchronous rotating rod;
and 5: the detection device is arranged in the light path, and the incident laser penetrates through the incident hole and irradiates on the grating;
step 6: the rotating grating detects the Raman backscattering intensity at different angles, and the strongest intensity is the y-axis direction which is the polarization direction.
Preferably, in the step (1), the Au substrate is a crystal plane of a single crystal having a close step with a crystal plane index in the vicinity of (111).
Preferably, in the step (1), a bottom-up method is adopted to grow the graphene nanoribbon array.
Preferably, the grating constant d is in the nanometer range and much smaller than the wavelength of the laser light when detecting the raman backscattered signal, so that the raman scattered light is concentrated.
Preferably, the optical signal structure area is distributed into a small area, and the small area is parallel to the y axis of the grating and rotates synchronously with the grating, so that the device cost is reduced.
Preferably, the raman scattering intensity is maximum when the grating y-axis is parallel to the incident laser polarization direction.
The invention has the beneficial effects that: the invention can detect the laser with any wavelength and has wide application range; when in use, the laser light path is not changed, and the use is convenient; the in-situ detection can be carried out in real time under the working state of an optical path, and can be integrated in a required instrument to be used as a detection tool.
Drawings
FIG. 1 is a schematic view of the structure of the detecting device.
FIG. 2 is a schematic diagram of a grating preparation process and apparatus operation.
Fig. 3 is a graph of intensity polarization of polarized raman light of a graphene nanoribbon array.
FIG. 4 is a graph of the diffraction intensity distribution on the x-axis.
Detailed Description
In order to facilitate the understanding of those skilled in the art, the present invention will be further described with reference to specific embodiments, which are not intended to limit the present invention.
The first embodiment is as follows: a laser polarization direction detection device based on a graphene nanoribbon array grating comprises a front plate 7 and a rear plate 8, wherein the front plate 7 and the rear plate 8 are connected by an upper arc plate 9 and a lower arc plate 9; the center position of the front plate 7 is provided with a grating rotating platform 1, and the center position of the grating rotating platform 1 is provided with a grating 2; a synchronous rotating platform 5 is arranged at the central position of the rear plate 8, and the synchronous rotating platform 5 is connected with the grating rotating platform 1 on the front plate 7 through two rotating synchronous rods 6; the synchronous rotating platform 5 is provided with a Raman backscattering signal collecting surface 3, and a laser incident port 4 is arranged at the center of the Raman backscattering signal collecting surface 3.
Example two: a laser polarization direction detection method based on a graphene nanoribbon array grating comprises the following steps:
step 1: preparing an atomic-level accurate graphene nanoribbon array by a bottom-up method by taking a clean Au (111) adjacent single crystal step surface as a substrate;
step 2: transferring the prepared graphene nanoribbon array to a transparent substrate to prepare a grating;
and step 3: calibrating a y axis and an x axis of the grating by adopting a polarized Raman scattering spectrum;
and 4, step 4: installing the grating on a grating rotating table of a detection device, wherein the y axis is parallel to a signal acquisition strip, the grating rotates on the device, and the signal acquisition strip synchronously rotates with the grating through a synchronous rotating rod;
and 5: the detection device is arranged in the light path, and the incident laser penetrates through the incident hole and irradiates on the grating;
step 6: the rotating grating detects the Raman backscattering intensity at different angles, and the strongest intensity is the y-axis direction which is the polarization direction.
For better illustration, the direction perpendicular to the growth direction of the graphene nanoribbon array in the plane of the grating is named y-axis, and perpendicular to the y-axis is the x-axis.
In an ultrahigh vacuum environment, DBBA is selected as a precursor, and an N =7 armchair type graphene nanoribbon array is epitaxially grown on a clean Au (111112) step surface.
And transferring the graphene nanoribbon array to a PMMA substrate to prepare the grating 2.
Calibrating the y axis and the x axis of the grating by polarization Raman measurement, irradiating the grating 2 with polarization laser with the wavelength of 532nm at different angles, detecting the Raman scattering intensity, wherein the signal intensity of the polarization light with different angles is shown in figure 3, and calibrating the angle with the strongest Raman intensity as the y axis and the angle perpendicular to the y axis as the x axis.
The reticle 2 is attached to the apparatus and freely rotated by the reticle rotation stage 1.
The width of the N =7 armchair-type graphene nanoribbon is 0.73 nm, and the nanoribbon spacing in an array grown on Au (111112) is about 1 nm, that is, a =0.73 nm and d =1 nm of a grating prepared by the graphene nanoribbon array; according to the diffraction intensity distribution formula, an intensity distribution curve on an x axis is obtained and is shown in FIG. 4; it can be seen that all the light intensity on the x-axis is concentrated on
In the angle of (c).
All peaks in raman scattering of graphene nanoribbon arraysHave a significant polarization effect. In theory, the intensity of raman scattered light of the graphene nanoribbon array and cos2Theta is proportional, wherein the polarization direction of the laser is parallel to the growth direction of the nanobelts when theta =0, so that the polarization direction of the incident light can be detected by detecting the intensity of raman scattered light of the nanobelt array.
The single-layer graphene has the characteristic of high transmittance, the single-layer graphene nanoribbon also has high transmittance, and after the graphene nanoribbon array is transferred to a transparent substrate to prepare the grating, the whole grating still has good transmittance; only a small amount of laser participates in Raman scattering of the graphene nanoribbon, so that the influence of the added grating on the use of an original optical path is small, and meanwhile, the detection device can perform real-time in-situ detection in a laser working state.
And the back scattering Raman signals of the graphene nanoribbon array are collected, so that the influence of the transmission light and Rayleigh scattering on the Raman signals can be greatly reduced.
The graphene nanoribbon array has regular gaps, when the Raman scattering light of the graphene nanoribbon is collected, the graphene nanoribbon is equivalent to a slit in a grating, the distance between the graphene nanoribbons is a grating constant d, the width of the graphene nanoribbon is a slit width a, and the intensity distribution formula of the diffraction grating is as follows:
wherein D is the diffraction factor:
i is the interference factor:
n is the number of participating gratings, the width and the spacing of the graphene nanoribbons prepared by the bottom-up method are both in the nanometer level, namely for common laser, the grating constant d and the slit width a are both far smaller than the wavelength of scattered light; at this time, the intensity distribution of the scattered light on the x-axis is concentrated on a narrow 0-order bright stripe, and therefore, the optical signal collecting sensor installed in one small stripe region rotating in synchronization with the y-axis near the x-axis θ =0 can collect almost all raman scattered signals.
The Raman scattering signal is much weaker than the original laser signal, so that the device uses a photomultiplier target surface as an optical signal sensor, the target surface is a long and narrow rectangle, the long direction is parallel to the y axis and rotates synchronously, the short direction is along the x axis and is positioned at
Nearby, because all the light intensity on the x-axis is concentrated and distributed
The target surface is enough to collect all Raman scattering signals, and the cost is reduced.
In the using process of the device, incident light is absorbed through the laser incident port 4 and irradiates the grating 2, and the grating 2 has good light transmission and small interference to laser, so that the use of an original light path is not influenced; at this time, the photoelectric sensing of the rotating grating 2 expects that the backscattering raman signal intensity is observed, and when the intensity is maximum, the grating y axis is the polarization direction of the incident laser.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the concept and the protection scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the concept of the present invention shall fall within the protection scope of the present invention.
Claims (5)
1. The utility model provides a laser polarization direction detection device based on graphite alkene nanobelt array grating which characterized in that: the device comprises a front plate and a rear plate, wherein the front plate and the rear plate are connected by an upper arc plate and a lower arc plate; the center position of the front plate is provided with a grating rotating table, and the center position of the grating rotating table is provided with a grating; a synchronous rotating table is arranged at the central position of the rear plate and is connected with the grating rotating table on the front plate through two synchronous rotating rods; a Raman backscattering signal collecting surface is arranged on the synchronous rotating table, and a laser incident port is arranged at the center of the Raman backscattering signal collecting surface; incident laser penetrates through the incident port and irradiates on the grating, and signals are collected by the Raman back scattering signal collection surface.
2. The detection method of the laser polarization direction detection device based on the graphene nanoribbon array grating of claim 1 is characterized by comprising the following steps:
step 1: preparing an atomic-level accurate graphene nanoribbon array by a bottom-up method by taking a clean Au (111) adjacent single crystal step surface as a substrate;
step 2: transferring the prepared graphene nanoribbon array to a transparent substrate to prepare a grating;
and step 3: calibrating a y axis and an x axis of the grating by adopting a polarized Raman scattering spectrum;
and 4, step 4: installing the grating on a grating rotating table of a detection device, wherein the y axis is parallel to a Raman backscattering signal collecting surface, the grating rotates on the device, and the Raman backscattering signal collecting surface synchronously rotates with the grating through a synchronous rotating rod;
and 5: the detection device is arranged in the light path, and incident laser passes through the incident port and irradiates on the grating;
step 6: the rotating grating detects the Raman backscattering intensity at different angles, and the strongest intensity is the y-axis direction which is the polarization direction.
3. The detection method according to claim 2, characterized in that: when detecting Raman backscattering, the grating constant d is in nanometer level and far smaller than the laser wavelength, so that the Raman backscattering is concentrated.
4. The detection method according to claim 2, characterized in that: the Raman backscattering signal collecting surface is distributed in a small area, and the area is parallel to the y axis of the grating and rotates synchronously with the grating, so that the cost of the device is reduced.
5. The detection method according to claim 2, characterized in that: the raman backscattering intensity is maximum when the grating y-axis is parallel to the incident laser polarization direction.
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| US6975397B2 (en) * | 2003-02-27 | 2005-12-13 | Biotools, Inc. | Polarization state conversion in optically active spectroscopy |
| CN101852614B (en) * | 2010-06-10 | 2012-07-04 | 大连理工大学 | Miniature polarized light detecting device of navigation sensor |
| JP2013007830A (en) * | 2011-06-23 | 2013-01-10 | Seiko Epson Corp | Transmissive diffraction grating and detecting device |
| CN106324729B (en) * | 2016-09-23 | 2021-05-11 | 苏州六三二八光电科技有限公司 | Laser holographic graphene-based metal composite surface Raman enhanced substrate processing method |
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